mcs/class/System.Data/System.Data/DataSet.cs

   1 //
   2 // System.Data/DataSet.cs
   3 //
   4 // Author:
   5 //   Christopher Podurgiel <cpodurgiel@msn.com>
   6 //   Daniel Morgan <danmorg@sc.rr.com>
   7 //   Rodrigo Moya <rodrigo@ximian.com>
   8 //   Stuart Caborn <stuart.caborn@virgin.net>
   9 //   Tim Coleman (tim@timcoleman.com)
  10 //   Ville Palo <vi64pa@koti.soon.fi>
  11 //   Atsushi Enomoto <atsushi@ximian.com>
  12 //
  13 // (C) Ximian, Inc. 2002
  14 // Copyright (C) Tim Coleman, 2002, 2003
  15 //
  16
  17 using System;
  18 using System.Collections;
  19 using System.ComponentModel;
  20 using System.Globalization;
  21 using System.Threading;
  22 using System.IO;
  23 using System.Runtime.Serialization;
  24 using System.Xml;
  25 using System.Xml.Schema;
  26 using System.Xml.Serialization;
  27 using System.Data.Common;
  28
  29 namespace System.Data {
  30
  31         [ToolboxItem (false)]
  32         [DefaultProperty ("DataSetName")]
  33         [Serializable]
  34         public class DataSet : MarshalByValueComponent, IListSource,
  35                 ISupportInitialize, ISerializable, IXmlSerializable
  36         {
  37                 private string dataSetName;
  38                 private string _namespace = "";
  39                 private string prefix;
  40                 private bool caseSensitive;
  41                 private bool enforceConstraints = true;
  42                 private DataTableCollection tableCollection;
  43                 private DataRelationCollection relationCollection;
  44                 private PropertyCollection properties;
  45                 private DataViewManager defaultView;
  46                 private CultureInfo locale = System.Threading.Thread.CurrentThread.CurrentCulture;
  47                 internal XmlDataDocument _xmlDataDocument = null;
  48
  49                 #region Constructors
  50
  51                 public DataSet () : this ("NewDataSet")
  52                 {
  53                 }
  54
  55                 public DataSet (string name)
  56                 {
  57                         dataSetName = name;
  58                         tableCollection = new DataTableCollection (this);
  59                         relationCollection = new DataRelationCollection.DataSetRelationCollection (this);
  60                         properties = new PropertyCollection ();
  61                         this.prefix = String.Empty;
  62
  63                         this.Locale = CultureInfo.CurrentCulture;
  64                 }
  65
  66                 protected DataSet (SerializationInfo info, StreamingContext context) : this ()
  67                 {
  68                         GetSerializationData (info, context);
  69                 }
  70
  71                 #endregion // Constructors
  72
  73                 #region Public Properties
  74
  75                 [DataCategory ("Data")]
  76                 [DataSysDescription ("Indicates whether comparing strings within the DataSet is case sensitive.")]
  77                 [DefaultValue (false)]
  78                 public bool CaseSensitive {
  79                         get {
  80                                 return caseSensitive;
  81                         }
  82                         set {
  83                                 caseSensitive = value;
  84                                 if (!caseSensitive) {
  85                                         foreach (DataTable table in Tables) {
  86                                                 foreach (Constraint c in table.Constraints)
  87                                                         c.AssertConstraint ();
  88                                         }
  89                                 }
  90                         }
  91                 }
  92
  93                 [DataCategory ("Data")]
  94                 [DataSysDescription ("The name of this DataSet.")]
  95                 [DefaultValue ("")]
  96                 public string DataSetName {
  97                         get { return dataSetName; }
  98                         set { dataSetName = value; }
  99                 }
 100
 101                 [DataSysDescription ("Indicates a custom \"view\" of the data contained by the DataSet. This view allows filtering, searching, and navigating through the custom data view.")]
 102                 [Browsable (false)]
 103                 public DataViewManager DefaultViewManager {
 104                         get {
 105                                 if (defaultView == null)
 106                                         defaultView = new DataViewManager (this);
 107                                 return defaultView;
 108                         }
 109                 }
 110
 111                 [DataSysDescription ("Indicates whether constraint rules are to be followed.")]
 112                 [DefaultValue (true)]
 113                 public bool EnforceConstraints {
 114                         get { return enforceConstraints; }
 115                         set {
 116                                 if (value != enforceConstraints) {
 117                                         enforceConstraints = value;
 118                                         if (value) {
 119                                                 foreach (DataTable table in Tables) {
 120                                                         // first assert all unique constraints
 121                                                         foreach (UniqueConstraint uc in table.Constraints.UniqueConstraints)
 122                                                                 uc.AssertConstraint ();
 123                                                         // then assert all foreign keys
 124                                                         foreach (ForeignKeyConstraint fk in table.Constraints.ForeignKeyConstraints)
 125                                                                 fk.AssertConstraint ();
 126                                                 }
 127                                         }
 128                                 }
 129                         }
 130                 }
 131
 132                 [Browsable (false)]
 133                 [DataCategory ("Data")]
 134                 [DataSysDescription ("The collection that holds custom user information.")]
 135                 public PropertyCollection ExtendedProperties {
 136                         get { return properties; }
 137                 }
 138
 139                 [Browsable (false)]
 140                 [DataSysDescription ("Indicates that the DataSet has errors.")]
 141                 public bool HasErrors {
 142                         [MonoTODO]
 143                         get {
 144                                 for (int i = 0; i < Tables.Count; i++) {
 145                                         if (Tables[i].HasErrors)
 146                                                 return true;
 147                                 }
 148                                 return false;
 149                         }
 150                 }
 151
 152                 [DataCategory ("Data")]
 153                 [DataSysDescription ("Indicates a locale under which to compare strings within the DataSet.")]
 154                 public CultureInfo Locale {
 155                         get {
 156                                 return locale;
 157                         }
 158                         set {
 159                                 if (locale == null || !locale.Equals (value)) {
 160                                         // TODO: check if the new locale is valid
 161                                         // TODO: update locale of all tables
 162                                         locale = value;
 163                                 }
 164                         }
 165                 }
 166
 167                 public void Merge (DataRow[] rows)
 168                 {
 169                         Merge (rows, false, MissingSchemaAction.Add);
 170                 }
 171
 172                 public void Merge (DataSet dataSet)
 173                 {
 174                         Merge (dataSet, false, MissingSchemaAction.Add);
 175                 }
 176
 177                 public void Merge (DataTable table)
 178                 {
 179                         Merge (table, false, MissingSchemaAction.Add);
 180                 }
 181
 182                 public void Merge (DataSet dataSet, bool preserveChanges)
 183                 {
 184                         Merge (dataSet, preserveChanges, MissingSchemaAction.Add);
 185                 }
 186
 187                 [MonoTODO]
 188                 public void Merge (DataRow[] rows, bool preserveChanges, MissingSchemaAction missingSchemaAction)
 189                 {
 190                         if (rows == null)
 191                                 throw new ArgumentNullException ("rows");
 192                         if (!IsLegalSchemaAction (missingSchemaAction))
 193                                 throw new ArgumentOutOfRangeException ("missingSchemaAction");
 194
 195                         MergeManager.Merge (this, rows, preserveChanges, missingSchemaAction);
 196                 }
 197
 198                 [MonoTODO]
 199                 public void Merge (DataSet dataSet, bool preserveChanges, MissingSchemaAction missingSchemaAction)
 200                 {
 201                         if (dataSet == null)
 202                                 throw new ArgumentNullException ("dataSet");
 203                         if (!IsLegalSchemaAction (missingSchemaAction))
 204                                 throw new ArgumentOutOfRangeException ("missingSchemaAction");
 205
 206                         MergeManager.Merge (this, dataSet, preserveChanges, missingSchemaAction);
 207                 }
 208
 209                 [MonoTODO]
 210                 public void Merge (DataTable table, bool preserveChanges, MissingSchemaAction missingSchemaAction)
 211                 {
 212                         if (table == null)
 213                                 throw new ArgumentNullException ("table");
 214                         if (!IsLegalSchemaAction (missingSchemaAction))
 215                                 throw new ArgumentOutOfRangeException ("missingSchemaAction");
 216
 217                         MergeManager.Merge (this, table, preserveChanges, missingSchemaAction);
 218                 }
 219
 220                 private static bool IsLegalSchemaAction (MissingSchemaAction missingSchemaAction)
 221                 {
 222                         if (missingSchemaAction == MissingSchemaAction.Add || missingSchemaAction == MissingSchemaAction.AddWithKey
 223                                 || missingSchemaAction == MissingSchemaAction.Error || missingSchemaAction == MissingSchemaAction.Ignore)
 224                                 return true;
 225                         return false;
 226                 }
 227
 228                 [DataCategory ("Data")]
 229                 [DataSysDescription ("Indicates the XML uri namespace for the root element pointed at by this DataSet.")]
