DataBinding of a UserControl via ControlTemplate

Question

Hello,

I'm playing around with the Infragistics xamDataGrid. I'd like to display in a "Field" (= Cell) a custom UserControl and have for it the Field's DataContext. Somehow the DataContext is always null :-)

Here is the XAML:

<UserControl.Resources>
    <Style x:Key="MyTestUserControl" TargetType="{x:Type igDP:CellValuePresenter}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
                    <myUC:MyTestUserControl DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value}" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="TextBoxField" TargetType="{x:Type igDP:CellValuePresenter}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
                    <TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value}" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</UserControl.Resources>

The DataContext for the TextBoxField works fine, but the DataContext for the MyUserControl doesn't.

Some more XAML where I define the Fields:

                    <igDP:UnboundField BindingPath="SimpleTestStringToDisplay" Label="UnboundField" >
                        <igDP:Field.Settings>
                            <igDP:FieldSettings CellValuePresenterStyle="{StaticResource TextBoxField}" />
                        </igDP:Field.Settings>
                    </igDP:UnboundField>

                    <igDP:UnboundField BindingPath="MyUserControlViewModel" Label="UnboundField (UserControl)">
                        <igDP:Field.Settings>
                            <igDP:FieldSettings CellValuePresenterStyle="{StaticResource MyTestUserControl}" />
                        </igDP:Field.Settings>
                    </igDP:UnboundField>

Does anyone have an idea what I'm doing wrong?

Thanks!

Cheers, Joseph

EDIT: I also tried something like this, without success:

  <myUC:MyUserControl DataContext="{TemplateBinding DataContext}" />

Answer 1

your test project above does not have the same bindings, it does in the templates but not on the <igDP:UnboundField>

try it using the same bindings and see if you still dont get a data context, then at least the experiment will be valid (isolated). maybe the issue is with your view model binding, try the follwing code -

<igDP:UnboundField BindingPath="MyUserControlViewModel" Label="UnboundField" >
  <igDP:Field.Settings>
    <igDP:FieldSettings CellValuePresenterStyle="{StaticResource TextBoxField}" />
  </igDP:Field.Settings>
</igDP:UnboundField>

<igDP:UnboundField BindingPath="MyUserControlViewModel" Label="UnboundField (UserControl)">
  <igDP:Field.Settings>
    <igDP:FieldSettings CellValuePresenterStyle="{StaticResource MyTestUserControl}" />
  </igDP:Field.Settings>
</igDP:UnboundField>

if you do this do both the templates not get their data context?. put a debugConverter (method 2) on your binding in the template, to make sure youre binding is happening.

By the way, what binding failure messages are you getting in your output window?