mcs/class/System.Web/System.Web.UI.WebControls/DataGrid.cs

   1 //
   2 // System.Web.UI.WebControls.DataGrid.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Gaurav Vaish (2002)
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 using System;
  13 using System.Collections;
  14 using System.Globalization;
  15 using System.Web;
  16 using System.Web.UI;
  17 using System.Web.Util;
  18 using System.ComponentModel;
  19 using System.ComponentModel.Design;
  20 using System.Reflection;
  21
  22 namespace System.Web.UI.WebControls
  23 {
  24         [Designer ("System.Web.UI.Design.WebControls.DataGridDesigner, " + Consts.AssemblySystem_Design, typeof (IDesigner))]\r
  25         [Editor ("System.Web.UI.Design.WebControls.DataGridComponentEditor, " + Consts.AssemblySystem_Design, typeof (ComponentEditor))]
  26         public class DataGrid : BaseDataList, INamingContainer
  27         {
  28                 public const string CancelCommandName       = "Cancel";
  29                 public const string DeleteCommandName       = "Delete";
  30                 public const string EditCommandName         = "Edit";
  31                 public const string NextPageCommandArgument = "Next";
  32                 public const string PageCommandName         = "Page";
  33                 public const string PrevPageCommandArgument = "Prev";
  34                 public const string SelectCommandName       = "Select";
  35                 public const string SortCommandName         = "Sort";
  36                 public const string UpdateCommandName       = "Update";
  37
  38                 private TableItemStyle alternatingItemStyle;
  39                 private TableItemStyle editItemStyle;
  40                 private TableItemStyle headerStyle;
  41                 private TableItemStyle footerStyle;
  42                 private TableItemStyle itemStyle;
  43                 private TableItemStyle selectedItemStyle;
  44                 private DataGridPagerStyle pagerStyle;
  45
  46                 private DataGridColumnCollection columns;
  47                 private ArrayList                columnsArrayList;
  48                 private DataGridItemCollection   items;
  49                 private ArrayList                itemsArrayList;
  50                 private PagedDataSource          pagedDataSource;
  51
  52                 private ArrayList   autoGenColsArrayList;
  53                 private IEnumerator storedData;
  54                 private object      storedDataFirst;
  55                 private bool        storedDataValid;
  56
  57                 private static readonly object CancelCommandEvent    = new object();
  58                 private static readonly object DeleteCommandEvent    = new object();
  59                 private static readonly object EditCommandEvent      = new object();
  60                 private static readonly object ItemCommandEvent      = new object();
  61                 private static readonly object ItemCreatedEvent      = new object();
  62                 private static readonly object ItemDataBoundEvent    = new object();
  63                 private static readonly object PageIndexChangedEvent = new object();
  64                 private static readonly object SortCommandEvent      = new object();
  65                 private static readonly object UpdateCommandEvent    = new object();
  66
  67                 public DataGrid(): base()
  68                 {
  69                 }
  70
  71                 [DefaultValue (false), WebCategory ("Paging")]
  72                 [WebSysDescription ("Allows custom paging.")]
  73                 public virtual bool AllowCustomPaging
  74                 {
  75                         get
  76                         {
  77                                 object o = ViewState["AllowCustomPaging"];
  78                                 if(o != null)
  79                                         return (bool)o;
  80                                 return false;
  81                         }
  82                         set
  83                         {
  84                                 ViewState["AllowCustomPaging"] = value;
  85                         }
  86                 }
  87
  88                 [DefaultValue (false), WebCategory ("Paging")]
  89                 [WebSysDescription ("Allow using multiple pages.")]
  90                 public virtual bool AllowPaging
  91                 {
  92                         get
  93                         {
  94                                 object o = ViewState["AllowPaging"];
  95                                 if(o != null)
  96                                         return (bool)o;
  97                                 return false;
  98                         }
  99                         set
 100                         {
 101                                 ViewState["AllowPaging"] = value;
 102                         }
 103                 }
 104
 105                 [DefaultValue (false), WebCategory ("Behavior")]
 106                 [WebSysDescription ("Allows the user to sort the table by clicking on column headers.")]
 107                 public virtual bool AllowSorting
 108                 {
 109                         get
 110                         {
 111                                 object o = ViewState["AllowSorting"];
 112                                 if(o != null)
 113                                         return (bool)o;
 114                                 return false;
 115                         }
 116                         set
 117                         {
 118                                 ViewState["AllowSorting"] = value;
 119                         }
 120                 }
 121
 122                 [NotifyParentProperty (true), WebCategory ("Style")]
 123                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 124                 [PersistenceMode (PersistenceMode.InnerProperty)]
 125                 [WebSysDescription ("The style applied to alternating items.")]
 126                 public virtual TableItemStyle AlternatingItemStyle
 127                 {
 128                         get
 129                         {
 130                                 if(alternatingItemStyle == null)
 131                                 {
 132                                         alternatingItemStyle = new TableItemStyle();
 133                                 }
 134                                 if(IsTrackingViewState)
 135                                 {
 136                                         alternatingItemStyle.TrackViewState();
 137                                 }
 138                                 return alternatingItemStyle;
 139                         }
 140                 }
 141
 142                 [DefaultValue (true), WebCategory ("Behavior")]
 143                 [WebSysDescription ("Automatically generate columns at runtime for each field found in the datasource.")]
 144                 public virtual bool AutoGenerateColumns
 145                 {
 146                         get
 147                         {
 148                                 object o = ViewState["AutoGenerateColumns"];
 149                                 if(o != null)
 150                                         return (bool)o;
 151                                 return true;
 152                         }
 153                         set
 154                         {
 155                                 ViewState["AutoGenerateColumns"] = value;
 156                         }
 157                 }
 158
 159                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
 160                 [Editor ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 161                 [WebSysDescription ("The URL to the image file used as background.")]
 162                 public virtual string BackImageUrl
 163                 {
 164                         get
 165                         {
 166                                  if (!ControlStyleCreated)\r
 167                                         return string.Empty; \r
 168                                 return ((TableStyle) base.ControlStyle).BackImageUrl;
 169                         }
 170                         set
 171                         {
 172                                  ((TableStyle) base.ControlStyle).BackImageUrl = value;
 173                         }
 174                 }
 175
 176                 [DefaultValue (true), WebCategory ("Behavior")]
 177                 [PersistenceMode (PersistenceMode.InnerProperty)]
 178                 [MergableProperty (false)]
 179                 [Editor ("System.Web.UI.Design.WebControls.DataGridColumnCollectionEditor, " + Consts.AssemblySystem_Design, typeof (ComponentEditor))]
 180                 [WebSysDescription ("Automatically generate columns at runtime for each field found in the datasource.")]
 181                 public virtual DataGridColumnCollection Columns
 182                 {
 183                         get
 184                         {
 185                                 if(columns == null)
 186                                 {
 187                                         columnsArrayList = new ArrayList();
 188                                         columns = new DataGridColumnCollection(this, columnsArrayList);
 189                                         if(IsTrackingViewState)
 190                                         {
 191                                                 ((IStateManager)columns).TrackViewState();
 192                                         }
 193                                 }
 194                                 return columns;
 195                         }
 196                 }
 197
 198                 [Browsable (false), Bindable (true)]
 199                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 200                 [WebSysDescription ("The index number for the currently selected page.")]
