Silverlight Binding to parent DataTemplate

Question

I have Array of Users and array of Roles. For each user i'am rendering list of roles. I want to bind checkboxes to some user property.

Here is my code ( line 38 ): https://gist.github.com/sadgb/30e2b75f2fff159bc26e#file-gistfile1-xml-L38

Why this line:

{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid}, Path=DataContext}

...binds to Role class, not to User class?

Binding should find grid at line 21, which has DataContext of type User isn't it?

Answer 1

There is another way: - 1. Give any name to your grid. 2. then do ur binding like this :

DataContext="{Binding ElementName=Gridname,Path=DataContext}"

Here is your edited code:

<DataTemplate DataType="usersService:User">
    <Grid Name="TheGrid">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0" Text="{Binding UserId}"/>
        <telerik:RadListBox Grid.Row="1"
    ItemsSource= "{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=users:UsersPage}, Path=RolesViewModel.Roles}" IsTextSearchEnabled="false">
            <telerik:RadListBox.ItemTemplate>
                <DataTemplate DataType="accessControlSubsystem:Role">
                    <StackPanel>
                        <CheckBox
                            IsChecked="{Binding ElementName=TheGrid,Path=DataContext , Converter={StaticResource CheckBoxToSelectedArrayConverter}, Mode=TwoWay}" Content="{Binding RoleName}" Tag="{Binding RoleId}" />
                    </StackPanel>
                </DataTemplate>
            </telerik:RadListBox.ItemTemplate>
        </telerik:RadListBox>
    </Grid>
</DataTemplate>

I guess this will solve your problem or at least give you a good start.

One more thing I noticed in your code is that you didn't specify the property name in your relative binding:

IsChecked="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid}, Path=DataContext.PopertyName, Converter={StaticResource CheckBoxToSelectedArrayConverter}, Mode=TwoWay}"  Content="{Binding RoleName}" Tag="{Binding RoleId}" 

Answer 2

Can you move the level up one using "ancestorLevel"

{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid}, AncestorLevel=1, Path=DataContext}

Oliver