windows-phone-8.1 – 如何避免StorageFile.CopyAsync()在复制大文件时抛出异常？

我将通过StorageFile.copyAsync()方法将一些文件从视频库复制到我的应用程序存储,但如果文件的大小超过1GB,则会抛出异常,如下所示：

Type: System.Runtime.InteropServices.COMException Message: Error
HRESULT E_FAIL has been returned from a call to a COM component.
Stacktrace: at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

如何导入大文件,是否有解决此问题的解决方案？

我会尝试通过缓冲区复制它 – 例如像这样：

private async Task copyBigFile(StorageFile fileSource,StorageFile fileDest,CancellationToken ct)
{
   using (Stream streamSource = await fileSource.OpenStreamForReadAsync())
   using (Stream streamDest = await fileDest.OpenStreamForWriteAsync())
       await streamSource.copyToAsync(streamDest,1024,ct);
   return;
}