 201                 public int CurrentPageIndex
 202                 {
 203                         get
 204                         {
 205                                 object o = ViewState["CurrentPageIndex"];
 206                                 if(o != null)
 207                                         return (int)o;
 208                                 return 0;
 209                         }
 210                         set
 211                         {
 212                                 if(value < 0)
 213                                         throw new ArgumentOutOfRangeException ("value", "CurrentPageIndex value has to be 0 for 'not set' or > 0.");
 214                                 ViewState["CurrentPageIndex"] = value;
 215                         }
 216                 }
 217
 218
 219                 [DefaultValue (-1), WebCategory ("Misc")]
 220                 [WebSysDescription ("The index number for the currently edited item.")]
 221                 public virtual int EditItemIndex
 222                 {
 223                         get
 224                         {
 225                                 object o = ViewState["EditItemIndex"];
 226                                 if(o != null)
 227                                         return (int)o;
 228                                 return -1;
 229                         }
 230                         set
 231                         {
 232                                 if(value < -1)
 233                                         throw new ArgumentOutOfRangeException ("value", "EditItemIndex value has to be -1 for 'not set' or > -1.");
 234                                 ViewState["EditItemIndex"] = value;
 235                         }
 236                 }
 237
 238                 [NotifyParentProperty (true), WebCategory ("Style")]
 239                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 240                 [PersistenceMode (PersistenceMode.InnerProperty)]
 241                 [WebSysDescription ("The style applied to items that are currently being edited.")]
 242                 public virtual TableItemStyle EditItemStyle
 243                 {
 244                         get
 245                         {
 246                                 if(editItemStyle == null)
 247                                 {
 248                                         editItemStyle = new TableItemStyle();
 249                                         if(IsTrackingViewState)
 250                                         {
 251                                                 editItemStyle.TrackViewState();
 252                                         }
 253                                 }
 254                                 return editItemStyle;
 255                         }
 256                 }
 257
 258                 [DefaultValue (null), NotifyParentProperty (true), WebCategory ("Style")]
 259                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 260                 [PersistenceMode (PersistenceMode.InnerProperty)]
 261                 [WebSysDescription ("The style applied to the footer.")]
 262                 public virtual TableItemStyle FooterStyle
 263                 {
 264                         get
 265                         {
 266                                 if(footerStyle == null)
 267                                 {
 268                                         footerStyle = new TableItemStyle();
 269                                         if(IsTrackingViewState)
 270                                         {
 271                                                 footerStyle.TrackViewState();
 272                                         }
 273                                 }
 274                                 return footerStyle;
 275                         }
 276                 }
 277
 278                 [DefaultValue (null), NotifyParentProperty (true), WebCategory ("Style")]
 279                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 280                 [PersistenceMode (PersistenceMode.InnerProperty)]
 281                 [WebSysDescription ("The style applied to the header.")]
 282                 public virtual TableItemStyle HeaderStyle
 283                 {
 284                         get
 285                         {
 286                                 if(headerStyle == null)
 287                                 {
 288                                         headerStyle = new TableItemStyle();
 289                                         if(IsTrackingViewState)
 290                                         {
 291                                                 headerStyle.TrackViewState();
 292                                         }
 293                                 }
 294                                 return headerStyle;
 295                         }
 296                 }
 297
 298                 [Browsable (false)]
 299                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 300                 [WebSysDescription ("A collection containing all items.")]
 301                 public virtual DataGridItemCollection Items
 302                 {
 303                         get
 304                         {
 305                                 if(items == null)
 306                                 {
 307                                         if(itemsArrayList == null)
 308                                                 EnsureChildControls();
 309                                         if(itemsArrayList == null)
 310                                         {
 311                                                 itemsArrayList = new ArrayList();
 312                                         }
 313                                         items = new DataGridItemCollection(itemsArrayList);
 314                                 }
 315                                 return items;
 316                         }
 317                 }
 318
 319                 [NotifyParentProperty (true), WebCategory ("Style")]
 320                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 321                 [PersistenceMode (PersistenceMode.InnerProperty)]
 322                 [WebSysDescription ("The style applied to items.")]
 323                 public virtual TableItemStyle ItemStyle
 324                 {
 325                         get
 326                         {
 327                                 if(itemStyle == null)
 328                                 {
 329                                         itemStyle = new TableItemStyle();
 330                                         if(IsTrackingViewState)
 331                                         {
 332                                                 itemStyle.TrackViewState();
 333                                         }
 334                                 }
 335                                 return itemStyle;
 336                         }
 337                 }
 338
 339                 [Browsable (false)]
 340                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 341                 [WebSysDescription ("The number of pages.")]
 342                 public int PageCount
 343                 {
 344                         get
 345                         {
 346                                 if(pagedDataSource != null)
 347                                 {
 348                                         return pagedDataSource.PageCount;
 349                                 }
 350                                 object o = ViewState["PageCount"];
 351                                 if(o != null)
 352                                         return (int)o;
 353                                 return 0;
 354                         }
 355                 }
 356
 357                 [NotifyParentProperty (true), WebCategory ("Style")]
 358                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 359                 [PersistenceMode (PersistenceMode.InnerProperty)]
 360                 [WebSysDescription ("The style applied to the pager.")]
 361                 public virtual DataGridPagerStyle PagerStyle
 362                 {
 363                         get
 364                         {
 365                                 if(pagerStyle == null)
 366                                 {
 367                                         pagerStyle = new DataGridPagerStyle(this);
 368                                         if(IsTrackingViewState)
 369                                         {
 370                                                 pagerStyle.TrackViewState();
 371                                         }
 372                                 }
 373                                 return pagerStyle;
 374                         }
 375                 }
 376
 377                 [DefaultValue (10), WebCategory ("Paging")]
 378                 [WebSysDescription ("The maximum number of entries that are created per page.")]
 379                 public virtual int PageSize
 380                 {
 381                         get
 382                         {
 383                                 object o = ViewState["PageSize"];
 384                                 if(o != null)
 385                                         return (int)o;
 386                                 return 10;
 387                         }
 388                         set
 389                         {
 390                                 if(value < 1)
 391                                         throw new ArgumentOutOfRangeException();
 392                                 ViewState["PageSize"] = value;
 393                         }
 394                 }
 395
 396                 [DefaultValue (-1), Bindable (true)]
 397                 [WebSysDescription ("The index number for the currently selected item.")]
 398                 public virtual int SelectedIndex
 399                 {
 400                         get
 401                         {
 402                                 object o = ViewState["SelectedIndex"];
 403                                 if(o != null)
 404                                         return (int)o;
 405                                 return -1;
 406                         }
 407                         set
 408                         {
 409                                 if(value < -1)
 410                                         throw new ArgumentOutOfRangeException();
 411                                 int prevVal = SelectedIndex;
 412                                 ViewState["SelectedIndex"] = value;
 413                                 if (itemsArrayList != null) {
 414                                         if (prevVal !=-1 && prevVal < itemsArrayList.Count) {
 415                                                 DataGridItem prev = (DataGridItem)itemsArrayList[prevVal];
 416                                                 if(prev.ItemType != ListItemType.EditItem)
 417                                                 {
 418                                                         ListItemType newType = ListItemType.Item;
 419                                                         if( (prevVal % 2) != 0)
 420                                                         {
 421                                                                 newType = ListItemType.AlternatingItem;
 422                                                         }
 423                                                         prev.SetItemType(newType);
 424                                                 }
 425                                         }
 426
 427                                         if (value != -1 && itemsArrayList.Count > value) {
 428                                                 DataGridItem itemToSelect = (DataGridItem) itemsArrayList [value];
 429                                                 if (itemToSelect.ItemType != ListItemType.EditItem) {
 430                                                         itemToSelect.SetItemType (ListItemType.SelectedItem);
 431                                                 }
 432                                         }
 433                                 }
 434                         }
 435                 }
 436
 437                 [Browsable (false)]
 438                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 439                 [WebSysDescription ("The currently selected item.")]
