WPF : Dispatcher processing has been suspended, but messages are still being processed

问题:

I Have a WPF Project, When i try to Run This Code On RowLoad Event I got below Error :

private void ParentGridView_OnRowLoaded(object sender, EventArgs e) {     try     {         if(((RadGridView)sender).Columns != null)         {             MessageBox.Show(((RadGridView)sender).Columns.Count.ToString(CultureInfo.InvariantCulture));         }     }     catch (Exception ex)     {         MessageBox.Show(ex.Message);     } } 

Error : Dispatcher processing has been suspended, but messages are still being processed.

Note That the GridView Control is Telerik RadGridView

回答1:

This answer describes the same situation as yours. (It references this answer on a different website).

The dispatcher processing is suspended to avoid reentrancy problems when updating the visual tree.

If you really need to display a message box in response to your "Row Loaded" event, you need to defer the call using `Dispatcher.BeginInvoke().

So, replace:

MessageBox.Show(((RadGridView)sender).Columns.Count.ToString(CultureInfo.InvariantCulture)); 

with:

var msg = ((RadGridView)sender).Columns.Count.ToString(CultureInfo.InvariantCulture); Dispatcher.BeginInvoke(new Action(() => MessageBox.Show(msg))); 

If this code is in a WPF object, then the Dispatcher property is available. Otherwise, you need to get it from somewhere else.

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