Unresponsiveness issue during Real-Time Updates in Winforms DataGridView

[DhivyaBharathi-SF3890]

.NET version

.Net 7.0

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No response

Issue description

In DataGridView, while updating the values like real-time updates, the demo becomes unresponsive. Without using the Refresh() method the values are not updated.

DataGrid_Refresh.zip

Steps to reproduce

1.Run the sample.
2.Click the Refresh button.

Observed Behavior:
The sample enters into the Not responding state

[lonitra]

@KlausLoeffelmann could you take an initial look at this?

[Zheng-Li01]

The issue can reproduce both .NET from 6.0 to 9.0 and .NET Framework 4.7.2 to 4.8.1 as below screenshot.

[LeafShi1]

This issue can be reproduced using the following simple code

 private void button1_Click(object sender, EventArgs e)
 {
     for (int i = 0; i < 100000; i++)
     {
         dataGridView1.Refresh();
     }
 }

WinFormsApp7.zip

[elachlan]

I don't think this is a bug. You are using thread.sleep in the UI thread. DataGridView.Refresh will trigger an invalidation of the whole gridview and repaint it. All of that will end up locking the UI thread.

It would be better to use a separate thread (via a background worker or similar) to report progress to the UI thread. BackgroundWorker.ReportProgress allows you to pass an object as well. Which can be your "progress" class.