[Solved] Application crashes when open form has grouped grid and DomainDataSource?

[hvduc]

Hi
I'm using RadGridView control in Rad Controls for telerik Q3 2011 1116 and DomainDataSource control for loading data.
After upgrading application's dll to version Q3 2011 1116, I get this error when open a form with a grid has a grouped column and a DomainDataSource control as form's datacontext.

Error: Unhandled Error in Silverlight Application
Code: 4004
Category: ManagedRuntimeError
Message: System.NullReferenceException: Object reference not set to an instance of an object.
   tại Telerik.Windows.Data.Expressions.ExpressionFactory.MakeMemberAccess(Expression instance, String memberName, Type memberType)
   tại Telerik.Windows.Data.Expressions.PropertyAccessExpressionBuilder.CreateMemberAccessExpressionOverride()
   tại Telerik.Windows.Data.Expressions.MemberAccessExpressionBuilderBase.CreateMemberAccessExpression()
   tại Telerik.Windows.Controls.GridViewColumn.CreateGroupKeyExpression(ParameterExpression parameterExpression, ExpressionBuilderOptions options)
   tại Telerik.Windows.Controls.GridView.ColumnGroupDescriptor.CreateMemberAccessExpression(ParameterExpression parameterExpression)
   tại Telerik.Windows.Controls.GridView.ColumnGroupDescriptor.CreateGroupKeyExpression(ParameterExpression parameterExpression)
   tại Telerik.Windows.Data.GroupDescriptorBase.CreateGroupKeyExpression(Expression itemExpression)
   tại Telerik.Windows.Data.IGroupDescriptorExtensions.GetGroupKeyType(IGroupDescriptor groupDescriptor, Type itemType)
   tại Telerik.Windows.Data.GroupInfo..ctor(IGroupDescriptor groupDescriptor, Type itemType)
   tại Telerik.Windows.Data.QueryableCollectionViewGroupRoot..ctor(IEnumerable`1 originalGroups, IEnumerable`1 groupDescriptors, IEnumerable`1 sortDescriptors, Type itemType)
   tại Telerik.Windows.Data.QueryableCollectionView.EnsureRootGroup()
   tại Telerik.Windows.Data.QueryableCollectionView.get_Groups()
   tại Telerik.Windows.Controls.GridView.BaseItemsControl.GetEffectiveItems(BaseItemsControl itemsControl)
   tại Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.EnsureIndexTree()
   tại Telerik.Windows.Controls.GridView.GridViewDataControl.InitializeShouldKeepScrollState()
   tại Telerik.Windows.Controls.GridView.GridViewDataControl.OnItemsChanged(NotifyCollectionChangedEventArgs e)
   tại Telerik.Windows.Controls.GridView.BaseItemsControl.OnItemCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   tại System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   tại Telerik.Windows.Data.DataItemCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   tại Telerik.Windows.Data.DataItemCollection.RaiseChangeEvents()
   tại Telerik.Windows.Data.DataItemCollection.SetItemsSource(IEnumerable source)
   tại Telerik.Windows.Controls.GridView.GridViewDataControl.<>c__DisplayClass19.<Bind>b__18()
   tại Telerik.Windows.Controls.CursorManager.PerformTimeConsumingOperation(FrameworkElement frameworkElement, Action action)
   tại Telerik.Windows.Controls.GridView.GridViewDataControl.Bind(Object newValue)
   tại Telerik.Windows.Controls.GridView.GridViewDataControl.OnApplyTemplate()
   tại System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)

I created a sample project for recreate this error.
In this sample, I add a RadGridView to form, Itemsource binding to DomainDataSource's Data property.

