mcs/class/corlib/System.IO/File.cs

   1 //
   2 // System.IO.File.cs
   3 //
   4 //
   5 // Authors:
   6 //   Miguel de Icaza (miguel@ximian.com)
   7 //   Jim Richardson  (develop@wtfo-guru.com)
   8 //   Dan Lewis       (dihlewis@yahoo.co.uk)
   9 //   Ville Palo      (vi64pa@kolumbus.fi)
  10 //
  11 // Copyright 2002 Ximian, Inc. http://www.ximian.com
  12 // Copyright (C) 2001 Moonlight Enterprises, All Rights Reserved
  13 // Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System;
  36 using System.Text;
  37 #if NET_2_0
  38 using System.Collections.Generic;
  39 using System.Runtime.InteropServices;
  40 #endif
  41 #if NET_2_0 && !NET_2_1
  42 using System.Security.AccessControl;
  43 #endif
  44
  45 namespace System.IO
  46 {
  47 #if NET_2_0
  48         [ComVisible (true)]
  49 #endif
  50         public
  51 #if NET_2_0
  52         static
  53 #else
  54         sealed
  55 #endif
  56         class File
  57         {
  58
  59 #if !NET_2_0
  60                 private File () {}
  61 #endif
  62
  63 #if NET_2_0
  64                 public static void AppendAllText (string path, string contents)
  65                 {
  66                         using (TextWriter w = new StreamWriter (path, true)) {
  67                                 w.Write (contents);
  68                         }
  69                 }
  70
  71                 public static void AppendAllText (string path, string contents, Encoding encoding)
  72                 {
  73                         using (TextWriter w = new StreamWriter (path, true, encoding)) {
  74                                 w.Write (contents);
  75                         }
  76                 }
  77 #endif
  78
  79                 public static StreamWriter AppendText (string path)
  80                 {
  81                         return new StreamWriter (path, true);
  82                 }
  83
  84                 public static void Copy (string sourceFileName, string destFileName)
  85                 {
  86                         Copy (sourceFileName, destFileName, false);
  87                 }
  88
  89                 public static void Copy (string sourceFileName, string destFileName, bool overwrite)
  90                 {
  91                         MonoIOError error;
  92
  93                         if (sourceFileName == null)
  94                                 throw new ArgumentNullException ("sourceFileName");
  95                         if (destFileName == null)
  96                                 throw new ArgumentNullException ("destFileName");
  97                         if (sourceFileName.Length == 0)
  98                                 throw new ArgumentException ("An empty file name is not valid.", "sourceFileName");
  99                         if (sourceFileName.Trim ().Length == 0 || sourceFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 100                                 throw new ArgumentException ("The file name is not valid.");
 101                         if (destFileName.Length == 0)
 102                                 throw new ArgumentException ("An empty file name is not valid.", "destFileName");
 103                         if (destFileName.Trim ().Length == 0 || destFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 104                                 throw new ArgumentException ("The file name is not valid.");
 105
 106                         if (!MonoIO.Exists (sourceFileName, out error))
 107                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", sourceFileName), sourceFileName);
 108                         if ((GetAttributes (sourceFileName) & FileAttributes.Directory) == FileAttributes.Directory)
 109                                 throw new ArgumentException (Locale.GetText ("{0} is a directory", sourceFileName));
 110
 111                         if (MonoIO.Exists (destFileName, out error)) {
 112                                 if ((GetAttributes (destFileName) & FileAttributes.Directory) == FileAttributes.Directory)
 113                                         throw new ArgumentException (Locale.GetText ("{0} is a directory", destFileName));
 114                                 if (!overwrite)
 115                                         throw new IOException (Locale.GetText ("{0} already exists", destFileName));
 116                         }
 117
 118                         string DirName = Path.GetDirectoryName (destFileName);
 119                         if (DirName != String.Empty && !Directory.Exists (DirName))
 120                                 throw new DirectoryNotFoundException (Locale.GetText ("Destination directory not found: {0}",DirName));
 121
 122                         if (!MonoIO.CopyFile (sourceFileName, destFileName, overwrite, out error)) {
 123                                 string p = Locale.GetText ("{0}\" or \"{1}", sourceFileName, destFileName);
 124                                 throw MonoIO.GetException (p, error);
 125                         }
 126                 }
 127