 440                 public virtual DataGridItem SelectedItem
 441                 {
 442                         get
 443                         {
 444                                 if(SelectedIndex == -1)
 445                                         return null;
 446                                 return Items[SelectedIndex];
 447                         }
 448                 }
 449
 450                 [NotifyParentProperty (true), WebCategory ("Style")]
 451                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 452                 [PersistenceMode (PersistenceMode.InnerProperty)]
 453                 [WebSysDescription ("The style applied to the currently selected item.")]
 454                 public virtual TableItemStyle SelectedItemStyle
 455                 {
 456                         get
 457                         {
 458                                 if(selectedItemStyle == null)
 459                                 {
 460                                         selectedItemStyle = new TableItemStyle();
 461                                         if(IsTrackingViewState)
 462                                         {
 463                                                 selectedItemStyle.TrackViewState();
 464                                         }
 465                                 }
 466                                 return selectedItemStyle;
 467                         }
 468                 }
 469
 470                 [DefaultValue (false), Bindable (true), WebCategory ("Appearance")]
 471                 [WebSysDescription ("Determines if the footer should be shown.")]
 472                 public virtual bool ShowFooter
 473                 {
 474                         get
 475                         {
 476                                 object o = ViewState["ShowFooter"];
 477                                 if(o != null)
 478                                         return (bool)o;
 479                                 return false;
 480                         }
 481                         set
 482                         {
 483                                 ViewState["ShowFooter"] = value;
 484                         }
 485                 }
 486
 487                 [DefaultValue (false), Bindable (true), WebCategory ("Appearance")]
 488                 [WebSysDescription ("Determines if the header should be shown.")]
 489                 public virtual bool ShowHeader
 490                 {
 491                         get
 492                         {
 493                                 object o = ViewState["ShowHeader"];
 494                                 if(o != null)
 495                                         return (bool)o;
 496                                 return true;
 497                         }
 498                         set
 499                         {
 500                                 ViewState["ShowHeader"] = value;
 501                         }
 502                 }
 503
 504                 [Browsable (false)]
 505                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 506                 [WebSysDescription ("The number of items that are visible.")]
 507                 public virtual int VirtualItemCount
 508                 {
 509                         get
 510                         {
 511                                 object o = ViewState["VirtualItemCount"];
 512                                 if(o != null)
 513                                         return (int)o;
 514                                 return 0;
 515                         }
 516                         set
 517                         {
 518                                 if(value < 0)
 519                                         throw new ArgumentOutOfRangeException ("value", "VirtualItemCount value has to be >= 0.");
 520                                 ViewState["VirtualItemCount"] = value;
 521                         }
 522                 }
 523
 524                 [WebCategory ("Action")]
 525                 [WebSysDescription ("Raised when a cancel command is generated.")]
 526                 public event DataGridCommandEventHandler CancelCommand
 527                 {
 528                         add
 529                         {
 530                                 Events.AddHandler(CancelCommandEvent, value);
 531                         }
 532                         remove
 533                         {
 534                                 Events.RemoveHandler(CancelCommandEvent, value);
 535                         }
 536                 }
 537
 538                 [WebCategory ("Action")]
 539                 [WebSysDescription ("Raised when a delete command is generated.")]
 540                 public event DataGridCommandEventHandler DeleteCommand
 541                 {
 542                         add
 543                         {
 544                                 Events.AddHandler(DeleteCommandEvent, value);
 545                         }
 546                         remove
 547                         {
 548                                 Events.RemoveHandler(DeleteCommandEvent, value);
 549                         }
 550                 }
 551
 552                 [WebCategory ("Action")]
 553                 [WebSysDescription ("Raised when an edit command is generated.")]
 554                 public event DataGridCommandEventHandler EditCommand
 555                 {
 556                         add
 557                         {
 558                                 Events.AddHandler(EditCommandEvent, value);
 559                         }
 560                         remove
 561                         {
 562                                 Events.RemoveHandler(EditCommandEvent, value);
 563                         }
 564                 }
 565
 566                 [WebCategory ("Action")]
 567                 [WebSysDescription ("Raised when an item command is generated.")]
 568                 public event DataGridCommandEventHandler ItemCommand
 569                 {
 570                         add
 571                         {
 572                                 Events.AddHandler(ItemCommandEvent, value);
 573                         }
 574                         remove
 575                         {
 576                                 Events.RemoveHandler(ItemCommandEvent, value);
 577                         }
 578                 }
 579
 580                 [WebCategory ("Behavior")]
 581                 [WebSysDescription ("Raised when a new item is created.")]
 582                 public event DataGridItemEventHandler ItemCreated
 583                 {
 584                         add
 585                         {
 586                                 Events.AddHandler(ItemCreatedEvent, value);
 587                         }
 588                         remove
 589                         {
 590                                 Events.RemoveHandler(ItemCreatedEvent, value);
 591                         }
 592                 }
 593
 594                 [WebCategory ("Behavior")]
 595                 [WebSysDescription ("Raised when a item gets data-bound.")]
 596                 public event DataGridItemEventHandler ItemDataBound
 597                 {
 598                         add
 599                         {
 600                                 Events.AddHandler(ItemDataBoundEvent, value);
 601                         }
 602                         remove
 603                         {
 604                                 Events.RemoveHandler(ItemDataBoundEvent, value);
 605                         }
 606                 }
 607
 608                 [WebCategory ("Action")]
 609                 [WebSysDescription ("Raised when the currently selected page changes.")]
 610                 public event DataGridPageChangedEventHandler PageIndexChanged
 611                 {
 612                         add
 613                         {
 614                                 Events.AddHandler(PageIndexChangedEvent, value);
 615                         }
 616                         remove
 617                         {
 618                                 Events.RemoveHandler(PageIndexChangedEvent, value);
 619                         }
 620                 }
 621
 622                 [WebCategory ("Action")]
 623                 [WebSysDescription ("Raised when a sort command is generated.")]
 624                 public event DataGridSortCommandEventHandler SortCommand
 625                 {
 626                         add
 627                         {
 628                                 Events.AddHandler(SortCommandEvent, value);
 629                         }
 630                         remove
 631                         {
 632                                 Events.RemoveHandler(SortCommandEvent, value);
 633                         }
 634                 }
 635
 636                 [WebCategory ("Action")]
 637                 [WebSysDescription ("Raised when an update command is generated.")]