 230                 [DefaultValue ("")]
 231                 public string Namespace {
 232                         get { return _namespace; }
 233                         set {
 234                                 //TODO - trigger an event if this happens?
 235                                 if (value == null)
 236                                         value = String.Empty;
 237                                  if (value != this._namespace)
 238                                         RaisePropertyChanging ("Namespace");
 239                                 _namespace = value;
 240                         }
 241                 }
 242
 243                 [DataCategory ("Data")]
 244                 [DataSysDescription ("Indicates the prefix of the namespace used for this DataSet.")]
 245                 [DefaultValue ("")]
 246                 public string Prefix {
 247                         get { return prefix; }
 248                         set {
 249                                 if (value == null)
 250                                         value = String.Empty;
 251                               // Prefix cannot contain any special characters other than '_' and ':'
 252                                for (int i = 0; i < value.Length; i++) {
 253                                        if (!(Char.IsLetterOrDigit (value [i])) && (value [i] != '_') && (value [i] != ':'))
 254                                                throw new DataException ("Prefix '" + value + "' is not valid, because it contains special characters.");
 255                                }
 256
 257
 258                                 if (value == null)
 259                                         value = string.Empty;
 260
 261                                 if (value != this.prefix)
 262                                         RaisePropertyChanging ("Prefix");
 263                                 prefix = value;
 264                         }
 265                 }
 266
 267                 [DataCategory ("Data")]
 268                 [DataSysDescription ("The collection that holds the relations for this DatSet.")]
 269                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 270                 public DataRelationCollection Relations {
 271                         get {
 272                                 return relationCollection;
 273                         }
 274                 }
 275
 276                 [Browsable (false)]
 277                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 278                 public override ISite Site {
 279                         [MonoTODO]
 280                         get {
 281                                 throw new NotImplementedException ();
 282                         }
 283
 284                         [MonoTODO]
 285                         set {
 286                                 throw new NotImplementedException ();
 287                         }
 288                 }
 289
 290                 [DataCategory ("Data")]
 291                 [DataSysDescription ("The collection that holds the tables for this DataSet.")]
 292                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 293                 public DataTableCollection Tables {
 294                         get { return tableCollection; }
 295                 }
 296
 297                 #endregion // Public Properties
 298
 299                 #region Public Methods
 300
 301                 [MonoTODO]
 302                 public void AcceptChanges ()
 303                 {
 304                         foreach (DataTable tempTable in tableCollection)
 305                                 tempTable.AcceptChanges ();
 306                 }
 307
 308                 public void Clear ()
 309                 {
 310                         if (_xmlDataDocument != null)
 311                                 throw new NotSupportedException ("Clear function on dataset and datatable is not supported on XmlDataDocument.");
 312                         for (int t = 0; t < tableCollection.Count; t++) {
 313                                 tableCollection[t].Clear ();
 314                         }
 315                 }
 316
 317                 public virtual DataSet Clone ()
 318                 {
 319                         DataSet Copy = new DataSet ();
 320                         CopyProperties (Copy);
 321
 322                         foreach (DataTable Table in Tables) {
 323                                 Copy.Tables.Add (Table.Clone ());
 324                         }
 325
 326                         //Copy Relationships between tables after existance of tables
 327                         //and setting properties correctly
 328                         CopyRelations (Copy);
 329
 330                         return Copy;
 331                 }
 332
 333                 // Copies both the structure and data for this DataSet.
 334                 public DataSet Copy ()
 335                 {
 336                         DataSet Copy = new DataSet ();
 337                         CopyProperties (Copy);
 338
 339                         // Copy DatSet's tables
 340                         foreach (DataTable Table in Tables)
 341                                 Copy.Tables.Add (Table.Copy ());
 342
 343                         //Copy Relationships between tables after existance of tables
 344                         //and setting properties correctly
 345                         CopyRelations (Copy);
 346
 347                         return Copy;
 348                 }
 349
 350                 private void CopyProperties (DataSet Copy)
 351                 {
 352                         Copy.CaseSensitive = CaseSensitive;
 353                         //Copy.Container = Container
 354                         Copy.DataSetName = DataSetName;
 355                         //Copy.DefaultViewManager
 356                         //Copy.DesignMode
 357                         Copy.EnforceConstraints = EnforceConstraints;
 358                         if(ExtendedProperties.Count > 0) {
 359                                 //  Cannot copy extended properties directly as the property does not have a set accessor
 360                 Array tgtArray = Array.CreateInstance( typeof (object), ExtendedProperties.Count);
 361                 ExtendedProperties.Keys.CopyTo (tgtArray, 0);
 362                 for (int i=0; i < ExtendedProperties.Count; i++)
 363                                         Copy.ExtendedProperties.Add (tgtArray.GetValue (i), ExtendedProperties[tgtArray.GetValue (i)]);
 364                         }
 365             Copy.Locale = Locale;
 366                         Copy.Namespace = Namespace;
 367                         Copy.Prefix = Prefix;
 368                         //Copy.Site = Site; // FIXME : Not sure of this.
 369
 370                 }
 371
 372
 373                 private void CopyRelations (DataSet Copy)
 374                 {
 375
 376                         //Creation of the relation contains some of the properties, and the constructor
 377                         //demands these values. instead changing the DataRelation constructor and behaviour the
 378                         //parameters are pre-configured and sent to the most general constructor
 379
 380                         foreach (DataRelation MyRelation in this.Relations) {
 381                                 string pTable = MyRelation.ParentTable.TableName;
 382                                 string cTable = MyRelation.ChildTable.TableName;
 383                                 DataColumn[] P_DC = new DataColumn[MyRelation.ParentColumns.Length];
 384                                 DataColumn[] C_DC = new DataColumn[MyRelation.ChildColumns.Length];
 385                                 int i = 0;
 386
 387                                 foreach (DataColumn DC in MyRelation.ParentColumns) {
 388                                         P_DC[i]=Copy.Tables[pTable].Columns[DC.ColumnName];
 389                                         i++;
 390                                 }
 391
 392                                 i = 0;
 393
 394                                 foreach (DataColumn DC in MyRelation.ChildColumns) {
 395                                         C_DC[i]=Copy.Tables[cTable].Columns[DC.ColumnName];
 396                                         i++;
 397                                 }
 398
 399                                 DataRelation cRel = new DataRelation (MyRelation.RelationName, P_DC, C_DC);
 400                                 //cRel.ChildColumns = MyRelation.ChildColumns;
 401                                 //cRel.ChildTable = MyRelation.ChildTable;
 402                                 //cRel.ExtendedProperties = cRel.ExtendedProperties;
 403                                 //cRel.Nested = MyRelation.Nested;
 404                                 //cRel.ParentColumns = MyRelation.ParentColumns;
 405                                 //cRel.ParentTable = MyRelation.ParentTable;
 406
 407                                 Copy.Relations.Add (cRel);
 408                         }
 409                 }
 410
 411
 412
 413
 414                 public DataSet GetChanges ()
 415                 {
 416                         return GetChanges (DataRowState.Added | DataRowState.Deleted | DataRowState.Modified);
 417                 }
 418
 419
 420                 public DataSet GetChanges (DataRowState rowStates)
 421                 {
 422                         if (!HasChanges (rowStates))
 423                                 return null;
 424
 425                         DataSet copySet = Clone ();
 426                         Hashtable addedRows = new Hashtable ();
 427
 428                         IEnumerator tableEnumerator = Tables.GetEnumerator ();
 429                         DataTable origTable;
 430                         DataTable copyTable;
 431                         while (tableEnumerator.MoveNext ()) {
 432                                 origTable = (DataTable)tableEnumerator.Current;
 433                                 copyTable = copySet.Tables[origTable.TableName];
 434
 435                                 // Look for relations that have this table as child
 436                                 IEnumerator relations = origTable.ParentRelations.GetEnumerator ();
 437
 438                                 IEnumerator rowEnumerator = origTable.Rows.GetEnumerator ();
 439                                 while (rowEnumerator.MoveNext ()) {
 440                                         DataRow row = (DataRow)rowEnumerator.Current;
 441
 442                                         if (row.IsRowChanged (rowStates))
 443                                                 AddChangedRow (addedRows, copySet, copyTable, relations, row);
 444                                 }
 445                         }
 446                         return copySet;
 447                 }
 448
