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並前往https://stackoverflow.com/questions/8968641/how-do-i-check-a-webclient-request-for-a-404-error/20446481

How do I check a WebClient Request for a 404 error - Stack ...

If you specifically want to catch error 404: using (var client = new WebClient()) { try { client.DownloadFile(url, destination); } catch ...

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