<telerikNavigation:RadWindow x:Class="BusinessApplication1.frmWindow"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
           xmlns:telerikGridView="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
           xmlns:telerikNavigation="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation"
           xmlns:telerikData="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data"
           xmlns:GridView="clr-namespace:Telerik.Windows.Controls.GridView;assembly=Telerik.Windows.Controls.GridView"
                             Width="800" Height="600" MinWidth="800" MinHeight="600"
           >
    <Grid x:Name="LayoutRoot" Margin="2">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <telerikGridView:RadGridView x:Name="grd"
                                         Grid.Row="0"
                                         ShowGroupPanel="False"
                                         SelectionMode="Single"
                                         RowIndicatorVisibility="Collapsed"
                                         CanUserFreezeColumns="False"
                                         ScrollMode="RealTime"
                                         AutoGenerateColumns="False"
                                         IsReadOnly="True"
                                         ShowColumnFooters="True"
                                         AutoExpandGroups="True"
                                         ItemsSource="{Binding Data}"
                                         IsBusy="{Binding IsLoadingData}"
                                         Margin="8,8,8,0">
            <telerikGridView:RadGridView.Columns>
                <telerikGridView:GridViewDataColumn DataMemberBinding="{Binding Column1}"
                                                            Width="0.6*"
                                                            HeaderTextAlignment="Center">
                    <telerikGridView:GridViewDataColumn.Header>
                        <TextBlock HorizontalAlignment="Center"
                                           Text="Column 1" />
                    </telerikGridView:GridViewDataColumn.Header>
                    <telerikGridView:GridViewDataColumn.AggregateFunctions>
                        <telerikData:CountFunction Caption="" />
                    </telerikGridView:GridViewDataColumn.AggregateFunctions>
                    <telerikGridView:GridViewDataColumn.Footer>
                        <GridView:AggregateResultsList ItemsSource="{Binding}"
                                                               VerticalAlignment="Center">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel HorizontalAlignment="Left"
                                                        Margin="4,0"
                                                        Orientation="Horizontal">
                                        <TextBlock VerticalAlignment="Center"
                                                           Text="Row" />
                                        <TextBlock VerticalAlignment="Center"
                                                           Text="{Binding FormattedValue}"
                                                           Margin="4,0,0,0" />
                                    </StackPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <StackPanel Orientation="Vertical" />
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                        </GridView:AggregateResultsList>
                    </telerikGridView:GridViewDataColumn.Footer>
                </telerikGridView:GridViewDataColumn>
                <telerikGridView:GridViewDataColumn DataMemberBinding="{Binding Column2}"
                                                            Width="0.4*"
                                                            UniqueName="Column2"
                                                            HeaderTextAlignment="Center">
                    <telerikGridView:GridViewDataColumn.Header>
                        <TextBlock HorizontalAlignment="Center"
                                           Text="Column 2" />
                    </telerikGridView:GridViewDataColumn.Header>
                </telerikGridView:GridViewDataColumn>
            </telerikGridView:RadGridView.Columns>

        </telerikGridView:RadGridView>

    </Grid>
</telerikNavigation:RadWindow>

 
In code-behind, I init a domainDataSource control and group one column of grid by code.

Imports Telerik.Windows.Controls.GridView
Imports Telerik.Windows.Data
Imports Telerik.Windows.Controls

Partial Public Class frmWindow
    Inherits RadWindow
    Private m_dss As DomainDataSource
    Public Sub New()
        InitializeComponent()

        If grd.GroupDescriptors.Count > 0 Then
            grd.GroupDescriptors.Clear()
        End If

        Dim cf As New CountFunction
        Dim descriptor As New ColumnGroupDescriptor
        descriptor.Column = grd.Columns("Column2")
        Me.grd.GroupDescriptors.Add(descriptor)
    End Sub

    Private Sub frmWindow_Loaded(sender As Object, e As System.Windows.RoutedEventArgs) Handles Me.Loaded
        m_dss = New DomainDataSource
        Me.DataContext = m_dss
    End Sub
End Class

Public Class DemoClass
    Public Property Column1 As String
    Public Property Column2 As String

    Public Sub New(m_Column1 As String, m_Column2 As String)
        Column1 = m_Column1
        Column2 = m_Column2
    End Sub
End Class

I debugged when show this form.
When I set DomainDataSource control to form's DataContext, application crashes.

I think there's something wrong with your gridview if it work with DomainDataSource and has a Grouped Column.
How can I fix this error? This error is very critical and I need to fix it soon.
Please reply to me ASAP

[Mike]

I am getting this same error.  Any fixes?

[Vlad]

Hi,

 Are you using our latest official version Q2 2012 Sp1?

Regards,
Vlad
the Telerik team

[Mike]

Nope, I am restricted to using version 2011.2.712.1040 because this is an existing application.

[Vlad]

Hi,

 In this case the only option will be to try to set DataType for the grouped column.

Regards,
Vlad
the Telerik team

[Mike]

What event would I attempt to do this in?  SomeGrid_DataLoaded?  Something like this -

 

 

var column = this.SomeGridView.Columns[0] as GridViewBoundColumnBase;

if (column != null)

{

    column.DataType =  typeof(string);

}