System.Net.WebClient.CancelAsync抛出的ObjectDisposedException - ＆QUOT;无法访问已关闭的文件＆QUOT; [英] System.Net.WebClient.CancelAsync throws ObjectDisposedException -- "Cannot access a closed file."

问题描述

我试图下载一个文件异步使用WebClient类。我加入的事件处理程序DownloadProgressChanged和DownloadFileCompleted。如果我叫client.CancelAsync在下载进度的事件​​处理程序，我得到一个的ObjectDisposedException，告诉我该文件被关闭。如何正确取消异步文件下载？

I am attempting to download a file asynchronously using the WebClient class. I have added event handlers for DownloadProgressChanged and DownloadFileCompleted. If I call client.CancelAsync in the download progress event handler, I get an ObjectDisposedException, telling me the file is closed. How do I properly cancel an asynchronous file download?

推荐答案

原来，则会引发ObjectDisposedException，捕获并WebClient的忽略，如果该文件的下载速度足够快，该文件已被之后的进步改变事件仍在处理中关闭。

It turns out that ObjectDisposedException is thrown, caught and ignored by the WebClient if the file downloads sufficiently fast that progress change events are still being processed after the file has been closed.

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