Question

Why doesn’t this work:

 <Style TargetType="s:Substance">
    <Setter Property="Template">
        <Setter.Value>
            <DataTemplate>
                <StackPanel>
                    <TextBlock Text="{TemplateBinding Name}"/>
                    <TextBox Text="{TemplateBinding Count}"/>
                </StackPanel>
            </DataTemplate>
        </Setter.Value>
    </Setter>
</Style>

If I switch to ControlTemplate it works, but I need a data template. Also, if I replace Template with DataTemplate it doesn’t recognize the property. Does anyone know what is going on? Thank you.

NOTE: Substance derives from FrameworkElement. It is not a control.

Answer 1

You don’t seem to know what you are doing, Template expects a ControlTemplate, this property sets the template of the control itself, not its data.

Does your Substance control even have any property that expects a DataTemplate? e.g. ContentTemplate (if it is a ContentControl) or ItemTemplate (if it is an ItemsControl)?

Edit: You probably just want to do this:

<Some.Resources>
    <DataTemplate DataType="{x:Type s:Substance}"> <!-- The use of x:Type is important! -->
        <StackPanel>
            <TextBlock Text="{Binding Name}"/>
            <TextBox Text="{Binding Count}"/>
        </StackPanel>
    </DataTemplate>
</Some.Resources>

Which defines a datatemplate for Substance; Wherever Substance is added as content or item, that datatemplate will be automatically applied.