 128                 public static FileStream Create (string path)
 129                 {
 130                         return Create (path, 8192);
 131                 }
 132
 133                 public static FileStream Create (string path, int bufferSize)
 134                 {
 135                         return new FileStream (path, FileMode.Create, FileAccess.ReadWrite,
 136                                 FileShare.None, bufferSize);
 137                 }
 138
 139 #if NET_2_0 && !NET_2_1
 140                 [MonoTODO ("options not implemented")]
 141                 public static FileStream Create (string path, int bufferSize,
 142                                                  FileOptions options)
 143                 {
 144                         return Create (path, bufferSize, options, null);
 145                 }
 146
 147                 [MonoTODO ("options and fileSecurity not implemented")]
 148                 public static FileStream Create (string path, int bufferSize,
 149                                                  FileOptions options,
 150                                                  FileSecurity fileSecurity)
 151                 {
 152                         return new FileStream (path, FileMode.Create, FileAccess.ReadWrite,
 153                                 FileShare.None, bufferSize, options);
 154                 }
 155 #endif
 156
 157                 public static StreamWriter CreateText (string path)
 158                 {
 159                         return new StreamWriter (path, false);
 160                 }
 161
 162                 public static void Delete (string path)
 163                 {
 164                         if (path == null)
 165                                 throw new ArgumentNullException("path");
 166                         if (path.Trim().Length == 0 || path.IndexOfAny(Path.InvalidPathChars) >= 0)
 167                                 throw new ArgumentException("path");
 168                         if (Directory.Exists (path))
 169                                 throw new UnauthorizedAccessException(Locale.GetText ("{0} is a directory", path));
 170
 171                         string DirName = Path.GetDirectoryName(path);
 172                         if (DirName != String.Empty && !Directory.Exists (DirName))
 173                                 throw new DirectoryNotFoundException (Locale.GetText ("Could not find a part of the path \"{0}\".", path));
 174
 175                         MonoIOError error;
 176
 177                         if (!MonoIO.DeleteFile (path, out error)){
 178                                 if (error != MonoIOError.ERROR_FILE_NOT_FOUND)
 179                                         throw MonoIO.GetException (path, error);
 180                         }
 181                 }
 182
 183                 public static bool Exists (string path)
 184                 {
 185                         // For security reasons no exceptions are
 186                         // thrown, only false is returned if there is
 187                         // any problem with the path or permissions.
 188                         // Minimizes what information can be
 189                         // discovered by using this method.
 190                         if (path == null || path.Trim().Length == 0
 191                             || path.IndexOfAny(Path.InvalidPathChars) >= 0) {
 192                                 return false;
 193                         }
 194
 195                         MonoIOError error;
 196                         return MonoIO.ExistsFile (path, out error);
 197                 }
 198
 199 #if NET_2_0 && !NET_2_1
 200                 public static FileSecurity GetAccessControl (string path)
 201                 {
 202                         throw new NotImplementedException ();
 203                 }
 204
 205                 public static FileSecurity GetAccessControl (string path, AccessControlSections includeSections)
 206                 {
 207                         throw new NotImplementedException ();
 208                 }
 209 #endif
 210
 211                 public static FileAttributes GetAttributes (string path)
 212                 {
 213                         if (path == null)
 214                                 throw new ArgumentNullException("path");
 215                         if (path.Trim ().Length == 0)
 216                                 throw new ArgumentException (Locale.GetText ("Path is empty"));
 217                         if (path.IndexOfAny (Path.InvalidPathChars) >= 0)
 218                                 throw new ArgumentException (Locale.GetText ("Path contains invalid chars"));
 219
 220                         MonoIOError error;
 221                         FileAttributes attrs;
 222
 223                         attrs = MonoIO.GetFileAttributes (path, out error);
 224                         if (error != MonoIOError.ERROR_SUCCESS)
 225                                 throw MonoIO.GetException (path, error);
 226                         return attrs;
 227                 }
