在使用ZipArchive的Windows Store應用程序中獲取InvalidDataException提取.zip文件

Question

我正在開發一個Windows應用商店應用程序驗證概念，它將打開一個.zip文件並將內容解壓縮到特定於應用程序的漫遊文件夾。我研究了幾種流行的庫來提取內容，發現這些庫不支持Windows Store應用（至少現在還沒有）。所以，我決定和ZipArchive一起去。我有下面的代碼在按鈕單擊處理程序：

private async void Button_Click_1(object sender, RoutedEventArgs e) 
{ 
    var fileOpenPicker = new FileOpenPicker(); 
    fileOpenPicker.FileTypeFilter.Add(".zip"); 
    var openedFile = await fileOpenPicker.PickSingleFileAsync(); 

    var booksFolder = await Windows.Storage.ApplicationData.Current.RoamingFolder.CreateFolderAsync("Stuff", CreationCollisionOption.OpenIfExists); 
    var folder = await booksFolder.CreateFolderAsync(openedFile.Name.Replace(".zip", string.Empty), CreationCollisionOption.ReplaceExisting); 

    using (var stream = await openedFile.OpenStreamForReadAsync()) 
    { 
     using (var zip = new ZipArchive(stream, ZipArchiveMode.Read)) 
     { 
      foreach (var entry in zip.Entries) 
      { 
       using (var entryStream = entry.Open()) 
       { 
        var file = await folder.CreateFileAsync(entry.Name); 
        using (var decompressedStream = await file.OpenStreamForWriteAsync()) 
        { 
         using (var deflateStream = new DeflateStream(entryStream, CompressionMode.Decompress)) 
         { 
          await deflateStream.CopyToAsync(decompressedStream, (int)entry.Length); 
         } 
        } 
       } 
      } 
     } 
    } 
} 

但是，我上線

await deflateStream.CopyToAsync(decompressedStream, (int)entry.Length); 

得到InvalidDataException以下是異常的詳細信息：

System.IO.InvalidDataException was unhandled by user code 
    HResult=-2146233087 
    Message=Unknown block type. Stream might be corrupted. 
    Source=System 
    StackTrace: 
     at System.IO.Compression.DeflateStream.EndRead(IAsyncResult asyncResult) 
     at System.IO.Stream.<BeginEndReadAsync>b__e(Stream stream, IAsyncResult asyncResult) 
     at System.Threading.Tasks.TaskFactory`1.FromAsyncTrimPromise`1.Complete(TInstance thisRef, Func`3 endMethod, IAsyncResult asyncResult, Boolean requiresSynchronization) 
    --- End of stack trace from previous location where exception was thrown --- 
     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
     at System.IO.Stream.<CopyToAsyncInternal>d__2.MoveNext() 
    --- End of stack trace from previous location where exception was thrown --- 
     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
     at System.Runtime.CompilerServices.TaskAwaiter.GetResult() 
     at POC.MoviePlayer.GroupedItemsPage.<Button_Click_1>d__4.MoveNext() in c:\Users\Brent\Documents\Visual Studio 2012\Projects\POC.MoviePlayer\POC.MoviePlayer\GroupedItemsPage.xaml.cs:line 108 
    InnerException: 

的。我嘗試導入的壓縮文件是使用Windows資源管理器的「發送到壓縮（壓縮）文件夾」選項創建的。我也嘗試使用ZipArchive在代碼中創建一個.zip文件，但我也得到了更多的例外代碼。既然這不是我理想的用例，我不會將我的代碼添加到.zip中，除非它對某人有用。

我希望有人能夠在上面的代碼中看到我的方式的錯誤，或提供一個鏈接到一個固定的庫來處理最好是開源的zip文件。這個沮喪的開發者會非常感謝任何幫助。

Answer 1

您不必解壓縮結果entry.Open()。它已經解壓。

您也可以使用ZipFileExtensions.ExtractToDirectory（http://msdn.microsoft.com/en-us/library/system.io.compression.zipfileextensions.extracttodirectory.aspx）來簡化您的代碼。