System.InvalidCast異常Windows運行時

Question

我正在爲Windows存儲構建電子書管理器，並在其中一個類上實現了IUriToStreamResolver接口。我正在使用它來打開epub。代碼如下：

public IAsyncOperation<IInputStream> UriToStreamAsync(Uri uri) 
{ 
    if(uri == null) 
    { 
     throw new Exception(); 
    } 

    string path = uri.AbsolutePath; 

    return GetContent(path).AsAsyncOperation(); 
} 


private async Task<IInputStream> GetContent(string path) 
{ 
    path = path.TrimStart('/'); 
    var file = await StorageApplicationPermissions.FutureAccessList.GetFileAsync(App.token); 
    var stream = await file.OpenAsync(FileAccessMode.Read); 
    var archive = new ZipArchive(stream.AsStream()); 
    var entry = archive.Entries.Where(a => a.FullName == path); 
    var entryStream = entry.First().Open(); 
    return entryStream.AsInputStream(); 
} 

從GetContent()方法返回後，我得到一個神祕的System.InvalidCast例外。我啓用了混合調試思路，我可以獲得更多信息，但它不是非常有用。

這裏是堆棧：

combase.dll RoFailFastWithErrorContextInternal（長，無符號長，結構_STOWED_EXCEPTION_INFORMATION_V1 *常量）未知 combase.dll!_RoFailFastWithErrorContext@4（）未知 twinapi.appcore.dll ！Windows :: ApplicationModel :: Core :: CoreApplication :: ForwardLocalError（struct IRestrictedErrorInfo *）Unknown twinapi.appcore.dll！Windows :: ApplicationModel :: Core :: CoreApplicationFactory :: ForwardLocalError（struct IRestrictedErrorInfo *）Unknown combase.dll ！CallErrorForwarder（void *，int，struct IRestrictedErrorInfo *）未知 combase.dll!_RoReportUnhandledError@4（）未知 mscorlib.ni.dll！63eb2d62（）未知 [下面的框架可能不正確和/或丟失，沒有爲mscorlib.ni.dll加載的符號]
[Managed to Native過渡]
mscorlib.dll中！System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeMarshal.RoReportUnhandledError（System.Runtime.InteropServices.WindowsRuntime.IRestrictedErrorInfo錯誤）未知 mscorlib.dll中！System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeMarshal.ReportUnhandledError（系統.Exception e）未知 System.Runtime.WindowsRuntime.dll！System.Threading.WinRTSynchronizationContext.Invoker.InvokeCore（）未知 System.Runtime.WindowsRuntime.dll！System.Threading.WinRTSynchronizationContext.Invo ker.InvokeInContext（object thisObj）Unknown mscorlib.dll！System.Threading.ExecutionContext.RunInternal（System.Threading.ExecutionContext executionContext，System.Threading.ContextCallback callback，object state，bool preserveSyncCtx）Unknown mscorlib.dll！System.Threading .ExecutionContext.Run（System.Threading.ExecutionContext executionContext，System.Threading.ContextCallback callback，object state，bool preserveSyncCtx）Unknown System.Runtime.WindowsRuntime.dll！System.Threading.WinRTSynchronizationContext.Invoker.Invoke（）Unknown [Native to Managed Transition]
Windows :: UI.dll！Windows :: UI :: Core :: CDispatcher :: ProcessInvokeItem（）Line 794 C++ Windows.UI.dll！Windows :: UI :: Core :: CDispatcher :: WaitAndProcessMessages （void * hEventWait）C++ Windows :: UI.dll！Windows :: UI :: Core :: CDispatcher :: ProcessEvents（Windows :: UI :: Core :: CoreProcessEventsOption options = CoreProcessEventsOption_ProcessUntilQuit）Line 390 C++ Windows.UI.Xaml.dll！DirectUI :: FrameworkView :: Run（）未知 twinapi.appcore.dll！Windows :: ApplicationModel :: Core :: CoreApplicationView :: Run（void）未知 twinapi.appcore.dll！Windows :: Foundation :: Collections :: Internal :: HashMap ，struct Windows :: Foundation :: Collections :: Internal :: DefaultEqualityPredicate，struct Windows :: Foundation :: Collections :: Internal :: DefaultLifetimeTraits，struct Windows :: ApplicationModel :: Core :: Details :: SmugglableInterfaceLifetimeTraits，struct Windows :: Foundation :: Collections :: Internal :: HashMapOptions，0,1,0 >> ::刪除（unsigned int）未知 SHCore.dll！Microsoft :: WRL :: RuntimeClass，類CScalingInfoBase，結構ICalWindowChangeListener，類Microsoft :: WRL :: FtmBase，類Microsoft :: WRL :: Details :: Nil，類Microsoft :: WRL :: Details :: Nil，class Microsoft： ：WRL ::詳細信息::無，類Microsoft :: WRL ::詳細信息::無，類Microsoft :: WRL ::詳細信息::無，類Microsoft :: WRL ::詳細信息:: Nil> ::刪除向量析構函數「（無符號整數）未知 KERNEL32.DLL！@ BaseThreadInitThunk @ 12（）未知 ntdll.dll的！__ RtlUserThreadStart（）未知 ntdll.dll的！__ RtlUserThreadStart @ 8（）未知

這裏是唯一local： $ exceptionstack

[9 Frames, combase.dll!_RoOriginateLanguageException@12()] 
    [0] combase.dll!_RoOriginateLanguageException@12() void* 
    [1] mscorlib.ni.dll!63eb2c8a() void* 
    [2] mscorlib.ni.dll!63f4ffa2() void* 
    [3] mscorlib.ni.dll!63f4fd61() void* 
    [4] System.Runtime.WindowsRuntime.ni.dll!506ef9df() void* 
    [5] System.Runtime.WindowsRuntime.ni.dll!506ef965() void* 
    [6] mscorlib.ni.dll!63823156() void* 
    [7] System.Runtime.WindowsRuntime.ni.dll!506ef934() void* 
    [8] Windows.UI.ni.dll!50e1ff16() void* 

任何幫助或方向是非常感謝！

Answer 1

我修正了它，但我不確定它是否是最佳解決方案。如果有人想提出改進建議，我就是遊戲。

在我GetContent()方法我做了以下修改：

private async Task<IInputStream> GetContent(string path) 
    { 
     try 
     { 
      path = path.TrimStart('/'); 
      var file = await StorageApplicationPermissions.FutureAccessList.GetFileAsyn(App.token); 

      var archive = new ZipArchive(await file.OpenStreamForReadAsync(),ZipArchiveMode.Read); 
      var entry = archive.GetEntry(path); 
      var contents = new byte[entry.Length]; 
      var entryStream = entry.Open(); 
      var tempFile = await ApplicationData.Current.LocalFolder.CreateFileAsync("temp.xhtml",CreationCollisionOption.ReplaceExisting); 
      var decompressedStream = await tempFile.OpenStreamForWriteAsync(); 
      await entryStream.CopyToAsync(decompressedStream, (int)entry.Length); 
      await decompressedStream.FlushAsync(); 
      decompressedStream.Dispose(); 
      var returnFile = await ApplicationData.Current.LocalFolder.GetFileAsync("temp.xhtml"); 
      var returnStream = await returnFile.OpenSequentialReadAsync(); 
      return returnStream; 
     } 
     catch (Exception e) 
     { 

      throw; 
     } 
    }