 228
 229                 public static DateTime GetCreationTime (string path)
 230                 {
 231                         MonoIOStat stat;
 232                         MonoIOError error;
 233                         CheckPathExceptions (path);
 234
 235                         if (!MonoIO.GetFileStat (path, out stat, out error)) {
 236 #if NET_2_0
 237                                 if (error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_FILE_NOT_FOUND)
 238                                         return DefaultLocalFileTime;
 239                                 else
 240                                         throw new IOException (path);
 241 #else
 242                                 throw CreatePartOfPathNotFoundException (path);
 243 #endif
 244                         }
 245                         return DateTime.FromFileTime (stat.CreationTime);
 246                 }
 247
 248                 public static DateTime GetCreationTimeUtc (string path)
 249                 {
 250                         return GetCreationTime (path).ToUniversalTime ();
 251                 }
 252
 253                 public static DateTime GetLastAccessTime (string path)
 254                 {
 255                         MonoIOStat stat;
 256                         MonoIOError error;
 257                         CheckPathExceptions (path);
 258
 259                         if (!MonoIO.GetFileStat (path, out stat, out error)) {
 260 #if NET_2_0
 261                                 if (error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_FILE_NOT_FOUND)
 262                                         return DefaultLocalFileTime;
 263                                 else
 264                                         throw new IOException (path);
 265 #else
 266                                 throw CreatePartOfPathNotFoundException (path);
 267 #endif
 268                         }
 269                         return DateTime.FromFileTime (stat.LastAccessTime);
 270                 }
 271
 272                 public static DateTime GetLastAccessTimeUtc (string path)
 273                 {
 274                         return GetLastAccessTime (path).ToUniversalTime ();
 275                 }
 276
 277                 public static DateTime GetLastWriteTime (string path)
 278                 {
 279                         MonoIOStat stat;
 280                         MonoIOError error;
 281                         CheckPathExceptions (path);
 282
 283                         if (!MonoIO.GetFileStat (path, out stat, out error)) {
 284 #if NET_2_0
 285                                 if (error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_FILE_NOT_FOUND)
 286                                         return DefaultLocalFileTime;
 287                                 else
 288                                         throw new IOException (path);
 289 #else
 290                                 throw CreatePartOfPathNotFoundException (path);
 291 #endif
 292                         }
 293                         return DateTime.FromFileTime (stat.LastWriteTime);
 294                 }
 295
 296                 public static DateTime GetLastWriteTimeUtc (string path)
 297                 {
 298                         return GetLastWriteTime (path).ToUniversalTime ();
 299                 }
 300
 301                 public static void Move (string sourceFileName, string destFileName)
 302                 {
 303                         MonoIOError error;
 304
 305                         if (sourceFileName == null)
 306                                 throw new ArgumentNullException ("sourceFileName");
 307                         if (destFileName == null)
 308                                 throw new ArgumentNullException ("destFileName");
 309                         if (sourceFileName.Length == 0)
 310                                 throw new ArgumentException ("An empty file name is not valid.", "sourceFileName");
 311                         if (sourceFileName.Trim ().Length == 0 || sourceFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 312                                 throw new ArgumentException ("The file name is not valid.");
 313                         if (destFileName.Length == 0)
 314                                 throw new ArgumentException ("An empty file name is not valid.", "destFileName");
 315                         if (destFileName.Trim ().Length == 0 || destFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 316                                 throw new ArgumentException ("The file name is not valid.");
 317                         if (!MonoIO.Exists (sourceFileName, out error))
 318                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", sourceFileName), sourceFileName);
 319
 320                         // Don't check for this error here to allow the runtime
 321                         // to check if sourceFileName and destFileName are equal.
 322                         // Comparing sourceFileName and destFileName is not enough.
