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

Question

我将通过 StorageFile.CopyAsync() 将一些文件从视频库复制到我的应用程序存储中方法，但如果文件大小超过 1GB，则会抛出如下异常:

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？

Answer 1

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;
}