GridViewDataControl Exception Internal Build

[James]

Hello,

I am getting the following exception with the latest internal build (and also the previous build) :

Line: 54
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.Controls.GridView.GridViewDataControl.OnApplyTemplate()
   at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)    

The last internal build that does not have this exception is 2009.3.19

Any ideas?

James

[James]

That was a mistake, I meant 2010.3.19 was the last version that worked without an exception.

[Rossen Hristov]

Hi James,

Please, open a support ticket and send us your project. We cannot guess what is going on without having anything to look at. Thanks in advance.

All the best,
Ross
the Telerik team

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[James]

Hi,

I have found the problem - there appears to be a dependency on element "PART_GroupPanel" that did not exist before.

Please see my template below - if I remove the PART_GroupPanel element then I get the above exception. My work around is to make it collapsed, but ideally I don't want to include elements that are of no use to me, so I can optimize performance.

Are you able to replicate?

James

    <ControlTemplate x:Key="GridViewTemplate" TargetType="Controls:RadGridView">
        <Border x:Name="PART_MasterGridContainer"
                BorderBrush="{TemplateBinding BorderBrush}"
                BorderThickness="{TemplateBinding BorderThickness}">
            <Grid x:Name="HierrarchyBackground" Background="{TemplateBinding Background}">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition/>
                    <ColumnDefinition x:Name="ScrollBarColumn" MinWidth="0" Width="0"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition x:Name="ScrollBarRow" Height="0" MinHeight="0"/>
                </Grid.RowDefinitions>
                <Telerik_Windows_Controls_GridView:GridViewGroupPanel x:Name="PART_GroupPanel" Visibility="Collapsed" />
                <Telerik_Windows_Controls_GridView:GridViewScrollViewer x:Name="PART_ItemsScrollViewer"
                                                                        Background="Transparent"
                                                                        Grid.ColumnSpan="2"
                                                                        Grid.RowSpan="2"
                                                                        Style="{StaticResource GridViewScrollViewerStyle}"
                                                                        CanContentScroll="True">
                    <Telerik_Windows_Controls_GridView:GridViewScrollViewer.HeaderRow>
                        <Telerik_Windows_Controls_GridView:GridViewHeaderRow x:Name="PART_HeaderRow" IndentLevel="{TemplateBinding GroupCount}"/>
                    </Telerik_Windows_Controls_GridView:GridViewScrollViewer.HeaderRow>
                    <Telerik_Windows_Controls_GridView:GridViewVirtualizingPanel x:Name="PART_GridViewVirtualizingPanel"/>
                </Telerik_Windows_Controls_GridView:GridViewScrollViewer>
            </Grid>
        </Border>
    </ControlTemplate>

[Rossen Hristov]

Hello James,

We are looking for this part from our code-behind. Please, do not remove it. Simply hide it.

We will think about changing our code to simply go on if it does not find some part.

I hope this helps.

All the best,
Ross
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.