 449                 void AddChangedRow (Hashtable addedRows, DataSet copySet, DataTable copyTable, IEnumerator relations, DataRow row)
 450                 {
 451                         if (addedRows.ContainsKey (row)) return;
 452
 453                         relations.Reset ();
 454                         while (relations.MoveNext ()) {
 455                                 DataRow parentRow = row.GetParentRow ((DataRelation) relations.Current);
 456                                 if (parentRow == null || addedRows.ContainsKey (parentRow)) continue;
 457                                 DataTable parentCopyTable = copySet.Tables [parentRow.Table.TableName];
 458                                 AddChangedRow (addedRows, copySet, parentCopyTable, parentRow.Table.ParentRelations.GetEnumerator (), parentRow);
 459                         }
 460
 461                         DataRow newRow = copyTable.NewRow ();
 462                         copyTable.Rows.Add (newRow);
 463                         row.CopyValuesToRow (newRow);
 464                         newRow.XmlRowID = row.XmlRowID;
 465                         addedRows.Add (row,row);
 466                 }
 467
 468 #if NET_2_0
 469                 [MonoTODO]
 470                 public DataTableReader GetDataReader (DataTable[] dataTables)
 471                 {
 472                         throw new NotImplementedException ();
 473                 }
 474
 475                 [MonoTODO]
 476                 public DataTableReader GetDataReader ()
 477                 {
 478                         throw new NotImplementedException ();
 479                 }
 480 #endif
 481
 482                 public string GetXml ()
 483                 {
 484                         StringWriter Writer = new StringWriter ();
 485                         WriteXml (Writer, XmlWriteMode.IgnoreSchema);
 486                         return Writer.ToString ();
 487                 }
 488
 489                 public string GetXmlSchema ()
 490                 {
 491                         StringWriter Writer = new StringWriter ();
 492                         WriteXmlSchema (Writer);
 493                         return Writer.ToString ();
 494                 }
 495
 496                 [MonoTODO]
 497                 public bool HasChanges ()
 498                 {
 499                         return HasChanges (DataRowState.Added | DataRowState.Deleted | DataRowState.Modified);
 500                 }
 501
 502                 [MonoTODO]
 503                 public bool HasChanges (DataRowState rowState)
 504                 {
 505                         if (((int)rowState & 0xffffffe0) != 0)
 506                                 throw new ArgumentOutOfRangeException ("rowState");
 507
 508                         DataTableCollection tableCollection = Tables;
 509                         DataTable table;
 510                         DataRowCollection rowCollection;
 511                         DataRow row;
 512
 513                         for (int i = 0; i < tableCollection.Count; i++) {
 514                                 table = tableCollection[i];
 515                                 rowCollection = table.Rows;
 516                                 for (int j = 0; j < rowCollection.Count; j++) {
 517                                         row = rowCollection[j];
 518                                         if ((row.RowState & rowState) != 0)
 519                                                 return true;
 520                                 }
 521                         }
 522
 523                         return false;
 524                 }
 525
 526                 [MonoTODO ("Consider ignored namespace array")]
 527                 public void InferXmlSchema (XmlReader reader, string[] nsArray)
 528                 {
 529                         if (reader == null)
 530                                 return;
 531
 532                         XmlDataLoader Loader = new XmlDataLoader (this);
 533                         Loader.LoadData (reader, XmlReadMode.InferSchema);
 534                 }
 535
 536                 public void InferXmlSchema (Stream stream, string[] nsArray)
 537                 {
 538                         InferXmlSchema (new XmlTextReader (stream), nsArray);
 539                 }
 540
 541                 public void InferXmlSchema (TextReader reader, string[] nsArray)
 542                 {
 543                         InferXmlSchema (new XmlTextReader (reader), nsArray);
 544                 }
 545
 546                 public void InferXmlSchema (string fileName, string[] nsArray)
 547                 {
 548                         XmlTextReader reader = new XmlTextReader (fileName);
 549                         try {
 550                                 InferXmlSchema (reader, nsArray);
 551                         } finally {
 552                                 reader.Close ();
 553                         }
 554                 }
 555
 556 #if NET_2_0
 557                 [MonoTODO]
 558                 public void Load (IDataReader reader, LoadOption loadOption, DataTable[] tables)
 559                 {
 560                         throw new NotImplementedException ();
 561                 }
 562
 563                 [MonoTODO]
 564                 public void Load (IDataReader reader, LoadOption loadOption, string[] tables)
 565                 {
 566                         throw new NotImplementedException ();
 567                 }
 568 #endif
 569
 570                 public virtual void RejectChanges ()
 571                 {
 572                         int i;
 573                         bool oldEnforceConstraints = this.EnforceConstraints;
 574                         this.EnforceConstraints = false;
 575
 576                         for (i = 0; i < this.Tables.Count;i++)
 577                                 this.Tables[i].RejectChanges ();
 578
 579                         this.EnforceConstraints = oldEnforceConstraints;
 580                 }
 581
 582                 public virtual void Reset ()
 583                 {
 584                         IEnumerator constraintEnumerator;
 585
 586                         // first we remove all ForeignKeyConstraints (if we will not do that
 587                         // we will get an exception when clearing the tables).
 588                         for (int i = 0; i < Tables.Count; i++) {
 589                                 ConstraintCollection cc = Tables[i].Constraints;
 590                                 for (int j = 0; j < cc.Count; j++) {
 591                                         if (cc[j] is ForeignKeyConstraint)
 592                                                 cc.Remove (cc[j]);
 593                                 }
 594                         }
 595
 596                         Clear ();
 597                         Relations.Clear ();
 598                         Tables.Clear ();
 599                 }
 600
 601                 public void WriteXml (Stream stream)
 602                 {
 603                         XmlTextWriter writer = new XmlTextWriter (stream, null);
 604                         writer.Formatting = Formatting.Indented;
 605                         WriteXml (writer);
 606                 }
 607
 608                 ///<summary>
 609                 /// Writes the current data for the DataSet to the specified file.
 610                 /// </summary>
 611                 /// <param name="filename">Fully qualified filename to write to</param>
 612                 public void WriteXml (string fileName)
 613                 {
 614                         XmlTextWriter writer = new XmlTextWriter (fileName, null);
 615                         writer.Formatting = Formatting.Indented;
 616                         writer.WriteStartDocument (true);
 617                         try {
 618                                 WriteXml (writer);
 619                         }
 620                         finally {
 621                                 writer.WriteEndDocument ();
 622                                 writer.Close ();
 623                         }
 624                 }
 625
 626                 public void WriteXml (TextWriter writer)
 627                 {
 628                         XmlTextWriter xwriter = new XmlTextWriter (writer);
 629                         xwriter.Formatting = Formatting.Indented;
 630                         WriteXml (xwriter);
 631                 }
 632
 633                 public void WriteXml (XmlWriter writer)
 634                 {
 635                         WriteXml (writer, XmlWriteMode.IgnoreSchema);
 636                 }
 637
 638                 public void WriteXml (string filename, XmlWriteMode mode)
 639                 {
 640                         XmlTextWriter writer = new XmlTextWriter (filename, null);
 641                         writer.Formatting = Formatting.Indented;
 642                         writer.WriteStartDocument (true);
 643
 644                         try {
 645                                 WriteXml (writer, mode);
 646                         }
 647                         finally {
 648                                 writer.WriteEndDocument ();
 649                                 writer.Close ();
 650                         }
 651                 }
 652
 653                 public void WriteXml (Stream stream, XmlWriteMode mode)
 654                 {
 655                         XmlTextWriter writer = new XmlTextWriter (stream, null);
 656                         writer.Formatting = Formatting.Indented;
 657                         WriteXml (writer, mode);
 658                 }
 659
 660                 public void WriteXml (TextWriter writer, XmlWriteMode mode)
 661                 {
 662                         XmlTextWriter xwriter = new XmlTextWriter (writer);
 663                         xwriter.Formatting = Formatting.Indented;
 664                         WriteXml (xwriter, mode);
 665                 }
 666
 667                 public void WriteXml (XmlWriter writer, XmlWriteMode mode)
 668                 {
 669                         if (mode == XmlWriteMode.DiffGram) {
 670                                 SetRowsID();
 671                                 WriteDiffGramElement(writer);
 672                         }
 673
 674                         // It should not write when there is no content to be written
 675                         bool shouldOutputContent = (mode != XmlWriteMode.DiffGram);\r
 676                         for (int n=0; n<tableCollection.Count && !shouldOutputContent; n++)\r
 677                                 shouldOutputContent = tableCollection [n].Rows.Count > 0;\r
 678
 679                         if (shouldOutputContent) {
 680                                 WriteStartElement (writer, mode, Namespace, Prefix, XmlConvert.EncodeName (DataSetName));
 681
 682                                 if (mode == XmlWriteMode.WriteSchema)
 683                                         DoWriteXmlSchema (writer);
 684
