保存到Downloads文件夾，DataWriter.FlushAsync掛起90秒

Question

代碼：

private async Task<int> Save() 
{ 
    StorageFile file = await DownloadsFolder.CreateFileAsync("a.exe"); 
    IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.ReadWrite); 
    DataWriter writer = new DataWriter(stream); 
    byte[] buffer = new byte[4096]; 
    writer.WriteBytes(buffer); 
    await writer.StoreAsync(); 
    await writer.FlushAsync(); //Hang for a long time 
    writer.Dispose(); 
    return 1001; //eventually it can get to this line, no exception is thrown 
} 

編輯：

它是在Win8 CP發現建8250，升級後建8375，問題消失了。所以我想這是一個在winrt或win8中修復的bug。

Answer 1

你可以嘗試更多的東西是這樣的：

using (var fs = await file.OpenAsync(FileAccessMode.ReadWrite)) 
{ 
    using (var outStream = fs.GetOutputStreamAt(0)) 
    { 
     using (var dataWriter = new DataWriter(outStream)) 
     { 
      byte[] buffer = new byte[4096]; 
      dataWriter.WriteBytes(buffer) 
      await dataWriter.StoreAsync(); 
      dataWriter.DetachStream(); 
     } 

     await outStream.FlushAsync(); 
    } 
}