[Solved] Grouping problem

[Maxim]

Grouping on any field other then 1st field results in error on the client side.

• Detailed all of the fields contain text.

  using System;
  using System.Linq;
  using System.Windows.Controls;
  using System.Data.Services.Client;
  
  namespace SilverlightApplication1
  {
      public partial class MainPage : UserControl
      {
          public MainPage()
          {
              InitializeComponent();
              BeginATOMRequest();
          }
  
          private void BeginATOMRequest()
          {
              var context = new DataServiceContext(new Uri("Services/DALWebDataService.svc", UriKind.Relative));
              var query = context.CreateQuery<Services.FiscalStatementLayout>("FiscalStatementLayouts");
  
              query.BeginExecute(ATOMRequestCompleted, query);
          }
  
          private void ATOMRequestCompleted(IAsyncResult asyncResult)
          {
              var query = asyncResult.AsyncState as DataServiceQuery<Services.FiscalStatementLayout>;
              var list = query.EndExecute(asyncResult).ToList();
  
              grid.ItemsSource = list;
          }
      }
  }

  <UserControl
      xmlns:telerikGridView="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"  xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
      x:Class="SilverlightApplication1.MainPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
    <Grid x:Name="LayoutRoot">
          <telerikGridView:RadGridView x:Name="grid" IsReadOnly="True"
                                     Grid.Row="1" DataLoadMode="Asynchronous"
                                     AutoGenerateColumns="False">
              <telerikGridView:RadGridView.Columns>
                  <telerikGridView:GridViewDataColumn Header="Statement" DataMemberBinding="{Binding StatementName}"/>
                  <telerikGridView:GridViewDataColumn Header="Code" DataMemberBinding="{Binding LineItemCode}"/>
                  <telerikGridView:GridViewDataColumn Header="Description" DataMemberBinding="{Binding LineItemDescription}"/>
                  <telerikGridView:GridViewDataColumn Header="Extra" DataMemberBinding="{Binding Definition}"/>
              </telerikGridView:RadGridView.Columns>
          </telerikGridView:RadGridView>
    </Grid>
  </UserControl>
  

Error: Unhandled Error in Silverlight Application Object reference not set to an instance of an object.   at Telerik.Windows.Data.GroupExtensions.<LeavesCount>b__a(IGroup g)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.Sum(IEnumerable`1 source)
   at System.Linq.Enumerable.Sum[TSource](IEnumerable`1 source, Func`2 selector)
   at Telerik.Windows.Data.GroupExtensions.LeavesCount(IEnumerable`1 groups)
   at Telerik.Windows.Data.QueryableCollectionView.get_ItemCount()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnCollectionViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.RefreshAndRaiseCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Telerik.Windows.Data.QueryableCollectionView.Refresh()
   at Telerik.Windows.Data.QueryableCollectionView.EndDefer()
   at Telerik.Windows.Data.QueryableCollectionView.DeferHelper.Dispose()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PerformGrouping(String member, Object displayContent, Nullable`1 insertionIndex)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.<>c__DisplayClass2a.<GroupingRequested>b__29()
   at Telerik.Windows.Controls.CursorManager.PerformTimeConsumingOperation(FrameworkElement frameworkElement, Action action)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.GroupingRequested(Object origin, GroupingRequestedEventArgs e)
Source File: http://localhost:3951/SilverlightApplication1TestPage.aspx
Line: 0

Error: Unhandled Error in Silverlight Application Object reference not set to an instance of an object.   at Telerik.Windows.Data.GroupExtensions.<LeavesCount>b__a(IGroup g)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.Sum(IEnumerable`1 source)
   at System.Linq.Enumerable.Sum[TSource](IEnumerable`1 source, Func`2 selector)
   at Telerik.Windows.Data.GroupExtensions.LeavesCount(IEnumerable`1 groups)
   at Telerik.Windows.Data.QueryableCollectionView.get_ItemCount()
   at Telerik.Windows.Data.QueryableCollectionView.get_CurrentItem()
   at Telerik.Windows.Data.Selection.SelectionHandler.InitializeCurrentItem()
   at Telerik.Windows.Controls.DataControl.InitializeSelection()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.InitializeSelection()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnAsyncDataLoadWorkerWorkCompleted(Object sender, RunWorkerCompletedEventArgs e)
   at System.ComponentModel.BackgroundWorker.OnRunWorkerCompleted(RunWorkerCompletedEventArgs e)
   at System.ComponentModel.BackgroundWorker.<OnRun>b__1(Object state)
Source File: http://localhost:3951/SilverlightApplication1TestPage.aspx
Line: 0

Error: Unhandled Error in Silverlight Application
Code: 4004    
Category: ManagedRuntimeError       
Message: System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Windows.Data.GroupExtensions.GetParentsAndSelfRecursive(IList`1 parents, IGroup targetGroup)
   at Telerik.Windows.Data.GroupExtensions.GetParentsAndSelf(IEnumerable`1 groups, IGroup targetGroup)
   at Telerik.Windows.Data.GroupExtensions.GroupUniqueKey(IEnumerable`1 groups, IGroup group)
   at Telerik.Windows.Controls.GridView.Rows.GroupRowExpandState.GetKey(Object target)
   at Telerik.Windows.Controls.GridView.RowExpandState.IsExpanded(Object target)
   at Telerik.Windows.Controls.GridView.GridViewGroupRow.UpdateIsExpandedFromOwnerDataControl()
   at Telerik.Windows.Controls.GridView.GridViewGroupRow.OnApplyTemplate()
   at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)     

Source File: http://localhost:3951/SilverlightApplication1TestPage.aspx
Line: 56

[Vlad]

Hi Maxim,

Can you reproduce this on some our online examples?

Greetings,
Vlad
the Telerik team

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[Maxim]

I will try.