 685                                 WriteTables (writer, mode, Tables, DataRowVersion.Default);
 686                                 writer.WriteEndElement ();
 687                         }
 688
 689                         if (mode == XmlWriteMode.DiffGram) {
 690                                 if (HasChanges(DataRowState.Modified | DataRowState.Deleted)) {
 691
 692                                         DataSet beforeDS = GetChanges (DataRowState.Modified | DataRowState.Deleted);
 693                                         WriteStartElement (writer, XmlWriteMode.DiffGram, XmlConstants.DiffgrNamespace, XmlConstants.DiffgrPrefix, "before");
 694                                         WriteTables (writer, mode, beforeDS.Tables, DataRowVersion.Original);
 695                                         writer.WriteEndElement ();
 696                                 }
 697                         }
 698
 699                         if (mode == XmlWriteMode.DiffGram)
 700                                 writer.WriteEndElement (); // diffgr:diffgram
 701                 }
 702
 703                 public void WriteXmlSchema (Stream stream)
 704                 {
 705                         XmlTextWriter writer = new XmlTextWriter (stream, null );
 706                         writer.Formatting = Formatting.Indented;
 707                         WriteXmlSchema (writer);
 708                 }
 709
 710                 public void WriteXmlSchema (string fileName)
 711                 {
 712                         XmlTextWriter writer = new XmlTextWriter (fileName, null);
 713                         try {
 714                                 writer.Formatting = Formatting.Indented;
 715                                 writer.WriteStartDocument (true);
 716                                 WriteXmlSchema (writer);
 717                         } finally {
 718                                 writer.WriteEndDocument ();
 719                                 writer.Close ();
 720                         }
 721                 }
 722
 723                 public void WriteXmlSchema (TextWriter writer)
 724                 {
 725                         XmlTextWriter xwriter = new XmlTextWriter (writer);
 726                         try {
 727                                 xwriter.Formatting = Formatting.Indented;
 728 //                              xwriter.WriteStartDocument ();
 729                                 WriteXmlSchema (xwriter);
 730                         } finally {
 731 //                              xwriter.WriteEndDocument ();
 732                                 xwriter.Close ();
 733                         }
 734                 }
 735
 736                 public void WriteXmlSchema (XmlWriter writer)
 737                 {
 738                         //Create a skeleton doc and then write the schema
 739                         //proper which is common to the WriteXml method in schema mode
 740                         DoWriteXmlSchema (writer);
 741                 }
 742
 743                 public void ReadXmlSchema (Stream stream)
 744                 {
 745                         XmlReader reader = new XmlTextReader (stream, null);
 746                         ReadXmlSchema (reader);
 747                 }
 748
 749                 public void ReadXmlSchema (string str)
 750                 {
 751                         XmlReader reader = new XmlTextReader (str);
 752                         try {
 753                                 ReadXmlSchema (reader);
 754                         }
 755                         finally {
 756                                 reader.Close ();
 757                         }
 758                 }
 759
 760                 public void ReadXmlSchema (TextReader treader)
 761                 {
 762                         XmlReader reader = new XmlTextReader (treader);
 763                         ReadXmlSchema (reader);
 764                 }
 765
 766                 public void ReadXmlSchema (XmlReader reader)
 767                 {
 768 #if true
 769                         new XmlSchemaDataImporter (this, reader);
 770 #else
 771                         XmlSchemaMapper SchemaMapper = new XmlSchemaMapper (this);
 772                         SchemaMapper.Read (reader);
 773 #endif
 774                 }
 775
 776                 public XmlReadMode ReadXml (Stream stream)
 777                 {
 778                         return ReadXml (new XmlTextReader (stream));
 779                 }
 780
 781                 public XmlReadMode ReadXml (string str)
 782                 {
 783                         XmlTextReader reader = new XmlTextReader (str);
 784                         try {
 785                                 return ReadXml (reader);
 786                         }
 787                         finally {
 788                                 reader.Close ();
 789                         }
 790                 }
 791
 792                 public XmlReadMode ReadXml (TextReader reader)
 793                 {
 794                         return ReadXml (new XmlTextReader (reader));
 795                 }
 796
 797                 public XmlReadMode ReadXml (XmlReader r)
 798                 {
 799                         return ReadXml (r, XmlReadMode.Auto);
 800                 }
 801
 802                 public XmlReadMode ReadXml (Stream stream, XmlReadMode mode)
 803                 {
 804                         return ReadXml (new XmlTextReader (stream), mode);
 805                 }
 806
 807                 public XmlReadMode ReadXml (string str, XmlReadMode mode)
 808                 {
 809                         XmlTextReader reader = new XmlTextReader (str);
 810                         try {
 811                                 return ReadXml (reader, mode);
 812                         }
 813                         finally {
 814                                 reader.Close ();
 815                         }
 816                 }
 817
 818                 public XmlReadMode ReadXml (TextReader reader, XmlReadMode mode)
 819                 {
 820                         return ReadXml (new XmlTextReader (reader), mode);
 821                 }
 822
 823                 [MonoTODO]
 824                 public XmlReadMode ReadXml (XmlReader reader, XmlReadMode mode)
 825                 {
 826                         switch (reader.ReadState) {
 827                         case ReadState.EndOfFile:
 828                         case ReadState.Error:
 829                         case ReadState.Closed:
 830                                 return mode;
 831                         }
 832                         // Skip XML declaration and prolog
 833                         reader.MoveToContent();
 834                         if (reader.EOF)
 835                                 return mode;
 836
 837                         XmlReadMode Result = mode;
 838
 839                         // If diffgram, then read the first element as diffgram
 840                         if (reader.LocalName == "diffgram" && reader.NamespaceURI == XmlConstants.DiffgrNamespace) {
 841                                 switch (mode) {
 842                                 case XmlReadMode.Auto:
 843                                 case XmlReadMode.DiffGram:
 844                                         XmlDiffLoader DiffLoader = new XmlDiffLoader (this);
 845                                         DiffLoader.Load (reader);
 846                                         // (and leave rest of the reader as is)
 847                                         return  XmlReadMode.DiffGram;
 848                                 case XmlReadMode.Fragment:
 849                                         reader.Skip ();
 850                                         // (and continue to read)
 851                                         break;
 852                                 default:
 853                                         reader.Skip ();
 854                                         // (and leave rest of the reader as is)
 855                                         return mode;
 856                                 }
 857                         }
 858                         // If schema, then read the first element as schema
 859                         if (reader.LocalName == "schema" && reader.NamespaceURI == XmlSchema.Namespace) {
 860                                 switch (mode) {
 861                                 case XmlReadMode.IgnoreSchema:
 862                                 case XmlReadMode.InferSchema:
 863                                         reader.Skip ();
 864                                         // (and break up read)
 865                                         return mode;
 866                                 case XmlReadMode.Fragment:
 867                                         ReadXmlSchema (reader);
 868                                         // (and continue to read)
 869                                         break;
 870                                 case XmlReadMode.Auto:
 871                                         if (Tables.Count == 0) {
 872                                                 ReadXmlSchema (reader);
 873                                                 return XmlReadMode.ReadSchema;
 874                                         } else {
 875                                         // otherwise just ignore and return IgnoreSchema
 876                                                 reader.Skip ();
 877                                                 return XmlReadMode.IgnoreSchema;
 878                                         }
 879                                 default:
 880                                         ReadXmlSchema (reader);
 881                                         // (and leave rest of the reader as is)
 882                                         return mode; // When DiffGram, return DiffGram
 883                                 }
 884                         }
 885                         // Otherwise, read as dataset... but only when required.
 886                         switch (mode) {
 887                         case XmlReadMode.Auto:
 888                         case XmlReadMode.InferSchema:
 889                         case XmlReadMode.IgnoreSchema:
 890                         case XmlReadMode.Fragment:
 891                                 break;
 892                         default:
 893                                 reader.Skip ();
 894                                 return mode;
 895                         }
 896                         XmlDataLoader Loader = new XmlDataLoader (this);
 897                         return Loader.LoadData (reader, mode);
 898                 }
 899                 #endregion // Public Methods
 900
 901                 #region Public Events
 902
 903                 [DataCategory ("Action")]
 904                 [DataSysDescription ("Occurs when it is not possible to merge schemas for two tables with the same name.")]