 638                 public event DataGridCommandEventHandler UpdateCommand
 639                 {
 640                         add
 641                         {
 642                                 Events.AddHandler(UpdateCommandEvent, value);
 643                         }
 644                         remove
 645                         {
 646                                 Events.RemoveHandler(UpdateCommandEvent, value);
 647                         }
 648                 }
 649
 650                 protected override Style CreateControlStyle()
 651                 {
 652                         TableStyle style = new TableStyle(ViewState);
 653                         style.GridLines = GridLines.Both;
 654                         style.CellSpacing = 0;
 655                         return style;
 656                 }
 657
 658                 protected override void LoadViewState(object savedState)
 659                 {
 660                         if (savedState == null)
 661                                 return;
 662
 663                         object [] states = (object []) savedState;
 664                         base.LoadViewState (states[0]);
 665                         if(columns != null)
 666                                 ((IStateManager)columns).LoadViewState(states[1]);
 667                         if(pagerStyle != null)
 668                                 pagerStyle.LoadViewState(states[2]);
 669                         if(headerStyle != null)
 670                                 headerStyle.LoadViewState(states[3]);
 671                         if(footerStyle != null)
 672                                 footerStyle.LoadViewState(states[4]);
 673                         if(itemStyle != null)
 674                                 itemStyle.LoadViewState(states[5]);
 675                         if(alternatingItemStyle != null)
 676                                 alternatingItemStyle.LoadViewState(states[6]);
 677                         if(selectedItemStyle != null)
 678                                 selectedItemStyle.LoadViewState(states[7]);
 679                         if(editItemStyle != null)
 680                                 editItemStyle.LoadViewState(states[8]);
 681
 682                         if (states [9] != null) {
 683                                 object[] array = ((object[]) states [9]);
 684                                 if (array.Length != 0)
 685                                         this.autoGenColsArrayList = new ArrayList ();
 686                                 else
 687                                         this.autoGenColsArrayList = null;
 688
 689                                 for (int i = 0; i < array.Length; i++) {
 690                                         BoundColumn column1 = new BoundColumn ();
 691                                         ((IStateManager)column1).TrackViewState ();
 692                                         ((IStateManager)column1).LoadViewState (array [i]);
 693                                         column1.SetOwner (this);
 694                                         this.autoGenColsArrayList.Add (column1);
 695                                 }
 696                         }
 697                 }
 698
 699                 protected override object SaveViewState()
 700                 {
 701                         object[] states = new object [10];
 702                         states[0] = base.SaveViewState();
 703                         states[1] = (columns == null ? null : ((IStateManager)columns).SaveViewState());
 704                         states[2] = (pagerStyle == null ? null : pagerStyle.SaveViewState());
 705                         states[3] = (headerStyle == null ? null : headerStyle.SaveViewState());
 706                         states[4] = (footerStyle == null ? null : footerStyle.SaveViewState());
 707                         states[5] = (itemStyle == null ? null : itemStyle.SaveViewState());
 708                         states[6] = (alternatingItemStyle == null ? null : alternatingItemStyle.SaveViewState());
 709                         states[7] = (selectedItemStyle == null ? null : selectedItemStyle.SaveViewState());
 710                         states[8] = (editItemStyle == null ? null : editItemStyle.SaveViewState());
 711
 712                         object [] array = null;
 713                         if ((this.autoGenColsArrayList != null) && (this.autoGenColsArrayList.Count != 0)) {
 714                                 array = new object [((uint) this.autoGenColsArrayList.Count)];
 715                                 for (int i = 0; i < array.Length; i++)
 716                                         array [i] = ((IStateManager) this.autoGenColsArrayList [i]).SaveViewState ();
 717                         }
 718
 719                         states [9] = array;
 720
 721                         for (int i = states.Length - 1; i >= 0; i--) {
 722                                 if (states [i] != null)
 723                                         return states;
 724                         }
 725
 726                         return null;
 727                 }
 728
 729                 protected override void TrackViewState()
 730                 {
 731                         base.TrackViewState();
 732                         if(alternatingItemStyle != null)
 733                         {
 734                                 alternatingItemStyle.TrackViewState();
 735                         }
 736                         if(editItemStyle != null)
 737                         {
 738                                 editItemStyle.TrackViewState();
 739                         }
 740                         if(headerStyle != null)
 741                         {
 742                                 headerStyle.TrackViewState();
 743                         }
 744                         if(footerStyle != null)
 745                         {
 746                                 footerStyle.TrackViewState();
 747                         }
 748                         if(itemStyle != null)
 749                         {
 750                                 itemStyle.TrackViewState();
 751                         }
 752                         if(selectedItemStyle != null)
 753                         {
 754                                 selectedItemStyle.TrackViewState();
 755                         }
 756                         if(pagerStyle != null)
 757                         {
 758                                 pagerStyle.TrackViewState();
 759                         }
 760
 761                         if(columns != null)
 762                         {
 763                                 ((IStateManager)columns).TrackViewState();
 764                         }
 765                 }
 766
 767                 protected override bool OnBubbleEvent(object source, EventArgs e)
 768                 {
 769                         bool retVal = false;
 770                         if(e is DataGridCommandEventArgs)
 771                         {
 772                                 DataGridCommandEventArgs ea = (DataGridCommandEventArgs)e;
 773                                 retVal = true;
 774                                 OnItemCommand(ea);
 775                                 string cmd = ea.CommandName;
 776                                 if(String.Compare(cmd, "select", true) == 0)
 777                                 {
 778                                         SelectedIndex = ea.Item.ItemIndex;
 779                                         OnSelectedIndexChanged(EventArgs.Empty);
 780                                 } else if(String.Compare(cmd,"page", true) == 0)
 781                                 {
 782                                         int    cIndex = CurrentPageIndex;
 783                                         string cea = (string) ea.CommandArgument;
 784                                         if(String.Compare(cea, "prev", true) == 0)
 785                                         {
 786                                                 cIndex--;
 787                                         } else if(String.Compare(cea, "next", true) == 0)
 788                                         {
 789                                                 cIndex++;
 790                                         } else {
 791                                                 cIndex = Convert.ToInt32 (cea) - 1;
 792                                         }
 793
 794                                         OnPageIndexChanged(new DataGridPageChangedEventArgs(source, cIndex));
 795                                 } else if(String.Compare(cmd, "sort", true) == 0)
 796                                 {
 797                                         OnSortCommand(new DataGridSortCommandEventArgs(source, ea));
 798                                 } else if(String.Compare(cmd, "edit", true) == 0)
 799                                 {
 800                                         OnEditCommand(ea);
 801                                 } else if(String.Compare(cmd, "update", true) == 0)
 802                                 {
 803                                         OnUpdateCommand(ea);
 804                                 } else if(String.Compare(cmd, "cancel", true) == 0)
 805                                 {
 806                                         OnCancelCommand(ea);
 807                                 } else if(String.Compare(cmd, "delete", true) == 0)
 808                                 {
 809                                         OnDeleteCommand(ea);
 810                                 }
 811                         }
 812                         return retVal;
 813                 }
 814
 815                 protected virtual void OnCancelCommand(DataGridCommandEventArgs e)
 816                 {
 817                         if(Events != null)
 818                         {
 819                                 DataGridCommandEventHandler dceh = (DataGridCommandEventHandler)(Events[CancelCommandEvent]);
 820                                 if(dceh != null)
 821                                         dceh(this, e);
 822                         }
 823                 }
 824
 825                 protected virtual void OnDeleteCommand(DataGridCommandEventArgs e)
 826                 {
 827                         if(Events != null)
 828                         {
 829                                 DataGridCommandEventHandler dceh = (DataGridCommandEventHandler)(Events[DeleteCommandEvent]);
 830                                 if(dceh != null)
 831                                         dceh(this, e);
 832                         }
 833                 }
 834
 835                 protected virtual void OnEditCommand(DataGridCommandEventArgs e)
 836                 {
 837                         if(Events != null)