 323                         //if (MonoIO.Exists (destFileName, out error))
 324                         //      throw new IOException (Locale.GetText ("{0} already exists", destFileName));
 325
 326                         string DirName;
 327                         DirName = Path.GetDirectoryName (destFileName);
 328                         if (DirName != String.Empty && !Directory.Exists (DirName))
 329 #if NET_2_0
 330                                 throw new DirectoryNotFoundException (Locale.GetText ("Could not find a part of the path."));
 331 #else
 332                                 throw new DirectoryNotFoundException (Locale.GetText ("Could not find a part of the path '{0}'.", destFileName));
 333 #endif
 334
 335                         if (!MonoIO.MoveFile (sourceFileName, destFileName, out error)) {
 336                                 if (error == MonoIOError.ERROR_ALREADY_EXISTS)
 337                                         throw MonoIO.GetException (error);
 338                                 else if (error == MonoIOError.ERROR_SHARING_VIOLATION)
 339                                         throw MonoIO.GetException (sourceFileName, error);
 340
 341                                 throw MonoIO.GetException (error);
 342                         }
 343                 }
 344
 345                 public static FileStream Open (string path, FileMode mode)
 346                 {
 347                         return new FileStream (path, mode, mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite, FileShare.None);
 348                 }
 349
 350                 public static FileStream Open (string path, FileMode mode, FileAccess access)
 351                 {
 352                         return new FileStream (path, mode, access, FileShare.None);
 353                 }
 354
 355                 public static FileStream Open (string path, FileMode mode, FileAccess access,
 356                                                FileShare share)
 357                 {
 358                         return new FileStream (path, mode, access, share);
 359                 }
 360
 361                 public static FileStream OpenRead (string path)
 362                 {
 363                         return new FileStream (path, FileMode.Open, FileAccess.Read, FileShare.Read);
 364                 }
 365
 366                 public static StreamReader OpenText (string path)
 367                 {
 368                         return new StreamReader (path);
 369                 }
 370
 371                 public static FileStream OpenWrite (string path)
 372                 {
 373                         return new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None);
 374                 }
 375
 376 #if NET_2_0
 377                 public static void Replace (string sourceFileName,
 378                                             string destinationFileName,
 379                                             string destinationBackupFileName)
 380                 {
 381                         Replace (sourceFileName, destinationFileName, destinationBackupFileName, false);
 382                 }
 383
 384                 public static void Replace (string sourceFileName,
 385                                             string destinationFileName,
 386                                             string destinationBackupFileName,
 387                                             bool ignoreMetadataErrors)
 388                 {
 389                         MonoIOError error;
 390
 391                         if (sourceFileName == null)
 392                                 throw new ArgumentNullException ("sourceFileName");
 393                         if (destinationFileName == null)
 394                                 throw new ArgumentNullException ("destinationFileName");
 395                         if (sourceFileName.Trim ().Length == 0 || sourceFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 396                                 throw new ArgumentException ("sourceFileName");
 397                         if (destinationFileName.Trim ().Length == 0 || destinationFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 398                                 throw new ArgumentException ("destinationFileName");
 399
 400                         string fullSource = Path.GetFullPath (sourceFileName);
 401                         string fullDest = Path.GetFullPath (destinationFileName);
 402                         if (MonoIO.ExistsDirectory (fullSource, out error))
 403                                 throw new IOException (Locale.GetText ("{0} is a directory", sourceFileName));
 404                         if (MonoIO.ExistsDirectory (fullDest, out error))
 405                                 throw new IOException (Locale.GetText ("{0} is a directory", destinationFileName));
 406
 407                         if (!Exists (fullSource))
 408                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", sourceFileName),
 409                                                                  sourceFileName);
 410                         if (!Exists (fullDest))
 411                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", destinationFileName),
 412                                                                  destinationFileName);
 413                         if (fullSource == fullDest)
 414                                 throw new IOException (Locale.GetText ("Source and destination arguments are the same file."));
 415
 416                         string fullBackup = null;
 417                         if (destinationBackupFileName != null) {
 418                                 if (destinationBackupFileName.Trim ().Length == 0 ||
 419                                     destinationBackupFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 420                                         throw new ArgumentException ("destinationBackupFileName");