 905                 public event MergeFailedEventHandler MergeFailed;
 906
 907                 #endregion // Public Events
 908
 909                 #region Destructors
 910
 911                 ~DataSet ()
 912                 {
 913                 }
 914
 915                 #endregion Destructors
 916
 917                 #region IListSource methods
 918                 IList IListSource.GetList ()
 919                 {
 920                         return DefaultViewManager;
 921                 }
 922
 923                 bool IListSource.ContainsListCollection {
 924                         get {
 925                                 return true;
 926                         }
 927                 }
 928                 #endregion IListSource methods
 929
 930                 #region ISupportInitialize methods
 931                 public void BeginInit ()
 932                 {
 933                 }
 934
 935                 public void EndInit ()
 936                 {
 937                 }
 938                 #endregion
 939
 940                 #region ISerializable
 941                 void ISerializable.GetObjectData (SerializationInfo si, StreamingContext sc)
 942                 {
 943                         StringWriter sw = new StringWriter ();
 944                         XmlTextWriter writer = new XmlTextWriter (sw);
 945                         DoWriteXmlSchema (writer);
 946                         writer.Flush ();
 947                         si.AddValue ("XmlSchema", sw.ToString ());
 948
 949                         sw = new StringWriter ();
 950                         writer = new XmlTextWriter (sw);
 951                         WriteXml (writer, XmlWriteMode.DiffGram);
 952                         writer.Flush ();
 953                         si.AddValue ("XmlDiffGram", sw.ToString ());
 954                 }
 955                 #endregion
 956
 957                 #region Protected Methods
 958                 protected void GetSerializationData (SerializationInfo info, StreamingContext context)
 959                 {
 960                         string s = info.GetValue ("XmlSchema", typeof (String)) as String;
 961                         XmlTextReader reader = new XmlTextReader (new StringReader (s));
 962                         ReadXmlSchema (reader);
 963                         reader.Close ();
 964
 965                         s = info.GetValue ("XmlDiffGram", typeof (String)) as String;
 966                         reader = new XmlTextReader (new StringReader (s));
 967                         ReadXml (reader, XmlReadMode.DiffGram);
 968                         reader.Close ();
 969                 }
 970
 971
 972                 protected virtual System.Xml.Schema.XmlSchema GetSchemaSerializable ()
 973                 {
 974                         return null;
 975                 }
 976
 977                 protected virtual void ReadXmlSerializable (XmlReader reader)
 978                 {
 979                         reader.MoveToContent ();
 980                         reader.ReadStartElement ();
 981                         reader.MoveToContent ();
 982                         ReadXmlSchema (reader);
 983                         reader.MoveToContent ();
 984                         ReadXml (reader, XmlReadMode.DiffGram);
 985                         reader.MoveToContent ();
 986                         reader.ReadEndElement ();
 987                 }
 988
 989                 void IXmlSerializable.ReadXml (XmlReader reader)
 990                 {
 991                         ReadXmlSerializable(reader);
 992                 }
 993
 994                 void IXmlSerializable.WriteXml (XmlWriter writer)
 995                 {
 996                         DoWriteXmlSchema (writer);
 997                         WriteXml (writer, XmlWriteMode.DiffGram);
 998                 }
 999
1000                 protected virtual bool ShouldSerializeRelations ()
1001                 {
1002                         return true;
1003                 }
1004
1005                 protected virtual bool ShouldSerializeTables ()
1006                 {
1007                         return true;
1008                 }
1009
1010                 [MonoTODO]
1011                 protected internal virtual void OnPropertyChanging (PropertyChangedEventArgs pcevent)
1012                 {
1013                 }
1014
1015                 [MonoTODO]
1016                 protected virtual void OnRemoveRelation (DataRelation relation)
1017                 {
1018                 }
1019
1020                 [MonoTODO]
1021                 protected virtual void OnRemoveTable (DataTable table)
1022                 {
1023                 }
1024
1025                 protected internal virtual void OnMergeFailed (MergeFailedEventArgs e)
1026                 {
1027                         if (MergeFailed != null)
1028                                 MergeFailed (this, e);
1029                 }
1030
1031                 [MonoTODO]
1032                 protected internal void RaisePropertyChanging (string name)
1033                 {
1034                 }
1035                 #endregion
1036
1037                 #region Private Xml Serialisation
1038
1039                 private string WriteObjectXml (object o)
1040                 {
1041                         switch (Type.GetTypeCode (o.GetType ())) {
1042                                 case TypeCode.Boolean:
1043                                         return XmlConvert.ToString ((Boolean) o);
1044                                 case TypeCode.Byte:
1045                                         return XmlConvert.ToString ((Byte) o);
1046                                 case TypeCode.Char:
1047                                         return XmlConvert.ToString ((Char) o);
1048                                 case TypeCode.DateTime:
1049                                         return XmlConvert.ToString ((DateTime) o);
1050                                 case TypeCode.Decimal:
1051                                         return XmlConvert.ToString ((Decimal) o);
1052                                 case TypeCode.Double:
1053                                         return XmlConvert.ToString ((Double) o);
1054                                 case TypeCode.Int16:
1055                                         return XmlConvert.ToString ((Int16) o);
1056                                 case TypeCode.Int32:
1057                                         return XmlConvert.ToString ((Int32) o);
1058                                 case TypeCode.Int64:
1059                                         return XmlConvert.ToString ((Int64) o);
1060                                 case TypeCode.SByte:
1061                                         return XmlConvert.ToString ((SByte) o);
1062                                 case TypeCode.Single:
1063                                         return XmlConvert.ToString ((Single) o);
1064                                 case TypeCode.UInt16:
1065                                         return XmlConvert.ToString ((UInt16) o);
1066                                 case TypeCode.UInt32:
1067                                         return XmlConvert.ToString ((UInt32) o);
1068                                 case TypeCode.UInt64:
1069                                         return XmlConvert.ToString ((UInt64) o);
1070                         }
1071                         if (o is TimeSpan) return XmlConvert.ToString ((TimeSpan) o);
1072                         if (o is Guid) return XmlConvert.ToString ((Guid) o);
1073                         if (o is byte[]) return Convert.ToBase64String ((byte[])o);
1074                         return o.ToString ();
1075                 }
1076
1077                 private void WriteTables (XmlWriter writer, XmlWriteMode mode, DataTableCollection tableCollection, DataRowVersion version)
1078                 {
1079                         //Write out each table in order, providing it is not
1080                         //part of another table structure via a nested parent relationship
1081                         foreach (DataTable table in tableCollection) {
1082                                 bool isTopLevel = true;
1083                                 foreach (DataRelation rel in table.ParentRelations) {
1084                                         if (rel.Nested) {
1085                                                 isTopLevel = false;
1086                                                 break;
1087                                         }
1088                                 }
1089
1090                                 if (isTopLevel) {
1091                                         WriteTable ( writer, table, mode, version);
1092                                 }
1093                         }
1094                 }
1095
1096                 private void WriteTable (XmlWriter writer, DataTable table, XmlWriteMode mode, DataRowVersion version)
1097                 {
1098                         DataRow[] rows = new DataRow [table.Rows.Count];
1099                         table.Rows.CopyTo (rows, 0);
1100                         WriteTable (writer, rows, mode, version);
1101                 }
1102
1103                 private void WriteTable (XmlWriter writer, DataRow[] rows, XmlWriteMode mode, DataRowVersion version)
1104                 {
1105                         //The columns can be attributes, hidden, elements, or simple content
1106                         //There can be 0-1 simple content cols or 0-* elements
1107                         System.Collections.ArrayList atts;
1108                         System.Collections.ArrayList elements;
1109                         DataColumn simple = null;
1110
1111                         if (rows.Length == 0) return;
1112                         DataTable table = rows[0].Table;
1113                         SplitColumns (table, out atts, out elements, out simple);
1114                         //sort out the namespacing
1115                         string nspc = table.Namespace.Length > 0 ? table.Namespace : Namespace;
1116
1117                         foreach (DataRow row in rows) {
1118                                 if (!row.HasVersion(version) ||
1119                                    (mode == XmlWriteMode.DiffGram && row.RowState == DataRowState.Unchanged
1120                                       && version == DataRowVersion.Original))
1121                                         continue;
1122
1123                                 // First check are all the rows null. If they are we just write empty element
1124                                 bool AllNulls = true;
1125                                 foreach (DataColumn dc in table.Columns) {
1126
1127                                         if (row [dc.ColumnName, version] != DBNull.Value) {
1128                                                 AllNulls = false;
1129                                                 break;
1130                                         }
1131                                 }
1132
1133                                 // If all of the columns were null, we have to write empty element
1134                                 if (AllNulls) {
1135                                         writer.WriteElementString (table.TableName, "");
1136                                         continue;
1137                                 }
1138
