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?
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2 Answers
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 } 
5 Comments
Bruce Adams
Thanks. I'm working with multithreading, the file upload is already running on a different thread. So should I just use the Uploadfile method or the UploadfileAsync method?
Matt Brindley
You'll still need to UploadFileAsync I'm afraid, the thread will block on a call to UploadFile so those events will never get called. You can recreate your own blocking by setting a bool flag when you start the upload, reset it in uploadcomplete, then thread.sleep until the flag is cleared.
Chauskin Rodion
note:
UploadProgressChanged event does not work well with UploadDataAsync method
Nirav Parsana
How to pass parameters like FileName in WebClient?
H_H
Did you use any cancelAsyc in your method. if yes how did you use it in a way the cancel upload stop on the spot and not wait to end the upload process to cancel?
Add your event handler to WebClient.UploadProgressChanged and call WebClient.UploadFileAsync.
See the WebClient.UploadProgressChanged documentation for an example.
