如何在Windows Phone 8中解压缩文件

是否可以在Windows Phone 8上的应用程序中解压缩文件？ 大多数lib使用Windows Phone 7但不使用Windows Phone 8。

甚至System.IO.Compression.ZipFile也不存在……

Answer 1

将此代码放在Unzipper类中，就像这样

  public sealed class UnZipper : IDisposable { private Stream stream; private List fileEntries; /// 
 /// Class used for storing file entry information when /// parsing the central file directory. /// 
 private class FileEntry { public string Filename; public int FileStart; public int CompressedSize; public int UncompressedSize; public int CRC32; } /// 
 /// Initializes a new instance of the  class. /// 
 /// The zip file stream. public UnZipper(Stream zipFileStream) { if (!zipFileStream.CanSeek) throw new NotSupportedException("zip stream must be seekable"); this.stream = zipFileStream; } /// 
 /// Gets the file stream for the specified file. Returns null if the file could not be found. /// 
 /// The filename. /// Stream to file inside zip stream public Stream GetFileStream(string filename) { if (fileEntries == null) fileEntries = ParseCentralDirectory(); //We need to do this in case the zip is in a format Silverligth doesn't like long position = this.stream.Position; this.stream.Seek(0, SeekOrigin.Begin); Uri fileUri = new Uri(filename, UriKind.Relative); StreamResourceInfo info = new StreamResourceInfo(this.stream, null); StreamResourceInfo stream = System.Windows.Application.GetResourceStream(info, fileUri); this.stream.Position = position; if (stream != null) return stream.Stream; return null; } /// 
 /// Gets a list of file names embedded in the zip file. /// 
 /// The stream for a zip file. /// List of file names public IEnumerable FileNamesInZip() { //get //{ if (fileEntries == null) fileEntries = ParseCentralDirectory(); foreach (FileEntry entry in fileEntries) //Ignore folders and "hidden" MacOS folders if (!entry.Filename.EndsWith("/") && !entry.Filename.StartsWith("__MACOSX/")) yield return entry.Filename; //} } /// 
 /// Gets a list of directories embedded in the zip file /// 
 public IEnumerable DirectoriesInZip { get { if (fileEntries == null) fileEntries = ParseCentralDirectory(); foreach (FileEntry entry in fileEntries) //Ignore files and special MacOS folders if (entry.Filename.EndsWith("/") && !entry.Filename.StartsWith("__MACOSX/")) yield return entry.Filename; } } private List ParseCentralDirectory() { BinaryReader reader = new BinaryReader(this.stream); List entries = new List(); reader.BaseStream.Seek(-4, SeekOrigin.End); while (reader.ReadInt32() != 101010256) { reader.BaseStream.Seek(-5, SeekOrigin.Current); } reader.BaseStream.Seek(6, SeekOrigin.Current); short entryCount = reader.ReadInt16(); int directorySize = reader.ReadInt32(); int directoryStart = reader.ReadInt32(); reader.BaseStream.Seek(directoryStart, SeekOrigin.Begin); bool needsFixing = false; for (int i = 0; i < entryCount; i++) { int headerSignature = reader.ReadInt32(); if (headerSignature == 33639248) //Central directory file header signature { reader.BaseStream.Seek(4, SeekOrigin.Current); byte flag = reader.ReadByte(); if ((flag & 8) > 0) //Silverlight doesn't like this format. We'll "fix it" further below { needsFixing = true; } reader.BaseStream.Seek(7, SeekOrigin.Current); int crc32 = reader.ReadInt32(); int compressedSize = reader.ReadInt32(); int unCompressedSize = reader.ReadInt32(); short fileNameLenght = reader.ReadInt16(); short extraFieldLength = reader.ReadInt16(); short fileCommentLength = reader.ReadInt16(); reader.BaseStream.Seek(8, SeekOrigin.Current); int fileStart = reader.ReadInt32(); string filename = new string(reader.ReadChars(fileNameLenght)); entries.Add(new FileEntry() { Filename = filename, FileStart = fileStart, CRC32 = crc32, CompressedSize = compressedSize, UncompressedSize = unCompressedSize }); reader.BaseStream.Seek(extraFieldLength + fileCommentLength, SeekOrigin.Current); } } if (needsFixing) { //We are using a zipformat that Silverlight doesn't like. //Zipfiles where the file size is reported after the compressed data //is a no-go, so we rebuild the header and report the information there. MemoryStream newZip = new MemoryStream(); BinaryWriter writer = new BinaryWriter(newZip); //Rebuild file entries foreach (FileEntry entry in entries) { FileEntry e = entry; reader.BaseStream.Seek(entry.FileStart, SeekOrigin.Begin); e.FileStart = (int)writer.BaseStream.Position; CopyBytes(reader, writer, 6); byte flag = reader.ReadByte(); writer.Write((byte)(247 & flag)); //set 3rd bit to 0 to indicate the new format CopyBytes(reader, writer, 7); writer.Write(entry.CRC32); //Update CRC writer.Write(entry.CompressedSize); //Update Compressed size writer.Write(entry.UncompressedSize); //Update Uncompressed size writer.Write((short)entry.Filename.Length); reader.BaseStream.Seek(14, SeekOrigin.Current); short fieldLength = reader.ReadInt16(); writer.Write(fieldLength); CopyBytes(reader, writer, entry.Filename.Length + fieldLength + entry.CompressedSize); } //Rebuild directory reader.BaseStream.Seek(directoryStart, SeekOrigin.Begin); for (int i = 0; i < entryCount; i++) { CopyBytes(reader, writer, 8); byte flag = reader.ReadByte(); writer.Write((byte)(247 & flag)); //set 3rd bit to 0 to indicate the new format CopyBytes(reader, writer, 19); short filenamelength = reader.ReadInt16(); writer.Write(filenamelength); short extrafieldlength = reader.ReadInt16(); writer.Write(extrafieldlength); short filecommentlength = reader.ReadInt16(); writer.Write(filecommentlength); CopyBytes(reader, writer, 8); writer.Write(entries[i].FileStart); reader.BaseStream.Seek(4, SeekOrigin.Current); CopyBytes(reader, writer, filenamelength + extrafieldlength + filecommentlength); } CopyBytes(reader, writer, (int)(reader.BaseStream.Length - reader.BaseStream.Position)); this.stream = newZip; //Replace stream with new stream } return entries; } private static void CopyBytes(BinaryReader input, BinaryWriter output, int count) { for (int i = 0; i < count; i++) { output.Write(input.ReadByte()); } } #region IDisposable Members /// 
 /// Performs application-defined tasks associated with freeing, releasing, /// or resetting unmanaged resources. /// 
 public void Dispose() { if (stream != null) stream.Dispose(); } #endregion } 

并在您要解压缩文件的地方使用此代码：

 IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication(); using (IsolatedStorageFileStream fileStream = myIsolatedStorage.OpenFile(yourFileName, FileMode.Open, FileAccess.ReadWrite)) { UnZipper unzip = new UnZipper(fileStream); foreach (string filename in unzip.FileNamesInZip()) { string FileName = filename; } }