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Brandon Coon
15
InvalidOperationException - While Holding Down Mouse Over the Scroll Bar
posted

Hello,

I'm getting the InvalidOperationException whenever I scroll in an UltraGrid.

It happens randomly when I'm scrolling, especially if I hold down the mouse button over the scroll bar background to get the scroll bar to move to that location.

Nothing is being called when I scroll, just a cross thread issue between winforms and the grid

Here is the exception:

System.InvalidOperationException
HResult=0x80131509
Message=Cross-thread operation not valid: Control 'ugData' accessed from a thread other than the thread it was created on.
Source=System.Windows.Forms
StackTrace:
at System.Windows.Forms.Control.get_Handle()
at System.Windows.Forms.Control.PointToClientInternal(Point p)
at System.Windows.Forms.Control.PointToClient(Point p)
at Infragistics.Win.ButtonUIElementBase.VerifyMouseOverButton()
at Infragistics.Win.ScrollButtonUIElement.n(Object
)
at System.Threading.TimerQueueTimer.CallCallbackInContext(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.TimerQueueTimer.CallCallback()
at System.Threading.TimerQueueTimer.Fire()
at System.Threading.TimerQueue.FireNextTimers()
at System.Threading.TimerQueue.AppDomainTimerCallback()

Any ideas? Thanks!

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    Offline posted

    This is for a future person who runs into this.  I found the same issue in upgrading an OLD .Net app from 2.0 to 4.7.  Fortunately we bought the source code license so I was able to debug and recompile the control assembly to fix this.  Here is my solution.

    The ScrollButtonUIElement class has a SystemTimerCallback function that has two calls to this.VerifyMouseOverButton.  These calls are made from the timer thread, not the UI thread.  To fix this I changed the code

    from:

    this.VerifyMouseOverButton();

    to

    				if (control.InvokeRequired)
					control.Invoke(new MethodInvoker(this.VerifyMouseOverButton));
				else
					this.VerifyMouseOverButton();

    This fixes the error (if you have the source code).

    Cheers!

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