Do I have to wrapping something with <AdornerDecorator>?

[Trump]

I have a customized cell template.

<telerik:GridViewDataColumn Header="Contact" DataMemberBinding="{Binding CustAccountsLocationContact.FirstName}">
    <telerik:GridViewDataColumn.CellTemplate>
         <DataTemplate>
               <TextBox Text="{Binding SomeText, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
         </DataTemplate>
   </telerik:GridViewDataColumn.CellTemplate>
</telerik:GridViewDataColumn>

 

Now in Model class SomeText property there is a [required] attribute. Similar this, I created the error template as

<ControlTemplate x:Key="errorTemplate">
    <DockPanel>
        <Border BorderBrush="Red" BorderThickness="1">
            <AdornedElementPlaceholder x:Name="controlWithError"/>
        </Border>
        <TextBlock Foreground="Red" FontSize="20" FontFamily="Segoe UI" Margin="3,0,0,0"  MouseDown="Exclamation_MouseDown"  Tag="{Binding AdornedElement.(Validation.Errors)[0].ErrorContent, ElementName=controlWithError}">!</TextBlock>
    </DockPanel>
</ControlTemplate>

 

However I can not see the error template if validation failed. By the answer on stackoverflow, it seems need  to wrap some template with <AdornerDecorator>

Is it the solution to my case? If so, how to wrap it around telerik control?

Thank you.

[Trump]

Any help?

[Martin]

Hello, 

May I ask you what is your exact requirment and why you want to create a custom validation? I ask you because RadGridView provides the data validation which feature enables you to take complete control of the entered data. You can take a look at our Validating Data Through Data Annotations article where you can find how to achieve the similar behavior.


Regards,
Martin Vatev
Progress Telerik

[Trump]

Found the solution. I have to put the textbox in the StackPanel. Not sure why, but it works.

<telerik:GridViewDataColumn Header="Contact" DataMemberBinding="{Binding CustAccountsLocationContact.FirstName}">
    <telerik:GridViewDataColumn.CellTemplate>
         <DataTemplate>
             <StackPanel>
               <TextBox Text="{Binding SomeText, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
             </StackPanel>
         </DataTemplate>
   </telerik:GridViewDataColumn.CellTemplate>
</telerik:GridViewDataColumn>

[Martin]

Hello,

Thank you for sharing the workaround of the desired behavior the community. But keep in mind that for a scenario where the data should be validated, RadGridView provides its own data validation mechanism. 

Regards,
Martin Vatev
Progress Telerik