 838                         {
 839                                 DataGridCommandEventHandler dceh = (DataGridCommandEventHandler)(Events[EditCommandEvent]);
 840                                 if(dceh != null)
 841                                         dceh(this, e);
 842                         }
 843                 }
 844
 845                 protected virtual void OnItemCommand(DataGridCommandEventArgs e)
 846                 {
 847                         if(Events != null)
 848                         {
 849                                 DataGridCommandEventHandler dceh = (DataGridCommandEventHandler)(Events[ItemCommandEvent]);
 850                                 if(dceh != null)
 851                                         dceh(this, e);
 852                         }
 853                 }
 854
 855                 protected virtual void OnItemCreated(DataGridItemEventArgs e)
 856                 {
 857                         if(Events != null)
 858                         {
 859                                 DataGridItemEventHandler dceh = (DataGridItemEventHandler)(Events[ItemCreatedEvent]);
 860                                 if(dceh != null)
 861                                         dceh(this, e);
 862                         }
 863                 }
 864
 865                 protected virtual void OnItemDataBound(DataGridItemEventArgs e)
 866                 {
 867                         if(Events != null)
 868                         {
 869                                 DataGridItemEventHandler dceh = (DataGridItemEventHandler)(Events[ItemDataBoundEvent]);
 870                                 if(dceh != null)
 871                                         dceh(this, e);
 872                         }
 873                 }
 874
 875                 protected virtual void OnPageIndexChanged(DataGridPageChangedEventArgs e)
 876                 {
 877                         if(Events != null)
 878                         {
 879                                 DataGridPageChangedEventHandler dceh = (DataGridPageChangedEventHandler)(Events[PageIndexChangedEvent]);
 880                                 if(dceh != null)
 881                                         dceh(this, e);
 882                         }
 883                 }
 884
 885                 protected virtual void OnSortCommand(DataGridSortCommandEventArgs e)
 886                 {
 887                         if(Events != null)
 888                         {
 889                                 DataGridSortCommandEventHandler dceh = (DataGridSortCommandEventHandler)(Events[SortCommandEvent]);
 890                                 if(dceh != null)
 891                                         dceh(this, e);
 892                         }
 893                 }
 894
 895                 protected virtual void OnUpdateCommand(DataGridCommandEventArgs e)
 896                 {
 897                         if(Events != null)
 898                         {
 899                                 DataGridCommandEventHandler dceh = (DataGridCommandEventHandler)(Events[UpdateCommandEvent]);
 900                                 if(dceh != null)
 901                                         dceh(this, e);
 902                         }
 903                 }
 904
 905                 protected override void PrepareControlHierarchy()
 906                 {
 907                         if (Controls.Count == 0)
 908                                 return;
 909
 910                         Table display = (Table) Controls [0];
 911                         display.CopyBaseAttributes (this);
 912                         if (ControlStyleCreated) {
 913                                 display.ApplyStyle (ControlStyle);
 914                         } else {
 915                                 display.GridLines   = GridLines.Both;
 916                                 display.CellSpacing = 0;
 917                         }
 918
 919                         TableRowCollection rows = display.Rows;
 920                         if (rows.Count == 0)
 921                                 return;
 922
 923                         int nCols = Columns.Count;
 924                         DataGridColumn [] cols = new DataGridColumn [nCols];
 925                         Style deployStyle = null;
 926
 927                         if (nCols > 0)
 928                                 Columns.CopyTo (cols, 0);
 929
 930                         if (alternatingItemStyle != null) {
 931                                 deployStyle = new TableItemStyle ();
 932                                 deployStyle.CopyFrom (itemStyle);
 933                                 deployStyle.CopyFrom (alternatingItemStyle);
 934                         } else {
 935                                 deployStyle = itemStyle;
 936                         }
 937
 938                         int nrows = rows.Count;
 939                         for (int counter = 0; counter < nrows; counter++)
 940                                 PrepareControlHierarchyForItem (cols,
 941                                                                 (DataGridItem) rows [counter],
 942                                                                 counter,
 943                                                                 deployStyle);
 944                 }
 945
 946                 private void PrepareControlHierarchyForItem (DataGridColumn [] cols,
 947                                                              DataGridItem item,
 948                                                              int index,
 949                                                              Style deployStyle)
 950                 {
 951                         switch (item.ItemType) {
 952                         case ListItemType.Header:
 953                                 if (!ShowHeader) {
 954                                         item.Visible = false;
 955                                         break;
 956                                 }
 957
 958                                 if (headerStyle != null)
 959                                         item.MergeStyle (headerStyle);
 960
 961                                 goto case ListItemType.Separator;
 962                         case ListItemType.Footer:
 963                                 if (!ShowFooter) {
 964                                         item.Visible = false;
 965                                         break;
 966                                 }
 967
 968                                 if (footerStyle != null)
 969                                         item.MergeStyle (footerStyle);
 970
 971                                 goto case ListItemType.Separator;
 972                         case ListItemType.Item  :
 973                                 item.MergeStyle (itemStyle);
 974                                 goto case ListItemType.Separator;
 975                         case ListItemType.AlternatingItem:
 976                                 item.MergeStyle (deployStyle);
 977                                 goto case ListItemType.Separator;
 978                         case ListItemType.SelectedItem:
 979                                 Style selStyle = new TableItemStyle ();
 980                                 if ((item.ItemIndex % 2) == 0) {
 981                                         selStyle.CopyFrom (itemStyle);
 982                                 } else {
 983                                         selStyle.CopyFrom (deployStyle);
 984                                 }
 985
 986                                 selStyle.CopyFrom (selectedItemStyle);
 987                                 item.MergeStyle (selStyle);
 988                                 goto case ListItemType.Separator;
 989                         case ListItemType.EditItem:
 990                                 Style edStyle = new TableItemStyle ();
 991                                 if ((item.ItemIndex % 2) == 0) {
 992                                         edStyle.CopyFrom (itemStyle);
 993                                 } else {
 994                                         edStyle.CopyFrom (deployStyle);
 995                                 }
 996
 997                                 edStyle.CopyFrom (editItemStyle);
 998                                 item.MergeStyle (edStyle);
 999                                 goto case ListItemType.Separator;
1000                         case ListItemType.Pager:
1001                                 if (pagerStyle == null)
1002                                         break;
1003
1004                                 if (!pagerStyle.Visible)
1005                                         item.Visible = false;
1006
1007                                 if (index == 0) {
1008                                         if (!pagerStyle.IsPagerOnTop) {
1009                                                 item.Visible = false;
1010                                                 break;
1011                                         }
1012                                 } else if (!pagerStyle.IsPagerOnBottom) {
1013                                         item.Visible = false;
1014                                         break;
1015                                 }
1016
1017                                 item.MergeStyle (pagerStyle);
1018                                 goto case ListItemType.Separator;
1019                         case ListItemType.Separator:
1020                                 TableCellCollection cells = item.Cells;
1021                                 int cellCount = cells.Count;
1022                                 if (cellCount > cols.Length)
1023                                         cellCount = cols.Length;
1024
1025                                 if (cellCount > 0 && item.ItemType != ListItemType.Pager) {
1026                                         for (int i = 0; i < cellCount; i++) {
1027                                                 Style colStyle = null;
1028                                                 if (cols [i].Visible) {
1029                                                         switch (item.ItemType) {
1030                                                         case ListItemType.Header:
1031                                                                 colStyle = cols [i].HeaderStyleInternal;
1032                                                                 break;
1033                                                         case ListItemType.Footer:
1034                                                                 colStyle = cols [i].FooterStyleInternal;
1035                                                                 break;
1036                                                         default:
1037                                                                 colStyle = cols [i].ItemStyleInternal;
