Unable to cast object of type 'Telerik.Windows.Controls.RadGridView' to type 'Telerik.Windows.Controls.GridView.GridViewDataControl'

[Natraj]

I am getting the above exception when I open a page that has a RadGridView, verified all teh references and removed and added them back with the same effect. Closing the application and opening it can fix it for a few seconds ..but it comes back.. Please help/suggest.

[Vlad]

Hello,

 Can you post more info about the grid version? Can you send us this project where we can replicate the problem?

Regards,
Vlad
the Telerik team

[Natraj]

This is happening only on one page where we have the below   <telerik:RadGridView.RowDetailsTemplate> ..
taking this code block out and closing and reopening blend fixes it. Once the exception occurs in Blend .. all telerik RadGridView pages fail to render ..


more ...
    <telerik:RadGridView.Columns>                  
more .....            
  </telerik:GridViewDataColumn>
       </telerik:RadGridView.Columns>
  <telerik:RadGridView.RowDetailsTemplate>
                    <DataTemplate>                        
                        <telerik:RadGridView IsReadOnly="True" AutoGenerateColumns="False" ShowGroupPanel="False"   Grid.Row="2"  
                            CanUserReorderColumns="False" CanUserResizeColumns="True" Width="1000"             
                            RowIndicatorVisibility="Collapsed" IsFilteringAllowed="True" MaxHeight="300" MinHeight="40"
                              ItemsSource="{Binding Path=AccountDetails}" telerik:StyleManager.Theme="Office_Blue" GridLinesVisibility="None">
                            <telerik:RadGridView.Columns>
                                <telerik:GridViewDataColumn x:Name="AccountNumber" Header="AccountNumber" DataMemberBinding="{Binding Path=AccountNumber, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=23}" Width="200" ToolTipTemplate="{StaticResource AccountNumberTooltip}"/>
                                <telerik:GridViewDataColumn x:Name="BillToAddress" Header="BillToAddress" DataMemberBinding="{Binding Path=BillToAddress, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=30}" Width="200" ToolTipTemplate="{StaticResource BillToAddressTooltip}"/>
                                <telerik:GridViewDataColumn x:Name="ShipToAddress" Header="ShipToAddress" DataMemberBinding="{Binding Path=ShipToAddress, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=30}" Width="200" ToolTipTemplate="{StaticResource ShipToAddressTooltip}"/>
                                <telerik:GridViewDataColumn x:Name="Notes" Header="Notes" DataMemberBinding="{Binding Path=Notes, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=60}" Width="400" ToolTipTemplate="{StaticResource NotesTooltip}"/>
                            </telerik:RadGridView.Columns>
                        </telerik:RadGridView>
                    </DataTemplate>
                </telerik:RadGridView.RowDetailsTemplate>

[Natraj]

posted too soon, it is not fixed.

            <telerik:RadGridView IsReadOnly="True" AutoGenerateColumns="False" ShowGroupPanel="False"   Grid.Row="2"  
                        CanUserReorderColumns="False" CanUserResizeColumns="True"             
                            RowIndicatorVisibility="Collapsed" IsFilteringAllowed="True" MaxHeight="400" MinHeight="40"
                             ItemsSource="{Binding TransactionProfileList, Mode=TwoWay}"   telerik:StyleManager.Theme="Office_Blue"
                             GridLinesVisibility="None">
                <telerik:RadGridView.Columns>
                    <telerik:GridViewToggleRowDetailsColumn />
                    <telerik:GridViewDataColumn x:Name="colSelect" Header="" TextAlignment="Center" IsFilterable="True">
                  ..................................
.........................................
                        </telerik:GridViewDataColumn.CellTemplate>
                    </telerik:GridViewDataColumn>
                </telerik:RadGridView.Columns>

                <telerik:RadGridView.RowDetailsTemplate>
                    <DataTemplate>                        
                        <telerik:RadGridView IsReadOnly="True" AutoGenerateColumns="False" ShowGroupPanel="False"   Grid.Row="2"  
                            CanUserReorderColumns="False" CanUserResizeColumns="True" Width="1000"             
                            RowIndicatorVisibility="Collapsed" IsFilteringAllowed="True" MaxHeight="300" MinHeight="40"
                              ItemsSource="{Binding Path=AccountDetails}" telerik:StyleManager.Theme="Office_Blue" GridLinesVisibility="None">
                            <telerik:RadGridView.Columns>
                                <telerik:GridViewDataColumn x:Name="AccountNumber" Header="AccountNumber" DataMemberBinding="{Binding Path=AccountNumber, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=23}" Width="200" ToolTipTemplate="{StaticResource AccountNumberTooltip}"/>
                                <telerik:GridViewDataColumn x:Name="BillToAddress" Header="BillToAddress" DataMemberBinding="{Binding Path=BillToAddress, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=30}" Width="200" ToolTipTemplate="{StaticResource BillToAddressTooltip}"/>
                                <telerik:GridViewDataColumn x:Name="ShipToAddress" Header="ShipToAddress" DataMemberBinding="{Binding Path=ShipToAddress, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=30}" Width="200" ToolTipTemplate="{StaticResource ShipToAddressTooltip}"/>
                                <telerik:GridViewDataColumn x:Name="Notes" Header="Notes" DataMemberBinding="{Binding Path=Notes, Mode=TwoWay, Converter={StaticResource TextTrimByCharacter},ConverterParameter=60}" Width="400" ToolTipTemplate="{StaticResource NotesTooltip}"/>
                            </telerik:RadGridView.Columns>
                        </telerik:RadGridView>
                    </DataTemplate>
                </telerik:RadGridView.RowDetailsTemplate>               
            </telerik:RadGridView>

[Vanya Pavlova]

Hello Natraj,

 

Most probably there is some inconsistency in the telerik assemblies you used.
Will you verify the telerik assemblies are all with the same version? It could be great if you may share whether the exception is reproduceable only in Expression Blend Environment or not. 
Also you may take a look at the following thread with an issue related to the yours, follow this link. 
If this does not help feel free to submit a new support ticket where you may attach your application. 
We may take a look at it and provide you with an appropriate solution. 

Kind regards,
Vanya Pavlova
the Telerik team