Hi, I can not make busy indicators work.
I call the radVirtualGrid1.MasterViewInfo.IsWaiting = true before (and false after) i load a huge amount of data and write on the virtual grid with the CellValueNeeded event but i can't see the busy indicator bar.
Same thing when I call radVirtualGrid1.MasterViewInfo.StartRowWaiting(indexRow) inside the RowExpanding event and radVirtualGrid1.MasterViewInfo.StopRowWaiting(indexRow) inside the RowExpanded event.
The indicator doesn't work..
I partially resolved with the call to Application.DoEvents() immediately after the above methods. I can see the bar but they aren't animated!
Thanks in advance
3 Answers, 1 is accepted
According to the provided information, it seems that the UI thread is busy. Are you performing a long-lasting operation which may be blocking the busy indicators? Consider executing the heavy operations in a BackgroundWorker. Thus, the UI thread won't be blocked. The following article is quite useful on this topic: https://docs.telerik.com/devtools/winforms/controls/track-and-status-controls/waitingbar/using-waitingbar-with-a-background-worker
The Demo application >> Virtual Grid >> Web service example demonstrates how to use the busy indicators properly. It
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Happy holidays
Dess | Tech Support Engineer, Sr.
Progress Telerik
Rank 1
Hi Dess, ok i have used a BackgroundWorker and the main busy indicator now works! Thanks.
But I have some problems with the StartRowWaiting() method. I use a timer like the telerik example but i would like to load my data inside the RowExpanding method.. In this case the animation stop to work. You can simulate the loading with a Thread.Sleep
01.private void radVirtualGrid1_RowExpanding(object sender, Telerik.WinControls.UI.VirtualGridRowExpandingEventArgs e)02. {03. if (viewInfoToExpand == null)04. {05. e.Cancel = true;06. e.ViewInfo.StartRowWaiting(e.RowIndex);07. viewInfoToExpand = e.ViewInfo;08. rowToExpand = e.RowIndex;09. expandTimer.Start();10. }11. else12. {13. if (rowToExpand != e.RowIndex)14. {15. e.Cancel = true;16. }17. else18. {19. 20. e.ChildViewInfo.ColumnCount = 4;21. e.ChildViewInfo.RowCount = 5;22. e.ChildViewInfo.EnablePaging = true;23. // In my software implementation, here invoke an event that load huge amount of data24. System.Threading.Thread.Sleep(10000);25. }26. }27. }Once a time-consuming operation is started, RadVirtualGrid does not move its indicators and literally freezes. Such cases occur when the long-running operation is executed on the same thread as the virtual grid: the primary UI Thread. The operation does not allow the form to update its UI and as a result the control does not perform any waiting animation. One obvious solution is to start the time-consuming operation in a new thread. You can refer to the following help article which demonstrates a sample approach: https://docs.telerik.com/devtools/winforms/controls/track-and-status-controls/waitingbar/using-waitingbar-with-a-background-worker
Should you have further questions please let me know.
Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik