Based on this MSDN article, you could do something along the following lines:
try
{
// try to download file here
}
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError)
{
if (((HttpWebResponse)ex.Response).StatusCode == HttpStatusCode.NotFound)
{
// handle the 404 here
}
}
else if (ex.Status == WebExceptionStatus.NameResolutionFailure)
{
// handle name resolution failure
}
}
I'm not certain that WebExceptionStatus.NameResolutionFailure is the error you are seeing, but you can examine the exception that is thrown and determine what the WebExceptionStatus for that error is.
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根据这篇 MSDN 文章，您可以这样做大致如下：
我不确定
WebExceptionStatus.NameResolutionFailure是您看到的错误，但您可以检查引发的异常并确定WebExceptionStatus因为这个错误是。Based on this MSDN article, you could do something along the following lines:
I'm not certain that
WebExceptionStatus.NameResolutionFailureis the error you are seeing, but you can examine the exception that is thrown and determine what theWebExceptionStatusfor that error is.