1139                                 WriteTableElement (writer, mode, table, row, version);
1140
1141                                 foreach (DataColumn col in atts) {
1142                                         WriteColumnAsAttribute (writer, mode, col, row, version);
1143                                 }
1144
1145                                 if (simple != null) {
1146                                         writer.WriteString (WriteObjectXml (row[simple, version]));
1147                                 }
1148                                 else {
1149                                         foreach (DataColumn col in elements) {
1150                                                 WriteColumnAsElement (writer, mode, col, row, version);
1151                                         }
1152                                 }
1153
1154                                 foreach (DataRelation relation in table.ChildRelations) {
1155                                         if (relation.Nested) {
1156                                                 WriteTable (writer, row.GetChildRows (relation), mode, version);
1157                                         }
1158                                 }
1159
1160                                 writer.WriteEndElement ();
1161                         }
1162
1163                 }
1164
1165                 private void WriteColumnAsElement (XmlWriter writer, XmlWriteMode mode, DataColumn col, DataRow row, DataRowVersion version)
1166                 {
1167                         string colnspc = null;
1168                         object rowObject = row [col, version];
1169
1170                         if (rowObject == null || rowObject == DBNull.Value)
1171                                 return;
1172
1173                         if (col.Namespace != String.Empty)
1174                                 colnspc = col.Namespace;
1175
1176                         //TODO check if I can get away with write element string
1177                         WriteStartElement (writer, mode, colnspc, col.Prefix, col.ColumnName);
1178                         writer.WriteString (WriteObjectXml (rowObject));
1179                         writer.WriteEndElement ();
1180                 }
1181
1182                 private void WriteColumnAsAttribute (XmlWriter writer, XmlWriteMode mode, DataColumn col, DataRow row, DataRowVersion version)
1183                 {
1184                         WriteAttributeString (writer, mode, col.Namespace, col.Prefix, col.ColumnName, row[col, version].ToString ());
1185                 }
1186
1187                 private void WriteTableElement (XmlWriter writer, XmlWriteMode mode, DataTable table, DataRow row, DataRowVersion version)
1188                 {
1189                         //sort out the namespacing
1190                         string nspc = table.Namespace.Length > 0 ? table.Namespace : Namespace;
1191
1192                         WriteStartElement (writer, mode, nspc, table.Prefix, table.TableName);
1193
1194                         if (mode == XmlWriteMode.DiffGram) {
1195                                 WriteAttributeString (writer, mode, XmlConstants.DiffgrNamespace, XmlConstants.DiffgrPrefix, "id", table.TableName + (row.XmlRowID + 1));
1196                                 WriteAttributeString (writer, mode, XmlConstants.MsdataNamespace, XmlConstants.MsdataPrefix, "rowOrder", row.XmlRowID.ToString());
1197                                 string modeName = null;
1198                                 if (row.RowState == DataRowState.Modified)
1199                                         modeName = "modified";
1200                                 else if (row.RowState == DataRowState.Added)
1201                                         modeName = "inserted";
1202
1203                                 if (version != DataRowVersion.Original && modeName != null)
1204                                         WriteAttributeString (writer, mode, XmlConstants.DiffgrNamespace, XmlConstants.DiffgrPrefix, "hasChanges", modeName);
1205                         }
1206                 }
1207
1208                 private void WriteStartElement (XmlWriter writer, XmlWriteMode mode, string nspc, string prefix, string name)
1209                 {
1210                         writer.WriteStartElement (prefix, name, nspc);
1211                 }
1212
1213                 private void WriteAttributeString (XmlWriter writer, XmlWriteMode mode, string nspc, string prefix, string name, string stringValue)
1214                 {
1215                         switch ( mode) {
1216                                 case XmlWriteMode.WriteSchema:
1217                                         writer.WriteAttributeString (prefix, name, nspc);
1218                                         break;
1219                                 case XmlWriteMode.DiffGram:
1220                                         writer.WriteAttributeString (prefix, name, nspc,stringValue);
1221                                         break;
1222                                 default:
1223                                         writer.WriteAttributeString (name, stringValue);
1224                                         break;
1225                         };
1226                 }
1227
1228                 internal void WriteIndividualTableContent (XmlWriter writer, DataTable table, XmlWriteMode mode)
1229                 {
1230                         ((XmlTextWriter)writer).Formatting = Formatting.Indented;
1231
1232                         if (mode == XmlWriteMode.DiffGram) {
1233                                 SetTableRowsID (table);
1234                                 WriteDiffGramElement (writer);
1235                         }
1236
1237                         WriteStartElement (writer, mode, Namespace, Prefix, XmlConvert.EncodeName (DataSetName));
1238
1239                         WriteTable (writer, table, mode, DataRowVersion.Default);
1240
1241                         if (mode == XmlWriteMode.DiffGram) {
1242                                 writer.WriteEndElement (); //DataSet name
1243                                 if (HasChanges (DataRowState.Modified | DataRowState.Deleted)) {
1244
1245                                         DataSet beforeDS = GetChanges (DataRowState.Modified | DataRowState.Deleted);
1246                                         WriteStartElement (writer, XmlWriteMode.DiffGram, XmlConstants.DiffgrNamespace, XmlConstants.DiffgrPrefix, "before");
1247                                         WriteTable (writer, beforeDS.Tables [table.TableName], mode, DataRowVersion.Original);
1248                                         writer.WriteEndElement ();
1249                                 }
1250                         }
1251                         writer.WriteEndElement (); // DataSet name or diffgr:diffgram
1252                 }
1253
1254                 XmlSchema IXmlSerializable.GetSchema ()
1255                 {
1256                         return BuildSchema ();
1257                 }
1258
1259                 XmlSchema BuildSchema ()
1260                 {
1261                         return BuildSchema (Tables, Relations);
1262                 }
1263
1264                 internal XmlSchema BuildSchema (DataTableCollection tables, DataRelationCollection relations)
1265                 {
1266                         string constraintPrefix = "";
1267                         XmlSchema schema = new XmlSchema ();
1268
1269                         schema.Namespaces.Add("xs", XmlSchema.Namespace);
1270                         schema.Namespaces.Add(XmlConstants.MsdataPrefix, XmlConstants.MsdataNamespace);
1271
1272                         if (Namespace != "") {
1273                                 schema.AttributeFormDefault = XmlSchemaForm.Qualified;
1274                                 schema.ElementFormDefault = XmlSchemaForm.Qualified;
1275                                 schema.TargetNamespace = Namespace;
1276                                 schema.Namespaces.Add(XmlConstants.TnsPrefix, Namespace);
1277                                 constraintPrefix = XmlConstants.TnsPrefix + ":";
1278                         }
1279
1280                         // Namespaces defined in tables and columns
1281                         // FIXME: What if the same prefix is mapped? Create another
1282                         //        prefix and apply them. (But how?)
1283                         foreach (DataTable dt in tables) {
1284                                 if (dt.Namespace != String.Empty)
1285                                         schema.Namespaces.Add (dt.Prefix, dt.Namespace);
1286                                 foreach (DataColumn col in dt.Columns)
1287                                         if (col.Namespace != String.Empty)
1288                                                 schema.Namespaces.Add (col.Prefix, col.Namespace);
1289                         }
1290
1291                         // set the schema id
1292                         schema.Id = DataSetName;
1293                         XmlDocument doc = new XmlDocument ();
1294                         XmlAttribute xmlnsAttr = doc.CreateAttribute("xmlns");
1295                         xmlnsAttr.Value = Namespace;
1296
1297                         schema.UnhandledAttributes = new XmlAttribute[] {xmlnsAttr};
1298
1299                         XmlSchemaElement elem = new XmlSchemaElement ();
1300                         elem.Name = XmlConvert.EncodeName (DataSetName);
1301
1302                         XmlAttribute[] atts = new XmlAttribute [2];
1303                         atts[0] = doc.CreateAttribute (XmlConstants.MsdataPrefix,  XmlConstants.IsDataSet, XmlConstants.MsdataNamespace);
1304                         atts[0].Value = "true";
1305
1306                         atts[1] = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.Locale, XmlConstants.MsdataNamespace);
1307                         atts[1].Value = locale.Name;
1308
1309                         elem.UnhandledAttributes = atts;
1310
1311                         schema.Items.Add (elem);
1312
1313                         XmlSchemaComplexType complex = new XmlSchemaComplexType ();
1314                         elem.SchemaType = complex;
1315
1316                         XmlSchemaChoice choice = new XmlSchemaChoice ();
1317                         complex.Particle = choice;
1318                         choice.MaxOccursString = XmlConstants.Unbounded;
1319
1320                         //Write out schema for each table in order
1321                         foreach (DataTable table in tables) {
1322                                 bool isTopLevel = true;
1323                                 foreach (DataRelation rel in table.ParentRelations) {
1324                                         if (rel.Nested) {
1325                                                 isTopLevel = false;
1326                                                 break;
1327                                         }
1328                                 }
1329
1330                                 if (isTopLevel){
1331                                         choice.Items.Add (GetTableSchema (doc, table));
1332                                 }
1333                         }
1334
1335                         AddConstraintsToSchema (elem, constraintPrefix, tables, relations);
1336                         return schema;
1337                 }
1338
1339                 // Add all constraints in all tables to the schema.
