Pass Progress Bar As Parameter?

Question

I have a method name DownloadProgressChanged. My program will be able to download multiple things, so therefore it will have different progressbars. The problem with DownloadProgressChanged is that I'm unsure how to get it to use a different progressbar depending on what is being downloaded. So essentially I'm wondering if I can pass the progressBar name through as a parameter when the method is called. (Like if downloading something else, progressBar2 will activate instead of progressBar1). My code is below.

WebClient wc = new WebClient();
        wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgressChanged);
        wc.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCompleted);


void DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        double bytesIn = double.Parse(e.BytesReceived.ToString());
        double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
        double percentage = bytesIn / totalBytes * 100;
        progressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
    }

LOL! Downvoted within 30 seconds of posting the question. Typical StackOverflow. — John Smith, Nov 19 '15 at 23:49
see http://stackoverflow.com/questions/2465040/using-lambda-expressions-for-event-handlers. You can capture progress bar UI element inside the lambda — pm100, Nov 19 '15 at 23:51
@pm100 May not be ideal if the OP doesn't want to use a lambda expression. — Luke Joshua Park, Nov 19 '15 at 23:56
The lambda expression seems a bit more efficient, I'm just unsure how to implement it even after reading that link. — John Smith, Nov 19 '15 at 23:59

score 0 · Answer 1 · answered Nov 19 '15 at 23:53

Why not use a Dictionary<WebClient, ProgressBar>?

When creating your WebClient, assign the WebClient field of your dictionary to be the relevant ProgressBar. You could then retrieve this ProgressBar in your DownloadProgressChanged method by casting sender to a WebClient and doing a lookup in your dictionary.

Pass Progress Bar As Parameter?

1 Answers1