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GridViewDataControl Exception Internal Build

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James
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James asked on 03 Apr 2010, 05:03 AM
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

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James
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answered on 03 Apr 2010, 05:15 AM
That was a mistake, I meant 2010.3.19 was the last version that worked without an exception.
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Rossen Hristov
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answered on 05 Apr 2010, 02:02 PM
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
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James
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answered on 14 Apr 2010, 08:37 AM
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> 
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Rossen Hristov
Telerik team
answered on 14 Apr 2010, 09:50 AM
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

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Rossen Hristov
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