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Error dragging column header

Thread ID:





96245 Aug 31,2010 02:15 PM UTC Feb 7,2011 10:28 AM UTC WinForms 3
Tags: Grouping
Asked On August 31, 2010 02:15 PM UTC


I am using a GridGroupingControl v6.302.0.6.

When dragging a column header to the right, I get the following error as soon as the mouse cursor crosses over to the next column.

System.NullReferenceException: Object reference not set to an instance of an object.
at Syncfusion.Windows.Forms.Grid.Grouping.GroupDragHeaderMouseControllerBase.UpdateRedArrowIndicator()
at Syncfusion.Windows.Forms.Grid.Grouping.GridTableControlDragHeaderMouseController.MouseMove(MouseEventArgs e)
at Syncfusion.Windows.Forms.MouseControllerDispatcher.ProcessMouseMove(MouseEventArgs e)
at Syncfusion.Windows.Forms.ScrollControllMouseControllerDispatcher.ScrollControlMouseMoveHandled(Object sender, MouseEventArgs e)
at Syncfusion.Windows.Forms.ScrollControl.OnScrollControlHandledMouseMove(MouseEventArgs e)
at Syncfusion.Windows.Forms.ScrollControl.OnMouseMove(MouseEventArgs e)
at Syncfusion.Windows.Forms.Grid.GridControlBase.OnMouseMove(MouseEventArgs e)
at Syncfusion.Windows.Forms.Grid.Grouping.GridTableControl.OnMouseMove(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseMove(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at Syncfusion.Windows.Forms.ScrollControl.WndProc(Message& msg)
at Syncfusion.Windows.Forms.Grid.GridControlBase.WndProc(Message& msg)
at Syncfusion.Windows.Forms.Grid.Grouping.GridTableControl.WndProc(Message& msg)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Both columns are un-bound, but I don't know if this is relevant.

Are there any suggetions on how I can handle/supress this error? I thought I could extend GridTableControlDragHeaderMouseController, and override MouseMove() to handle the NullReferenceException. But I couldn't find anywhere to plug-in my version of GridTableControlDragHeaderMouseController.



Jisha Joy [Syncfusion]
Replied On September 2, 2010 07:14 AM UTC

Hi Richard,

I have tested the issue in different browser sample in v6.3. There was no application crash occurred at this point. Are you using any other settings with the grid used in your application? Please provide more details on the complete settings like properties, events handled etc., if used in your application or a minimal sample reproducing the issue. It would be fine for us to locate the issue and work to provide a better solution.


Leoni, Stefan
Replied On February 2, 2011 12:26 PM UTC


I have the same problem in Version
Have you ever found a solution to this problem ?

regards Stefan

Jisha Joy [Syncfusion]
Replied On February 7, 2011 10:28 AM UTC

Hi Stefan,

Could you please provide us a minimal sample that shows the issue?. We are unable to see the issue.



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