 421
 422                                 fullBackup = Path.GetFullPath (destinationBackupFileName);
 423                                 if (MonoIO.ExistsDirectory (fullBackup, out error))
 424                                         throw new IOException (Locale.GetText ("{0} is a directory", destinationBackupFileName));
 425                                 if (fullSource == fullBackup)
 426                                         throw new IOException (Locale.GetText ("Source and backup arguments are the same file."));
 427                                 if (fullDest == fullBackup)
 428                                         throw new IOException (Locale.GetText (
 429                                                                "Destination and backup arguments are the same file."));
 430                         }
 431
 432                         if (!MonoIO.ReplaceFile (fullSource, fullDest, fullBackup,
 433                                                  ignoreMetadataErrors, out error)) {
 434                                 throw MonoIO.GetException (error);
 435                         }
 436                 }
 437 #endif
 438 #if NET_2_0 && !NET_2_1
 439                 public static void SetAccessControl (string path,
 440                                                      FileSecurity fileSecurity)
 441                 {
 442                         throw new NotImplementedException ();
 443                 }
 444 #endif
 445
 446                 public static void SetAttributes (string path,
 447                                                   FileAttributes fileAttributes)
 448                 {
 449                         MonoIOError error;
 450                         CheckPathExceptions (path);
 451
 452                         if (!MonoIO.SetFileAttributes (path, fileAttributes, out error))
 453                                 throw MonoIO.GetException (path, error);
 454                 }
 455
 456                 public static void SetCreationTime (string path, DateTime creationTime)
 457                 {
 458                         MonoIOError error;
 459                         CheckPathExceptions (path);
 460                         if (!MonoIO.Exists (path, out error))
 461                                 throw MonoIO.GetException (path, error);
 462                         if (!MonoIO.SetCreationTime (path, creationTime, out error))
 463                                 throw MonoIO.GetException (path, error);
 464                 }
 465
 466                 public static void SetCreationTimeUtc (string path, DateTime creationTimeUtc)
 467                 {
 468                         SetCreationTime (path, creationTimeUtc.ToLocalTime ());
 469                 }
 470
 471                 public static void SetLastAccessTime (string path, DateTime lastAccessTime)
 472                 {
 473                         MonoIOError error;
 474                         CheckPathExceptions (path);
 475                         if (!MonoIO.Exists (path, out error))
 476                                 throw MonoIO.GetException (path, error);
 477                         if (!MonoIO.SetLastAccessTime (path, lastAccessTime, out error))
 478                                 throw MonoIO.GetException (path, error);
 479                 }
 480
 481                 public static void SetLastAccessTimeUtc (string path, DateTime lastAccessTimeUtc)
 482                 {
 483                         SetLastAccessTime (path, lastAccessTimeUtc.ToLocalTime ());
 484                 }
 485
 486                 public static void SetLastWriteTime (string path,
 487                                                      DateTime lastWriteTime)
 488                 {
 489                         MonoIOError error;
 490                         CheckPathExceptions (path);
 491                         if (!MonoIO.Exists (path, out error))
 492                                 throw MonoIO.GetException (path, error);
 493                         if (!MonoIO.SetLastWriteTime (path, lastWriteTime, out error))
 494                                 throw MonoIO.GetException (path, error);
 495                 }
 496
 497                 public static void SetLastWriteTimeUtc (string path,
 498                                                      DateTime lastWriteTimeUtc)
 499                 {
 500                         SetLastWriteTime (path, lastWriteTimeUtc.ToLocalTime ());
 501                 }
 502
 503                 #region Private
 504
 505                 private static void CheckPathExceptions (string path)
 506                 {
 507                         if (path == null)
 508                                 throw new System.ArgumentNullException("path");
 509                         if (path.Length == 0)
 510                                 throw new System.ArgumentException(Locale.GetText ("Path is empty"));
 511                         if (path.Trim().Length == 0)
 512                                 throw new ArgumentException (Locale.GetText ("Path is empty"));
 513                         if (path.IndexOfAny (Path.InvalidPathChars) != -1)
 514                                 throw new ArgumentException (Locale.GetText ("Path contains invalid chars"));
 515                 }
 516
 517 #if !NET_2_0
 518                 private static IOException CreatePartOfPathNotFoundException (string path)
 519                 {
 520                         string msg = Locale.GetText ("Part of the path \"{0}\" could not be found.", path);
 521                         return new IOException (msg);
 522                 }
 523 #endif
 524
 525                 #endregion
 526
 527 #if NET_2_0
 528                 //
 529                 // The documentation for this method is most likely wrong, it
 530                 // talks about doing a "binary read", but the remarks say
 531                 // that this "detects the encoding".
 532                 //
 533                 // This can not detect and do anything useful with the encoding
 534                 // since the result is a byte [] not a char [].
 535                 //
 536                 public static byte [] ReadAllBytes (string path)
 537                 {
 538                         using (FileStream s = Open (path, FileMode.Open, FileAccess.Read, FileShare.Read)){
 539                                 long size = s.Length;
 540
 541                                 //
 542                                 // Is this worth supporting?
 543                                 //
 544                                 if (size > Int32.MaxValue)
 545                                         throw new ArgumentException ("Reading more than 4gigs with this call is not supported");
 546
 547                                 byte [] result = new byte [s.Length];
 548
 549                                 s.Read (result, 0, (int) size);
 550
 551                                 return result;
 552                         }
 553                 }
 554
 555                 public static string [] ReadAllLines (string path)
 556                 {
 557                         using (StreamReader reader = File.OpenText (path)) {
 558                                 return ReadAllLines (reader);
 559                         }
 560                 }
 561
 562                 public static string [] ReadAllLines (string path, Encoding encoding)
 563                 {
 564                         using (StreamReader reader = new StreamReader (path, encoding)) {
 565                                 return ReadAllLines (reader);
 566                         }
 567                 }
 568
 569                 static string [] ReadAllLines (StreamReader reader)
 570                 {
 571                         List<string> list = new List<string> ();
 572                         while (!reader.EndOfStream)
 573                                 list.Add (reader.ReadLine ());
 574                         return list.ToArray ();
 575                 }
 576
 577                 public static string ReadAllText (string path)
 578                 {
 579                         return ReadAllText (path, Encoding.UTF8Unmarked);
 580                 }
 581
 582                 public static string ReadAllText (string path, Encoding encoding)
 583                 {
 584                         using (StreamReader sr = new StreamReader (path, encoding)) {
 585                                 return sr.ReadToEnd ();
 586                         }
 587                 }
 588
 589                 public static void WriteAllBytes (string path, byte [] bytes)
 590                 {
 591                         using (Stream stream = File.Create (path)) {
 592                                 stream.Write (bytes, 0, bytes.Length);
 593                         }
 594                 }
 595
 596                 public static void WriteAllLines (string path, string [] contents)
 597                 {
 598                         using (StreamWriter writer = new StreamWriter (path)) {
 599                                 WriteAllLines (writer, contents);
 600                         }
 601                 }
 602
 603                 public static void WriteAllLines (string path, string [] contents, Encoding encoding)
 604                 {
 605                         using (StreamWriter writer = new StreamWriter (path, false, encoding)) {
 606                                 WriteAllLines (writer, contents);
 607                         }
 608                 }
 609
 610                 static void WriteAllLines (StreamWriter writer, string [] contents)
 611                 {
 612                         foreach (string line in contents)
 613                                 writer.WriteLine (line);
 614                 }
 615
 616                 public static void WriteAllText (string path, string contents)
 617                 {
 618                         WriteAllText (path, contents, Encoding.UTF8Unmarked);
 619                 }
 620
 621                 public static void WriteAllText (string path, string contents, Encoding encoding)
 622                 {
 623                         using (StreamWriter sw = new StreamWriter (path, false, encoding)) {
 624                                 sw.Write (contents);
 625                         }
 626                 }
 627
 628                 static DateTime? defaultLocalFileTime;
 629                 static DateTime DefaultLocalFileTime {
 630                         get {
 631                                 if (defaultLocalFileTime == null)
 632                                         defaultLocalFileTime = new DateTime (1601, 1, 1).ToLocalTime ();
 633
 634                                 return defaultLocalFileTime.Value;
 635                         }
 636                 }
 637
 638
 639                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 640                 public static void Encrypt (string path)
 641                 {
 642                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 643                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 644                         // we throw the same (instead of a NotImplementedException) because most code should already be
 645                         // handling this exception to work properly.
 646                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 647                 }
 648
 649                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 650                 public static void Decrypt (string path)
 651                 {
 652                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 653                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 654                         // we throw the same (instead of a NotImplementedException) because most code should already be
 655                         // handling this exception to work properly.
 656                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 657                 }
 658 #endif
 659         }
 660 }