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Narinder
217
Exception in IValueListOwner(Version 8.1.20081.2013)
posted

Hi ,

            We are running into an exception when using UltraGrid. Basically we have placed an drop drown in one of columns by changing its style to combo box. Once the selection of the combo box happens (trapped via cellchange event), we take the user to another screen in our UI. that the high level picture of what we are doing. we are seeing following exception coming from infragistics code.

 

If (e.Cell.Column.Index = 1) Then

If (e.Cell.Text.Equals("Create New Template")) Then

Dim mailMergeTemplate As New MailMergeTemplate()

Dim apppath As String = System.AppDomain.CurrentDomain.BaseDirectory.ToString

apppath = apppath + "NewDocument.doc"

mailMergeTemplate.MMTPath = apppath

RaiseEvent EditMailMergeTemplate(Me, New EditTemplateEventArgs(mailMergeTemplate))

End IfEnd If

 Exception Is:-

Object reference not set to an instance of an object. (Infragistics2.Win.v8.1)

------------------------------
Program Location:

   at Infragistics.Win.EditorWithCombo.Infragistics.Win.IValueListOwner.OnSelectionChangeCommitted()
   at Infragistics.Win.ValueList.ProcessSelectionChangeCommitted()
   at Infragistics.Win.ValueListDropDown.OnSelectionChangeCommitted()
   at Infragistics.Win.ValueListDropDown.SelectItemByMouse(ValueListItem valueListItem)
   at Infragistics.Win.ValueListDropDown.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at Infragistics.Win.ValueListDropDownUnsafe.WndProc(Message& message)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(ApplicationContext context)
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[ commandLine)
   at SDP.Win.Application.My.MyApplication.Main(String[ Args)

 Waiting your response,

 Ngaheer

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  • 217
    posted
    Hi Mike,
     
                          You are right. What we are doing is that when the selection in the drop down happens and cell change event happens, we are bringing a new control in the focus, which may be causing the drop down to get disposed. My question here is, is it possible for me to cancel the Cell Change event so that it doesn't get processed any further? Or is there a different solution you can suggest here?
     
    Thanks.
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