C＃进度条未更新

Question

I have a progress bar on my form, I want it to update everytime at the end of a loop.

progressBar1.Value += (progressBar1.Maximum/4);
if (progressBar1.Value == progressBar1.Maximum)
{
  MessageBox.Show("Done!");
}

I have this at the end of my loop, but its not updating as the loop goes, just stays as a solid grey bar...Any tips? Thanks

Answer 1

This is not really an answer, and I'll delete it later, but here's an example of minimal, reproducible code

Drop a progress bar and a button on a form, and copy this into the button click event. When you click the button, the progress bar shows progress and then a message box is supposed to let you know when it's done, but instead I'm getting the following exception:

An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in System.Windows.Forms.dll

private void button1_Click(object sender, EventArgs e)
{
    progressBar1.Maximum = 999;

    while (progressBar1.Value < progressBar1.Maximum)
    {
        Thread.Sleep(500);
        progressBar1.Value += (progressBar1.Maximum / 4);
    }

    MessageBox.Show("Done!");
}