1038                                                                 break;
1039                                                         }
1040                                                         cells[i].MergeStyle (colStyle);
1041                                                 } else {
1042                                                         cells [i].Visible = false;
1043                                                 }
1044                                         }
1045                                 }
1046                                 break;
1047                         default:
1048                                 goto case ListItemType.Separator;
1049                         }
1050                 }
1051
1052                 protected override void CreateControlHierarchy(bool useDataSource)
1053                 {
1054                         IEnumerator pageSourceEnumerator;
1055                         int         itemCount;
1056                         ArrayList   dataKeys;
1057                         ArrayList   columns;
1058                         IEnumerable resolvedDS;
1059                         ICollection collResolvedDS;
1060                         int         pageDSCount;
1061                         int         colCount;
1062                         DataGridColumn[] cols;
1063                         Table       deployTable;
1064                         TableRowCollection deployRows;
1065                         ListItemType deployType;
1066                         int         indexCounter;
1067                         string      dkField;
1068                         bool        dsUse;
1069                         bool        pgEnabled;
1070                         int         editIndex;
1071                         int         selIndex;
1072
1073                         pagedDataSource = CreatePagedDataSource();
1074                         pageSourceEnumerator  = null;
1075                         itemCount       = -1;
1076                         dataKeys        = DataKeysArray;
1077                         columns         = null;
1078                         if(itemsArrayList != null)
1079                         {
1080                                 itemsArrayList.Clear();
1081                         } else
1082                         {
1083                                 itemsArrayList = new ArrayList();
1084                         }
1085                         if(!useDataSource)
1086                         {
1087                                 itemCount    = (int) ViewState["_!ItemCount"];
1088                                 pageDSCount  = (int) ViewState["_!DataSource_ItemCount"];
1089                                 if(itemCount != -1)
1090                                 {
1091                                         if(pagedDataSource.IsCustomPagingEnabled)
1092                                         {
1093                                                 pagedDataSource.DataSource = new DataSourceInternal(itemCount);
1094                                         } else
1095                                         {
1096                                                 pagedDataSource.DataSource = new DataSourceInternal(pageDSCount);
1097                                         }
1098                                         pageSourceEnumerator = pagedDataSource.GetEnumerator();
1099                                         columns              = CreateColumnSet(null, false);
1100                                         itemsArrayList.Capacity = itemCount;
1101                                 }
1102                         } else
1103                         {
1104                                 dataKeys.Clear();
1105                                 resolvedDS = GetResolvedDataSource ();
1106                                 if(resolvedDS != null)
1107                                 {
1108                                         collResolvedDS = resolvedDS as ICollection;
1109                                         if(pagedDataSource.IsPagingEnabled && !pagedDataSource.IsCustomPagingEnabled
1110                                            && collResolvedDS == null)
1111                                         {
1112                                                 throw new HttpException(HttpRuntime.FormatResourceString("DataGrid_Missing_VirtualItemCount", ID));
1113                                         }
1114                                         pagedDataSource.DataSource = resolvedDS;
1115                                         if(pagedDataSource.IsPagingEnabled && (pagedDataSource.CurrentPageIndex < 0 ||
1116                                                         pagedDataSource.PageCount < pagedDataSource.CurrentPageIndex))
1117                                         {
1118                                                 throw new HttpException(HttpRuntime.FormatResourceString("DataGrid_Invalid_Current_PageIndex", ID));
1119                                         }
1120                                         columns = CreateColumnSet(pagedDataSource, useDataSource);
1121
1122                                         if(storedDataValid)
1123                                         {
1124                                                 pageSourceEnumerator = storedData;
1125                                         } else
1126                                         {
1127                                                 pageSourceEnumerator = pagedDataSource.GetEnumerator();
1128                                         }
1129                                         if(collResolvedDS != null)
1130                                         {
1131                                                 pageDSCount         = pagedDataSource.Count;
1132                                                 dataKeys.Capacity   = pageDSCount;
1133                                                 itemsArrayList.Capacity = pageDSCount;
1134                                         }
1135                                 }
1136                         }
1137
1138                         colCount = 0;
1139                         if(columns != null)
1140                                 colCount = columns.Count;
1141                         int currentSourceIndex;
1142                         if(colCount > 0)
1143                         {
1144                                 cols = (DataGridColumn []) columns.ToArray (typeof (DataGridColumn));
1145                                 foreach(DataGridColumn current in cols)
1146                                 {
1147                                         current.Initialize();
1148                                 }
1149                                 deployTable = new DataGridTableInternal();
1150                                 Controls.Add(deployTable);
1151                                 deployRows = deployTable.Rows;
1152
1153                                 indexCounter = 0;
1154                                 currentSourceIndex  = 0;
1155                                 dkField = DataKeyField;
1156
1157                                 dsUse = (useDataSource) ? (dkField.Length > 0) : false;
1158                                 pgEnabled = pagedDataSource.IsPagingEnabled;
1159                                 editIndex = EditItemIndex;
1160                                 selIndex  = SelectedIndex;
1161                                 if(pgEnabled)
1162                                 {
1163                                         currentSourceIndex = pagedDataSource.FirstIndexInPage;
1164                                         CreateItem(-1, -1, ListItemType.Pager, false, null,
1165                                                    cols, deployRows, pagedDataSource);
1166                                 }
1167                                 itemCount = 0;
1168                                 CreateItem(-1, -1, ListItemType.Header, useDataSource, null,
1169                                            cols, deployRows, null);
1170
1171                                 if(storedDataValid && storedDataFirst != null)
1172                                 {
1173                                         if(dsUse)
1174                                         {
1175                                                 dataKeys.Add(DataBinder.GetPropertyValue(storedDataFirst, dkField));
1176                                         }
1177                                         if (indexCounter == editIndex) {
1178                                                 deployType = ListItemType.EditItem;
1179                                         } else if (indexCounter == selIndex) {
1180                                                 deployType = ListItemType.SelectedItem;
1181                                         } else {
1182                                                 deployType = ListItemType.Item;
1183                                         }
1184
1185                                         itemsArrayList.Add(CreateItem(0, currentSourceIndex, deployType,
1186                                                                       useDataSource, storedDataFirst,
1187                                                                       cols, deployRows, null));
1188                                         itemCount++;
1189                                         indexCounter++;
1190                                         currentSourceIndex++;
1191                                         storedDataValid = false;
1192                                         storedDataFirst = null;
1193                                 }
1194
1195                                 while(pageSourceEnumerator.MoveNext())
1196                                 {
1197                                         object current = pageSourceEnumerator.Current;
1198                                         if(dsUse)
1199                                         {
1200                                                 dataKeys.Add(DataBinder.GetPropertyValue(current, dkField));
1201                                         }
1202
1203                                         if (indexCounter == editIndex) {
1204                                                 deployType = ListItemType.EditItem;
1205                                         } else if (indexCounter == selIndex) {
1206                                                 deployType = ListItemType.SelectedItem;
1207                                         } else if ((indexCounter % 2) == 1) {
1208                                                 deployType = ListItemType.AlternatingItem;
1209                                         } else {
1210                                                 deployType = ListItemType.Item;
1211                                         }
1212
1213                                         itemsArrayList.Add(CreateItem(indexCounter, currentSourceIndex,
