How to bind the Command property of the ItemTemplate CheckBox to ViewModel object's property?

Question

Let me ask this question with a pseudo code:



<Window>
    <ListView ItemsSource="{Binding PersonCollection}">
        <ListView.ItemTemplate>
            <DataTemplate>
                <StackPanel>
                    <TextBlock Text="{Binding Path=Name}" />
                    <TextBlock Text="{Binding Path=Age}" />
                    <TextBlock Text="/" />
                    <CheckBox Command="{Binding PersonSelectedCommand}" />  <!-- Where "PersonSelectedCommand" is a public command property available in ViewModel object (lets say "Contacts"  in this context)-->
                </StackPanel>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</Window>

Where
"Contacts" the ViewModel object set as the DataContext for the window.

"Contacts" has "PersonCollection" , public ICommand PersonSelectedCommand properties. "PersonCollection" is List

"Person" has Name, Age properties

Currently this is not working as CheckBox is trying to find and bind the ICommand "PersonSelectedCommand" property of object "person", which does not exists!

How will bind the CheckBox to the ICommand "PersonSelectedCommand" property of object "Contact"

Thanks and regards
123Deveopler

Ray Burns Ray Burns · Accepted Answer · 2010-06-17T06:34:04

I liked SeeSharp's answer, but to directly answer your question, all you need to do is change your CheckBox's Command binding to:

Command="{Binding DataContext.PersonSelectedCommand,
                  RelativeSource={RelativeSource FindAncestor,ListView,1}}"

This is preferable to SeeSharp's answer only when you need more control than simply binding the IsSelected property will give you. Otherwise go with binding IsSelected.

How to bind the Command property of the ItemTemplate CheckBox to ViewModel object's property?

3 Answers