Getting the upload progress during file upload usi

问题:

I have an app that uploads files to server using the webclient. I'd like to display a progressbar while the file upload is in progress. How would I go about achieving this?

回答1:

WebClient.UploadFileAsync will allow you to do this.

WebClient webClient = new WebClient();
webClient.UploadFileAsync(address, fileName);
webClient.UploadProgressChanged += WebClientUploadProgressChanged;

...

void WebClientUploadProgressChanged(object sender, UploadProgressChangedEventArgs e)
{
        Console.WriteLine("Upload {0}% complete. ", e.ProgressPercentage);
}

Note that the thread won't block on Upload anymore, so I'd recommend using:

 webClient.UploadFileCompleted += WebClientUploadCompleted;

...

 void WebClientUploadCompleted(object sender, UploadFileCompletedEventArgs e)
 {
     // The upload is finished, clean up
 }

回答2:

Add your event handler to WebClient.UploadProgressChanged and call WebClient.UploadFileAsync.

See the WebClient.UploadProgressChanged documentation for an example.