1214                                                                       deployType, useDataSource, current,
1215                                                                       cols, deployRows, null));
1216                                         itemCount++;
1217                                         indexCounter++;
1218                                         currentSourceIndex++;
1219                                 }
1220
1221                                 CreateItem(-1, -1, ListItemType.Footer, useDataSource, null,
1222                                            cols, deployRows, null);
1223
1224                                 if(pgEnabled)
1225                                 {
1226                                         CreateItem(-1, -1, ListItemType.Pager, false, null, cols, deployRows,
1227                                                    pagedDataSource);
1228                                 }
1229                         }
1230
1231                         if(useDataSource)
1232                         {
1233                                 if(pageSourceEnumerator != null)
1234                                 {
1235                                         ViewState["_!ItemCount"] = itemCount;
1236                                         if(pagedDataSource.IsPagingEnabled)
1237                                         {
1238                                                 ViewState["PageCount"] = pagedDataSource.PageCount;
1239                                                 ViewState["_!DataSource_ItemCount"] = pagedDataSource.DataSourceCount;
1240                                         } else
1241                                         {
1242                                                 ViewState["PageCount"] = 1;
1243                                                 ViewState["_!DataSource_ItemCount"] = itemCount;
1244                                         }
1245                                 } else
1246                                 {
1247                                         ViewState["_!ItemCount"] = -1;
1248                                         ViewState["_!DataSource_ItemCount"] = -1;
1249                                         ViewState["PageCount"] = 0;
1250                                 }
1251                         }
1252                         pagedDataSource = null;
1253                 }
1254
1255                 private DataGridItem CreateItem(int itemIndex, int dsIndex, ListItemType type,
1256                                                 bool bind, object item, DataGridColumn[] columns,
1257                                                 TableRowCollection rows, PagedDataSource dataSrc)
1258
1259                 {
1260                         DataGridItem retVal;
1261                         DataGridItemEventArgs args;
1262
1263                         retVal = CreateItem(itemIndex, dsIndex, type);
1264                         args = new DataGridItemEventArgs(retVal);
1265
1266                         if(type != ListItemType.Pager)
1267                         {
1268                                 InitializeItem(retVal, columns);
1269                                 if(bind)
1270                                 {
1271                                         retVal.DataItem = item;
1272                                 }
1273                                 OnItemCreated(args);
1274                                 rows.Add(retVal);
1275                                 if(bind)
1276                                 {
1277                                         retVal.DataBind();
1278                                         OnItemDataBound(args);
1279                                         retVal.DataItem = null;
1280                                 }
1281                         } else
1282                         {
1283                                 InitializePager(retVal, columns.Length, dataSrc);
1284                                 OnItemCreated(args);
1285                                 rows.Add(retVal);
1286                         }
1287                         return retVal;
1288                 }
1289
1290                 protected virtual DataGridItem CreateItem(int itemIndex, int dataSourceIndex, ListItemType itemType)
1291                 {
1292                         return new DataGridItem(itemIndex, dataSourceIndex, itemType);
1293                 }
1294
1295                 protected virtual void InitializeItem(DataGridItem item, DataGridColumn[] columns)
1296                 {
1297                         TableCellCollection cells = item.Cells;
1298                         TableCell cCell;
1299
1300                         for(int i = 0; i < columns.Length; i++)
1301                         {
1302                                 cCell = new TableCell();
1303                                 columns[i].InitializeCell(cCell, i, item.ItemType);
1304                                 cells.Add(cCell);
1305                         }
1306                 }
1307
1308                 protected virtual void InitializePager(DataGridItem item,
1309                                        int columnSpan, PagedDataSource pagedDataSource)
1310                 {
1311                         TableCell toAdd = new TableCell();
1312                         toAdd.ColumnSpan = columnSpan;
1313
1314                         if(PagerStyle.Mode == PagerMode.NextPrev)
1315                         {
1316                                 if(!pagedDataSource.IsFirstPage)
1317                                 {
1318                                         LinkButton link = new DataGridLinkButton();
1319                                         link.Text = PagerStyle.PrevPageText;
1320                                         link.CommandName = "Page";
1321                                         link.CommandArgument = "Prev";
1322                                         link.CausesValidation = false;
1323                                         toAdd.Controls.Add(link);
1324                                 } else
1325                                 {
1326                                         Label label = new Label();
1327                                         label.Text = PagerStyle.PrevPageText;
1328                                         toAdd.Controls.Add(label);
1329                                 }
1330                                 toAdd.Controls.Add(new LiteralControl("&nbsp;"));
1331
1332                                 if (pagedDataSource.PageCount == 0) {
1333                                         Label label = new Label();
1334                                         label.Text = PagerStyle.NextPageText;
1335                                         toAdd.Controls.Add(label);
1336                                 } else {
1337                                         if(!pagedDataSource.IsLastPage)
1338                                         {
1339                                                 LinkButton link = new DataGridLinkButton();
1340                                                 link.Text = PagerStyle.NextPageText;
1341                                                 link.CommandName = "Page";
1342                                                 link.CommandArgument = "Next";
1343                                                 link.CausesValidation = false;
1344                                                 toAdd.Controls.Add(link);
1345                                         } else
1346                                         {
1347                                                 Label label = new Label();
1348                                                 label.Text = PagerStyle.NextPageText;
1349                                                 toAdd.Controls.Add(label);
1350                                         }
1351                                 }
1352                         } else
1353                         {
1354                                 int pageCount = pagedDataSource.PageCount;
1355                                 int currPage  = pagedDataSource.CurrentPageIndex + 1;
1356                                 int btnCount  = PagerStyle.PageButtonCount;
1357                                 int numberOfPages = btnCount;
1358                                 if(numberOfPages > pageCount)
1359                                         numberOfPages = pageCount;
1360                                 int firstPageNumber = 1; // 10
1361                                 int lastPageNumber  = numberOfPages; // 11
1362
1363                                 if(currPage > lastPageNumber)
1364                                 {
1365                                         firstPageNumber = (pagedDataSource.CurrentPageIndex / btnCount) * btnCount + 1;
1366                                         lastPageNumber  = firstPageNumber + btnCount - 1;
1367                                         if(lastPageNumber > pageCount)
1368                                                 lastPageNumber = pageCount;
1369                                         if((lastPageNumber - firstPageNumber + 1) < btnCount)
1370                                                 firstPageNumber = Math.Max(1, lastPageNumber - btnCount + 1);
1371                                 }
1372                                 if(firstPageNumber != 1)
1373                                 {
1374                                         LinkButton toAddBtn = new DataGridLinkButton();
1375                                         toAddBtn.Text = "...";
1376                                         toAddBtn.CommandName = "Page";
1377                                         toAddBtn.CommandArgument = (firstPageNumber - 1).ToString(NumberFormatInfo.InvariantInfo);
1378                                         toAddBtn.CausesValidation = false;
1379                                         toAdd.Controls.Add(toAddBtn);
1380                                         toAdd.Controls.Add(new LiteralControl("&nbsp;"));
1381                                 }
1382                                 if (lastPageNumber == 0) {
1383                                         Label cPageLabel = new Label();
1384                                         cPageLabel.Text = "1";
1385                                         toAdd.Controls.Add(cPageLabel);
1386                                 } else {
1387                                         for(int i = firstPageNumber; i <= lastPageNumber; i++)
1388                                         {
1389                                                 string argText = i.ToString(NumberFormatInfo.InvariantInfo);
1390                                                 if(i == currPage)
1391                                                 {
1392                                                         Label cPageLabel = new Label();