1340                 private void AddConstraintsToSchema (XmlSchemaElement elem, string constraintPrefix, DataTableCollection tables, DataRelationCollection relations)
1341                 {
1342                         // first add all unique constraints.
1343                         Hashtable uniqueNames = AddUniqueConstraints (elem, constraintPrefix, tables);
1344                         // Add all foriegn key constraints.
1345                         AddForeignKeys (uniqueNames, elem, constraintPrefix, relations);
1346                 }
1347
1348                 // Add unique constaraints to the schema.
1349                 // return hashtable with the names of all XmlSchemaUnique elements we created.
1350                 private Hashtable AddUniqueConstraints (XmlSchemaElement elem, string constraintPrefix, DataTableCollection tables)
1351                 {
1352                         XmlDocument doc = new XmlDocument();
1353                         Hashtable uniqueNames = new Hashtable();
1354                         foreach (DataTable table in tables) {
1355
1356                                 foreach (Constraint constaint in table.Constraints) {
1357
1358                                         if (constaint is UniqueConstraint) {
1359                                                 ArrayList attrs = new ArrayList ();
1360                                                 XmlAttribute attrib;
1361                                                 UniqueConstraint uqConst = (UniqueConstraint)constaint;
1362                                                 XmlSchemaUnique uniq = new XmlSchemaUnique ();
1363
1364                                                 // if column of the constraint is hidden do not write the constraint.
1365                                                 bool isHidden = false;
1366                                                 foreach (DataColumn column in uqConst.Columns) {
1367                                                         if (column.ColumnMapping == MappingType.Hidden) {
1368                                                                 isHidden = true;
1369                                                                 break;
1370                                                         }
1371                                                 }
1372
1373                                                 if (isHidden)
1374                                                         continue;
1375
1376                                                 // if constaraint name do not exist in the hashtable we can use it.
1377                                                 if (!uniqueNames.ContainsKey (uqConst.ConstraintName)) {
1378                                                         uniq.Name = uqConst.ConstraintName;
1379                                                 }
1380                                                 // generate new constraint name for the XmlSchemaUnique element.
1381                                                 else {
1382                                                         uniq.Name = uqConst.Table.TableName + "_" + uqConst.ConstraintName;
1383                                                         attrib = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.ConstraintName, XmlConstants.MsdataNamespace);
1384                                                         attrib.Value = uqConst.ConstraintName;
1385                                                         attrs.Add (attrib);
1386                                                 }
1387                                                 if (uqConst.IsPrimaryKey) {
1388                                                         attrib = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.PrimaryKey, XmlConstants.MsdataNamespace);
1389                                                         attrib.Value = "true";
1390                                                         attrs.Add (attrib);
1391                                                 }
1392
1393                                                 uniq.UnhandledAttributes = (XmlAttribute[])attrs.ToArray (typeof (XmlAttribute));
1394
1395                                                 uniq.Selector = new XmlSchemaXPath();
1396                                                 uniq.Selector.XPath = ".//"+constraintPrefix + uqConst.Table.TableName;
1397                                                 XmlSchemaXPath field;
1398                                                 foreach (DataColumn column in uqConst.Columns) {
1399                                                         field = new XmlSchemaXPath();
1400                                                         field.XPath = constraintPrefix+column.ColumnName;
1401                                                         uniq.Fields.Add(field);
1402                                                 }
1403
1404                                                 elem.Constraints.Add (uniq);
1405                                                 uniqueNames.Add (uniq.Name, null);
1406                                         }
1407                                 }
1408                         }
1409                         return uniqueNames;
1410                 }
1411
1412                 // Add the foriegn keys to the schema.
1413                 private void AddForeignKeys (Hashtable uniqueNames, XmlSchemaElement elem, string constraintPrefix, DataRelationCollection relations)
1414                 {
1415                         if (relations == null) return;
1416
1417                         XmlDocument doc = new XmlDocument();
1418                         foreach (DataRelation rel in relations) {
1419
1420                                 if (rel.ParentKeyConstraint == null || rel.ChildKeyConstraint == null)
1421                                         continue;
1422
1423                                 ArrayList attrs = new ArrayList ();
1424                                 XmlAttribute attrib;
1425                                 XmlSchemaKeyref keyRef = new XmlSchemaKeyref();
1426                                 keyRef.Name = rel.RelationName;
1427                                 ForeignKeyConstraint fkConst = rel.ChildKeyConstraint;
1428                                 UniqueConstraint uqConst = rel.ParentKeyConstraint;
1429
1430                                 string concatName = rel.ParentTable.TableName + "_" + uqConst.ConstraintName;
1431                                 // first try to find the concatenated name. If we didn't find it - use constraint name.
1432                                 if (uniqueNames.ContainsKey (concatName)) {
1433                                         keyRef.Refer = new XmlQualifiedName(concatName);
1434                                 }
1435                                 else {
1436                                         keyRef.Refer = new XmlQualifiedName(uqConst.ConstraintName);
1437                                 }
1438
1439                                 if (rel.Nested) {
1440                                         attrib = doc.CreateAttribute (XmlConstants.MsdataPrefix,  XmlConstants.IsNested, XmlConstants.MsdataNamespace);
1441                                         attrib.Value = "true";
1442                                         attrs.Add (attrib);
1443                                 }
1444
1445                                 keyRef.Selector = new XmlSchemaXPath();
1446                                 keyRef.Selector.XPath = ".//" + constraintPrefix + rel.ChildTable.TableName;
1447                                 XmlSchemaXPath field;
1448                                 foreach (DataColumn column in rel.ChildColumns) {
1449                                         field = new XmlSchemaXPath();
1450                                         field.XPath = constraintPrefix+column.ColumnName;
1451                                         keyRef.Fields.Add(field);
1452                                 }
1453                                 keyRef.UnhandledAttributes = (XmlAttribute[])attrs.ToArray (typeof (XmlAttribute));
1454                                 elem.Constraints.Add (keyRef);
1455                         }
1456                 }
1457
1458                 private XmlSchemaElement GetTableSchema (XmlDocument doc, DataTable table)
1459                 {
1460                         ArrayList elements;
1461                         ArrayList atts;
1462                         DataColumn simple;
1463
1464                         SplitColumns (table, out atts, out elements, out simple);
1465
1466                         XmlSchemaElement elem = new XmlSchemaElement ();
1467                         elem.Name = table.TableName;
1468
1469                         XmlSchemaComplexType complex = new XmlSchemaComplexType ();
1470                         elem.SchemaType = complex;
1471
1472                         //TODO - what about the simple content?
1473                         if (simple != null) {
1474                                 // add simpleContent
1475                                 XmlSchemaSimpleContent simpleContent = new XmlSchemaSimpleContent();
1476                                 complex.ContentModel = simpleContent;
1477
1478                                 // add column name attribute
1479                                 XmlAttribute[] xlmAttrs = new XmlAttribute [2];
1480                                 xlmAttrs[0] = doc.CreateAttribute (XmlConstants.MsdataPrefix,  XmlConstants.ColumnName, XmlConstants.MsdataNamespace);
1481                                 xlmAttrs[0].Value = simple.ColumnName;
1482
1483                                 // add ordinal attribute
1484                                 xlmAttrs[1] = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.Ordinal, XmlConstants.MsdataNamespace);
1485                                 xlmAttrs[1].Value = simple.Ordinal.ToString();
1486                                 simpleContent.UnhandledAttributes = xlmAttrs;
1487
1488
1489                                 // add extension
1490                                 XmlSchemaSimpleContentExtension extension = new XmlSchemaSimpleContentExtension();
1491                                 simpleContent.Content = extension;
1492                                 extension.BaseTypeName = MapType (simple.DataType);
1493
1494                         }
1495                         else {
1496                                 //A sequence of element types or a simple content node
1497                                 //<xs:sequence>
1498                                 XmlSchemaSequence seq = new XmlSchemaSequence ();
1499                                 complex.Particle = seq;
1500
1501                                 foreach (DataColumn col in elements) {
1502
1503                                         // Add element for the column.
