Getting the upload progress during file upload using Webclient.Uploadfile

Question

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?

Solution 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
 }

Solution 2

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

See the WebClient.UploadProgressChanged documentation for an example.

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?