Editable ItemsControl DataTemplate with MVVM pattern on WPF 4.0

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I've got problem to define items in my ItemsControls (or in my view or viewModel). May be I don't know something about mvvm, but here is the question. I have DataTemplate defined as

XML

<DataTemplate>
    <Expander>
        <Expander.Header>
            <StackPanel>
            <TextBlock Margin="2" Text="{Binding Name}" />
            <TextBlock>
                <Hyperlink>
                    <Run Text="Delete group" />
                </Hyperlink>
            </TextBlock>
            </StackPanel>
        </Expander.Header>
        <Expander.Content>
            blah-blah-blah
        </Expander.Content>
     </Expander>
 </DataTemplate>

I have a lot of Expanders, each of them have Hyperlink. And I want Hyperlink will do what it must do - delete group - i.e. remove corresponding Expander. I have read about searching on DataTemplate with Visual and Logical - TreeHelper, but it is bad action - it is not mvvm. I know that I need to wrote some Commmand for Hyperlink, but how can I retrive Expander, which I need to delete, and satisfy mvvm - thats the question.

Any advice, any suggestion...

Posted 26-Jun-11 21:52pm

stukselbax

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theHollow · Accepted Answer · 2011-09-18T22:43:00

Hello
You should make a Command, like you mentioned.

You can access the Command in many ways, like this for one example:

XML

<Hyperlink Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}, Path=DataContext.RemoveExpanderCommand, Mode=OneWay}" CommandParameter="{Binding Path=.}">
  <Run Text="Delete group" />
</Hyperlink>

This example will fint the first Window ancestor. Change it to "UserControl" if you have a UserControl, or to the control name if you have a TemplatedControl.

Note : The are lots of ways to retrieve the command.
You can also use :

Command="{Binding RelativeSource={RelativeSource Mode=TemplatedParent} (...)

to access the "ItemsControl" directly.

You can also use :

Command="{Binding ElementName=MyElementName (...)

to access a specific control by the x:Name property.

I added "CommandParameter" with Path=. to send the current item to the Command, because the "ItemsControl" does not support "SelectedItem".

Then I remove the item from the list.

C#

private void doRemoveExpander(MyClass param)
{
    this.Items.Remove(param);
}

"Items" is a ObservableCollection<Myclass> which holds the items to view in the list. It is given in the "ItemsSource" for the ItemsControl.

Hope that helped a little :-)