1504                                         XmlSchemaElement colElem = new XmlSchemaElement ();
1505                                         ArrayList xattrs = new ArrayList();
1506                                         XmlAttribute xattr;
1507                                         colElem.Name = col.ColumnName;
1508
1509                                         if (col.ColumnName != col.Caption && col.Caption != String.Empty) {
1510                                                 xattr = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.Caption, XmlConstants.MsdataNamespace);
1511                                                 xattr.Value = col.Caption;
1512                                                 xattrs.Add (xattr);
1513                                         }
1514
1515                                         if (col.AutoIncrement == true) {
1516                                                 xattr = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.AutoIncrement, XmlConstants.MsdataNamespace);
1517                                                 xattr.Value = "true";
1518                                                 xattrs.Add (xattr);
1519                                         }
1520
1521                                         if (col.AutoIncrementSeed != 0) {
1522                                                 xattr = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.AutoIncrementSeed, XmlConstants.MsdataNamespace);
1523                                                 xattr.Value = col.AutoIncrementSeed.ToString();
1524                                                 xattrs.Add (xattr);
1525                                         }
1526
1527                                         if (col.DefaultValue.ToString () != String.Empty)
1528                                                 colElem.DefaultValue = col.DefaultValue.ToString ();
1529
1530                                         if (col.MaxLength < 0)
1531                                                 colElem.SchemaTypeName = MapType (col.DataType);
1532
1533                                         if (colElem.SchemaTypeName == XmlConstants.QnString && col.DataType != typeof (string)
1534                                                 && col.DataType != typeof (char)) {
1535                                                 xattr = doc.CreateAttribute (XmlConstants.MsdataPrefix, XmlConstants.DataType, XmlConstants.MsdataNamespace);
1536                                                 xattr.Value = col.DataType.ToString();
1537                                                 xattrs.Add (xattr);
1538                                         }
1539
1540                                         if (col.AllowDBNull) {
1541                                                 colElem.MinOccurs = 0;
1542                                         }
1543
1544                                         //writer.WriteAttributeString (XmlConstants.MsdataPrefix,
1545                                         //                            XmlConstants.Ordinal,
1546                                         //                            XmlConstants.MsdataNamespace,
1547                                         //                            col.Ordinal.ToString ());
1548
1549                                         // Write SimpleType if column have MaxLength
1550                                         if (col.MaxLength > -1) {
1551                                                 colElem.SchemaType = GetTableSimpleType (doc, col);
1552                                         }
1553
1554                                         colElem.UnhandledAttributes = (XmlAttribute[])xattrs.ToArray(typeof (XmlAttribute));
1555                                         seq.Items.Add (colElem);
1556                                 }
1557
1558                                 foreach (DataRelation rel in table.ChildRelations) {
1559                                         if (rel.Nested) {
1560                                                 seq.Items.Add(GetTableSchema (doc, rel.ChildTable));
1561                                         }
1562                                 }
1563                         }
1564
1565                         //Then a list of attributes
1566                         foreach (DataColumn col in atts) {
1567                                 //<xs:attribute name=col.ColumnName form="unqualified" type=MappedType/>
1568                                 XmlSchemaAttribute att = new XmlSchemaAttribute ();
1569                                 att.Name = col.ColumnName;
1570                                 att.Form = XmlSchemaForm.Unqualified;
1571                                 att.SchemaTypeName = MapType (col.DataType);
1572                                 complex.Attributes.Add (att);
1573                         }
1574
1575                         return elem;
1576                 }
1577
1578                 private XmlSchemaSimpleType GetTableSimpleType (XmlDocument doc, DataColumn col)
1579                 {
1580                         // SimpleType
1581                         XmlSchemaSimpleType simple = new XmlSchemaSimpleType ();
1582
1583                         // Restriction
1584                         XmlSchemaSimpleTypeRestriction restriction = new XmlSchemaSimpleTypeRestriction ();
1585                         restriction.BaseTypeName = MapType (col.DataType);
1586
1587                         // MaxValue
1588                         XmlSchemaMaxLengthFacet max = new XmlSchemaMaxLengthFacet ();
1589                         max.Value = XmlConvert.ToString (col.MaxLength);
1590                         restriction.Facets.Add (max);
1591
1592                         simple.Content = restriction;
1593                         return simple;
1594                 }
1595
1596                 private void DoWriteXmlSchema (XmlWriter writer)
1597                 {
1598                         BuildSchema ().Write (writer);
1599                 }
1600
1601                 ///<summary>
1602                 /// Helper function to split columns into attributes elements and simple
1603                 /// content
1604                 /// </summary>
1605                 private void SplitColumns (DataTable table,
1606                         out ArrayList atts,
1607                         out ArrayList elements,
1608                         out DataColumn simple)
1609                 {
1610                         //The columns can be attributes, hidden, elements, or simple content
1611                         //There can be 0-1 simple content cols or 0-* elements
1612                         atts = new System.Collections.ArrayList ();
1613                         elements = new System.Collections.ArrayList ();
1614                         simple = null;
1615
1616                         //Sort out the columns
1617                         foreach (DataColumn col in table.Columns) {
1618                                 switch (col.ColumnMapping) {
1619                                         case MappingType.Attribute:
1620                                                 atts.Add (col);
1621                                                 break;
1622                                         case MappingType.Element:
1623                                                 elements.Add (col);
1624                                                 break;
1625                                         case MappingType.SimpleContent:
1626                                                 if (simple != null) {
1627                                                         throw new System.InvalidOperationException ("There may only be one simple content element");
1628                                                 }
1629                                                 simple = col;
1630                                                 break;
1631                                         default:
1632                                                 //ignore Hidden elements
1633                                                 break;
1634                                 }
1635                         }
1636                 }
1637
1638                 private void WriteDiffGramElement(XmlWriter writer)
1639                 {
1640                         WriteStartElement (writer, XmlWriteMode.DiffGram, XmlConstants.DiffgrNamespace, XmlConstants.DiffgrPrefix, "diffgram");
1641                         WriteAttributeString(writer, XmlWriteMode.DiffGram, null, "xmlns", XmlConstants.MsdataPrefix, XmlConstants.MsdataNamespace);
1642                 }
1643
1644                 private void SetRowsID()
1645                 {
1646                         foreach (DataTable Table in Tables)
1647                                 SetTableRowsID (Table);
1648                 }
1649
1650                 private void SetTableRowsID (DataTable Table)
1651                 {
1652                         int dataRowID = 0;
1653                         foreach (DataRow Row in Table.Rows) {
1654                                 Row.XmlRowID = dataRowID;
1655                                 dataRowID++;
1656                         }
1657                 }
1658
1659
1660                 private XmlQualifiedName MapType (Type type)
1661                 {
1662                         switch (Type.GetTypeCode (type)) {
1663                                 case TypeCode.String: return XmlConstants.QnString;
1664                                 case TypeCode.Int16: return XmlConstants.QnShort;
1665                                 case TypeCode.Int32: return XmlConstants.QnInt;
1666                                 case TypeCode.Int64: return XmlConstants.QnLong;
1667                                 case TypeCode.Boolean: return XmlConstants.QnBoolean;
1668                                 case TypeCode.Byte: return XmlConstants.QnUnsignedByte;
1669                                 //case TypeCode.Char: return XmlConstants.QnChar;
1670                                 case TypeCode.DateTime: return XmlConstants.QnDateTime;
1671                                 case TypeCode.Decimal: return XmlConstants.QnDecimal;
1672                                 case TypeCode.Double: return XmlConstants.QnDouble;
1673                                 case TypeCode.SByte: return XmlConstants.QnSbyte;
1674                                 case TypeCode.Single: return XmlConstants.QnFloat;
1675                                 case TypeCode.UInt16: return XmlConstants.QnUsignedShort;
1676                                 case TypeCode.UInt32: return XmlConstants.QnUnsignedInt;
1677                                 case TypeCode.UInt64: return XmlConstants.QnUnsignedLong;
1678                         }
1679
1680                         if (typeof (TimeSpan) == type)
1681                                 return XmlConstants.QnDuration;
1682                         else if (typeof (System.Uri) == type)
1683                                 return XmlConstants.QnUri;
1684                         else if (typeof (byte[]) == type)
1685                                 return XmlConstants.QnBase64Binary;
1686                         else if (typeof (XmlQualifiedName) == type)
1687                                 return XmlConstants.QnXmlQualifiedName;
1688                         else
1689                                 return XmlConstants.QnString;
1690                 }
1691
1692                 #endregion //Private Xml Serialisation
1693         }
1694 }