视觉c带有进度条的尖锐进度栏

Question

i have the following code that updates my progress bar in visual c sharp. it works fine and the bar moves for each percentage. but i also have code that i got from a post on another site, that is suppose to put the progress bar value in the middle of the progress bar as % percentage. it displays the % of the progress bar value for a split second but then disappears. i am new to c sharp and have tried several things like pBar.update and pBar.refresh after the pBar value change. i have edited some of the code to make it easier to understand. see below, once i reportprogress the background worker progresschanged executes and again the pBar value changes i see it change, and also the textbox text gets updated, but for some reason the code further below that draws the % text within the progress bar gets overwritten somehow. again i see the % for a split second. you can see some of my comments where i was trying various things to see if it would redraw the %

         private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        backgroundWorker1.ReportProgress(10);
        collect_long_process();
        }

         private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        pBar.Value = e.ProgressPercentage;

        txtBox_pBar.Text = "Gathering info";

        int percent = 10;//(int)(((double)pBar.Value / (double)pBar.Maximum) * 100);
        pBar.CreateGraphics().DrawString(percent.ToString() + "%", new Font("Arial", (float)8.25, FontStyle.Regular),
        Brushes.Black, new PointF(pBar.Width / 2 - 10, pBar.Height / 2 - 7));
    //pBar.Update();
    //Application.DoEvents();
    }

Answer 1

That code is wrong.

You need to handle the progress bar's Paint event and draw on e.Graphics .
Otherwise, your drawing will be overwritten next time the control paints itself.

In general, you should never draw on CreateGraphics() .