An odd issue that I have been trying to address in a project - my calls to WebClient.DownloadFileAsync seem to be getting ignored and no exceptions are being raised. So far I have been able to determine this might be due to destination folder not existing, but from the looks of the MSDN documentation for An odd issue that I have been trying to address
阅读背景：
WebClient.DownloadFileAsync无法引发异常
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