Update progress bar from Task.Run async

Question

I have a method to generate software activation key from User Information:

private async void GenerateAsync()
        {
            await Task.Run(() =>
            {
                var secretstring = "CustomerName >> " + txtFullname.Text + " >> " + txtproducid.Text;
                keymng = new KeyManager(secretstring);
                var dateexp = numExpdate.Value;
                if (dateexp == 0)
                {
                    dateexp = 730000;
                }

                if (cbLicenseType.SelectedIndex == 0)
                {
                    kvc = new KeyValueClass()
                    {
                        LicenseType = LicenseType.FULL,
                        Header = Convert.ToByte(9),
                        Footer = Convert.ToByte(6),
                        ProductCode = PRODUCTCODE,
                        Edition = (Edition)Enum.Parse(typeof(Edition), cbEdition.SelectedText),
                        Version = 1,
                        Expiration = DateTime.Now.AddDays(Convert.ToInt32(dateexp))
                    };

                    if (!keymng.GenerateKey(kvc, ref productkey))
                    {
                        //Handling Error
                    }
                }
                else
                {
                    kvc = new KeyValueClass()
                    {
                        LicenseType = LicenseType.TRIAL,
                        Header = Convert.ToByte(9),
                        Footer = Convert.ToByte(6),
                        ProductCode = PRODUCTCODE,
                        Edition = (Edition)Enum.Parse(typeof(Edition), cbEdition.SelectedText),
                        Version = 1,
                        Expiration = DateTime.Now.AddDays(Convert.ToInt32(dateexp))
                    };
                    if (!keymng.GenerateKey(kvc, ref productkey))
                    {
                        //Handling Error
                    }
                }
            });

        }

and I have progressbar. I want to run this method async and update progress to progressbar. How to update UI with async-await method. BackgroundWorker is alternative???

score 23 · Accepted Answer · answered Mar 30 '17 at 12:46

You should use the more modern IProgress<T>/Progress<T> types:

var progress = new Progress<int>(value => { progressBar.Value = value; });
await Task.Run(() => GenerateAsync(progress));

void GenerateAsync(IProgress<int> progress)
{
  ...
  progress?.Report(13);
  ...
}

This is better than Invoke because it doesn't tie your business logic (GenerateAsync) to a particular UI, or to any UI at all.

score 6 · Answer 2 · answered Mar 29 '17 at 13:43

6

I use this method in Winforms:

progressBar1.Invoke((Action)(() => progressBar1.Value=50))

answered Mar 29 '17 at 13:43

Bali C

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Good answer while I am not sure if you need to cast it to an action. Should be possible like this `progressBar1.Invoke(() => { progressBar1.Value = 50 });` – Nico Mar 29 '17 at 13:49
@Nico Cool, I'll try without the cast – Bali C Mar 29 '17 at 13:54
Nice answer! I'll try it. – alextran Mar 29 '17 at 13:57
Let me know if it is not possible @BaliC :) Didn't work with c# for quite a while by now. – Nico Mar 29 '17 at 13:59

Update progress bar from Task.Run async

2 Answers2

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