1393                                                         cPageLabel.Text = argText;
1394                                                         toAdd.Controls.Add(cPageLabel);
1395                                                 } else
1396                                                 {
1397                                                         LinkButton indexButton = new DataGridLinkButton();
1398                                                         indexButton.Text = argText;
1399                                                         indexButton.CommandName = "Page";
1400                                                         indexButton.CommandArgument = argText;
1401                                                         indexButton.CausesValidation = false;
1402                                                         toAdd.Controls.Add(indexButton);
1403                                                 }
1404                                                 if(i < lastPageNumber)
1405                                                         toAdd.Controls.Add(new LiteralControl("&nbsp;"));
1406                                         }
1407                                 }
1408                                 if(pageCount > lastPageNumber)
1409                                 {
1410                                         toAdd.Controls.Add(new LiteralControl("&nbsp;"));
1411                                         LinkButton contLink = new DataGridLinkButton();
1412                                         contLink.Text = "...";
1413                                         contLink.CommandName = "Page";
1414                                         contLink.CommandArgument = (lastPageNumber + 1).ToString(NumberFormatInfo.InvariantInfo);
1415                                         contLink.CausesValidation = false;
1416                                         toAdd.Controls.Add(contLink);
1417                                 }
1418                         }
1419                         item.Cells.Add(toAdd);
1420                 }
1421
1422                 private PagedDataSource CreatePagedDataSource()
1423                 {
1424                         PagedDataSource retVal;
1425
1426                         retVal = new PagedDataSource();
1427                         retVal.CurrentPageIndex = CurrentPageIndex;
1428                         retVal.PageSize         = PageSize;
1429                         retVal.AllowPaging      = AllowPaging;
1430                         retVal.AllowCustomPaging = AllowCustomPaging;
1431                         retVal.VirtualCount      = VirtualItemCount;
1432
1433                         return retVal;
1434                 }
1435
1436                 ///<summary>
1437                 /// UnDocumented method
1438                 /// </summary>
1439                 protected virtual ArrayList CreateColumnSet(PagedDataSource source, bool useDataSource)
1440                 {
1441                         DataGridColumn[] cols = new DataGridColumn [Columns.Count];
1442                         Columns.CopyTo (cols, 0);
1443                         ArrayList l_columns = new ArrayList ();
1444
1445                         foreach (DataGridColumn current in cols)
1446                                 l_columns.Add (current);
1447
1448                         if (AutoGenerateColumns) {
1449                                 ArrayList auto_columns = null;
1450                                 if (useDataSource) {
1451                                         auto_columns = AutoCreateColumns (source);
1452                                         autoGenColsArrayList = auto_columns;
1453                                 } else {
1454                                         auto_columns = autoGenColsArrayList;
1455                                 }
1456
1457                                 if (auto_columns != null && auto_columns.Count > 0)
1458                                         l_columns.AddRange (auto_columns);
1459                         }
1460
1461                         return l_columns;
1462                 }
1463
1464                 /// <summary>
1465                 /// Generates the columns when AutoGenerateColumns is true.
1466                 /// This method is called by CreateColumnSet when dataSource
1467                 /// is to be used and columns need to be generated automatically.
1468                 /// </summary>
1469                 private ArrayList AutoCreateColumns(PagedDataSource source)
1470                 {
1471                         if(source != null)
1472                         {
1473                                 ArrayList retVal = new ArrayList();
1474                                 PropertyDescriptorCollection props = source.GetItemProperties(new PropertyDescriptor[0]);
1475                                 Type      prop_type;
1476                                 BoundColumn b_col;
1477                                 if(props == null)
1478                                 {
1479                                         object fitem = null;
1480                                         prop_type   = null;
1481                                         PropertyInfo prop_item =  source.DataSource.GetType().GetProperty("Item",
1482                                                   BindingFlags.Instance | BindingFlags.Static |
1483                                                   BindingFlags.Public, null, null,
1484                                                   new Type[] { typeof(int) }, null);
1485
1486                                         if(prop_item != null)
1487                                         {
1488                                                 prop_type = prop_item.PropertyType;
1489                                         }
1490                                         if(prop_type == null || prop_type == typeof(object))
1491                                         {
1492
1493                                                 IEnumerator en = source.GetEnumerator();
1494                                                 if(en.MoveNext())
1495                                                         fitem = en.Current;
1496                                                 if(fitem != null)
1497                                                 {
1498                                                         prop_type = fitem.GetType();
1499                                                 }
1500                                                 StoreEnumerator(en, fitem);
1501                                         }
1502
1503                                         if(fitem != null && fitem is ICustomTypeDescriptor)
1504                                         {
1505                                                 props = TypeDescriptor.GetProperties(fitem);
1506                                         } else if(prop_type != null) {
1507                                                 if(IsBindableType(prop_type))
1508                                                 {
1509                                                         b_col = new BoundColumn();
1510                                                         ((IStateManager)b_col).TrackViewState();
1511                                                         b_col.HeaderText = "Item";
1512                                                         b_col.SortExpression = "Item";
1513                                                         b_col.DataField  = BoundColumn.thisExpr;
1514                                                         b_col.SetOwner(this);
1515                                                         retVal.Add(b_col);
1516                                                 } else
1517                                                 {
1518                                                         props = TypeDescriptor.GetProperties(prop_type);
1519                                                 }
1520                                         }
1521
1522                                 }
1523                                 if(props != null && props.Count > 0)
1524                                 {
1525                                         //IEnumerable p_en = props.GetEnumerator();
1526                                         try
1527                                         {
1528                                                 foreach(PropertyDescriptor current in props)
1529                                                 {
1530                                                         if(IsBindableType(current.PropertyType))
1531                                                         {
1532                                                                 b_col = new BoundColumn();
1533                                                                 ((IStateManager)b_col).TrackViewState();
1534                                                                 b_col.HeaderText     = current.Name;
1535                                                                 b_col.SortExpression = current.Name;
1536                                                                 b_col.DataField      = current.Name;
1537                                                                 b_col.ReadOnly     = current.IsReadOnly;
1538                                                                 b_col.SetOwner(this);
1539                                                                 retVal.Add(b_col);
1540                                                         }
1541                                                 }
1542                                         } finally
1543                                         {
1544                                                 if(props is IDisposable)
1545                                                         ((IDisposable)props).Dispose();
1546                                         }
1547                                 }
1548                                 if(retVal.Count > 0)
1549                                 {
1550                                         return retVal;
1551                                 }
1552                                 throw new HttpException(HttpRuntime.FormatResourceString("DataGrid_NoAutoGenColumns", ID));
1553                         }
1554                         return null;
1555                 }
1556
1557                 internal void StoreEnumerator(IEnumerator source, object firstItem)
1558                 {
1559                         storedData      = source;
1560                         storedDataFirst = firstItem;
1561                         storedDataValid = true;
1562                 }
1563
1564                 internal void OnColumnsChanged()
1565                 {
1566                 }
1567
1568                 internal void OnPagerChanged()
1569                 {
1570                 }
1571         }
1572 }