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[Solved] ResumeNotifications() error

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GridView

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Rama asked on 13 Aug 2010, 04:50 PM

Hi,
   I am getting "NullReferenceException" error when it hits "ResumeNotifications()" line. This is how the error occurs:
I open the form that has the grid. I click on the scroll bar to scroll up or down. Then I close the form and open the same form again and it shows the error. If i do not use scroll bar then there is no error. Here is my code:

client.ListCompleted += (s, args) =>
            {
                client.CloseAsync();
               this.lst.SuspendNotifications();
                this.lst.Clear();
                this.lst.AddRange(args.Result.lst);
                this.lst.ResumeNotifications();
                this.lstView.SetIsLoading(false);
                this.lstView.Refresh();
                this.lstView.CollectionChanged += lstView_CollectionChanged;
            };

Thanks.

4 Answers, 1 is accepted

answered on 16 Aug 2010, 01:40 PM

Hi Vlad,
    Here is the stack trace:

System.NullReferenceException was unhandled by user code
Message=Object reference not set to an instance of an object.
StackTrace:
at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
   at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
   at System.Windows.UIElement.UpdateLayout()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.ItemsSourceChanged(Boolean sourceChanged)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnItemsChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Controls.GridView.BaseItemsControl.OnItemCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.DataItemCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.DataItemCollection.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(Object sender, NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.RefreshOverride()
   at Telerik.Windows.Data.QueryableCollectionView.RefreshInternal()
   at Telerik.Windows.Data.QueryableCollectionView.RefreshOrDefer()
   at Telerik.Windows.Data.QueryableCollectionView.ProcessSynchronousCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.OnSourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(Object sender, NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)
   at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.RadObservableCollection`1.ResumeNotifications()
   at myAPP.ViewModel.Financials.myData.MV.MVCViewModel.<>c__DisplayClass13.<ShowDetails>b__12(Object s, GetmyListCompletedEventArgs args)
   at myAPP.myDataService.myDataServiceClient.OnGetmyListCompleted(Object state)

Thanks.