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//壓縮與解壓縮

          DoCompressDecompress(null);

          DoCompressDecompress(CompressAlgorithm.Xpress);

          DoCompressDecompress(CompressAlgorithm.XpressHuff);

          DoCompressDecompress(CompressAlgorithm.Mszip);

          DoCompressDecompress(CompressAlgorithm.Lzms);

       private async voidDoCompressDecompress(CompressAlgorithm? Algorithm)

       {

           try

           {

              var picker = newFileOpenPicker();

             picker.FileTypeFilter.Add("*");

              var originalFile = awaitpicker.PickSingleFileAsync();

              if (originalFile ==null)

                 return;

              var compressedFilename =originalFile.Name + ".compressed";

              var compressedFile = awaitKnownFolders.DocumentsLibrary.CreateFileAsync(compressedFilename,CreationCollisionOption.GenerateUniqueName);

              // ** 壓縮 **

              // 1. Opens input for theoriginal file.

              // 2. Opens output stream onthe file to be compressed and wraps it into Compressorobject.

              // 3. Copies original streaminto Compressor wrapper.

              // 4. Finalizes compressor -it puts termination mark into stream and flushes all intermediatebuffers.

              using (var originalInput =await originalFile.OpenReadAsync())

              using (var compressedOutput =await compressedFile.OpenAsync(FileAccessMode.ReadWrite))

              using (var compressor =Algorithm.HasValue ? newCompressor(compressedOutput.GetOutputStreamAt(0), Algorithm.Value,0) : new Compressor(compressedOutput.GetOutputStreamAt(0)))

              {

                 var bytesCompressed = awaitRandomAccessStream.CopyAsync(originalInput, compressor);

                 bool finished = awaitcompressor.FinishAsync();

                 Debug.WriteLine("Compressed {0} bytes into{1}\n", bytesCompressed, compressedOutput.Size);

              }

              var decompressedFilename =originalFile.Name + ".decompressed";

              var decompressedFile = awaitKnownFolders.DocumentsLibrary.CreateFileAsync(decompressedFilename,CreationCollisionOption.GenerateUniqueName);

              // ** 解壓縮 **

              // 1. Opens input stream oncompressed file and wraps it into Decompressor object.

              // 2. Opens output streamfrom the file that will store decompressed data.

              // 3. Copies data fromDecompressor stream into decompressed file stream.

              using (var compressedInput =await compressedFile.OpenSequentialReadAsync())

              using (var decompressor = newDecompressor(compressedInput))

              using (var decompressedOutput= await decompressedFile.OpenAsync(FileAccessMode.ReadWrite))

              {

                 var bytesDecompressed = awaitRandomAccessStream.CopyAsync(decompressor,decompressedOutput);

                 Debug.WriteLine("Decompressed {0} bytes ofdata\n", bytesDecompressed);

              }

           }

           catch(Exception ex)

           {

             Debug.WriteLine(ex.Message);

           }

       }