Hi,

I have an ultragrid with a number of group by columns that are added at runtime programmatically. On occasion I get the below exception.

It is difficult to replicate and occurs arbitrarily. I am not doing a cast of this kind anywhere in my code.

As you can see the exception is being thrown in the OnPaint method. Any thoughts?

System.InvalidCastException: Unable to cast object of type 'Infragistics.Win.UltraWinGrid.UltraGridRow' to type 'Infragistics.Win.UltraWinGrid.UltraGridGroupByRow'.

at Infragistics.Win.UltraWinGrid.RowsCollection.SyncRows_Add(UltraGridRow row, Int32 desiredIndex)

at Infragistics.Win.UltraWinGrid.RowsCollection.SyncRowsHelper(IList boundList)

at Infragistics.Win.UltraWinGrid.RowsCollection.SyncRows()

at Infragistics.Win.UltraWinGrid.RowsCollection.VerifyGroupByVersionHelper()

at Infragistics.Win.UltraWinGrid.UltraGridRow.get_ParentRow()

at Infragistics.Win.UltraWinGrid.UltraGridRow.get_HiddenResolved()

at Infragistics.Win.UltraWinGrid.RowScrollRegion.get_FirstRow()

at Infragistics.Win.UltraWinGrid.RowScrollRegion.GetMaxScrollPosition(Boolean scrollToFill)

at Infragistics.Win.UltraWinGrid.RowScrollRegion.EnsureScrollRegionFilled(Boolean calledFromRegenerateVisibleRows)

at Infragistics.Win.UltraWinGrid.RowScrollRegion.RegenerateVisibleRows(Boolean resetScrollInfo)

at Infragistics.Win.UltraWinGrid.RowScrollRegion.WillScrollbarBeShown(ScrollbarVisibility assumeColScrollbarsVisible)

at Infragistics.Win.UltraWinGrid.RowScrollRegion.PositionScrollbar(Boolean resetScrollInfo)

at Infragistics.Win.UltraWinGrid.ScrollRegionBase.SetOriginAndExtent(Int32 origin, Int32 extent)

at Infragistics.Win.UltraWinGrid.RowScrollRegion.SetOriginAndExtent(Int32 origin, Int32 extent)

at Infragistics.Win.UltraWinGrid.DataAreaUIElement.ResizeRowScrollRegions()

at Infragistics.Win.UltraWinGrid.DataAreaUIElement.PositionChildElements()

at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)

at Infragistics.Win.UltraWinGrid.DataAreaUIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)

at Infragistics.Win.UltraWinGrid.DataAreaUIElement.set_Rect(Rectangle value)

at Infragistics.Win.UltraWinGrid.UltraGridUIElement.PositionChildElements()

at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)

at Infragistics.Win.UltraWinGrid.UltraGridUIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)

at Infragistics.Win.UIElement.DrawHelper(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Boolean clipText, Boolean forceDrawAsFocused, Boolean preventAlphaBlendGraphics)

at Infragistics.Win.UIElement.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Boolean forceDrawAsFocused, Boolean preventAlphaBlendGraphics)

at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Size elementSize, Boolean preventAlphaBlendGraphics)

at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Size elementSize)

at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode)

at Infragistics.Win.UltraWinGrid.UltraGridUIElement.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode)

at Infragistics.Win.UltraControlBase.OnPaint(PaintEventArgs pe)

at Infragistics.Win.UltraWinGrid.UltraGrid.OnPaint(PaintEventArgs pe)

at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)

at System.Windows.Forms.Control.WmPaint(Message& m)

at System.Windows.Forms.Control.WndProc(Message& m)

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)

thanks

Alan