CODEWITHSUNDEEP
wpfxamluser-controls
dlf
dlf

Reputation: 9403

UserControl: Can I set my own DependencyProperty in XAML?

I'd like to be able to do something like this:

.xaml.cs:

public partial class MyControl : UserControl
{
    public MyControl() => InitializeComponent();

    public static readonly DependencyProperty MyTemplateProperty = DependencyProperty.Register(
        "MyTemplate", typeof(DataTemplate), typeof(MyControl), new PropertyMetadata(default(DataTemplate)));

    public DataTemplate MyTemplate
    {
        get => (DataTemplate) GetValue(MyTemplateProperty);
        set => SetValue(MyTemplateProperty, value);
    }
}

.xaml: 

<UserControl x:Class="MyControl"> <!-- etc. -->
    <Grid />

    <!-- does not compile-->
    <UserControl.MyTemplate>
        <DataTemplate />
    </UserControl.MyTemplate>
</UserControl>

But it doesn't work. Not-so-surprisingly, when you start an element name with UserControl, the compiler only looks for properties defined on UserControl itself. But changing the element name to <MyControl.MyTemplate> (with the proper namespace prefix) doesn't work either; the compiler tries to interpret MyTemplate as an attached property in this case.

Is there any way to achieve this aside from defining the value in a resource and then assigning it to the property from codebehind?

Upvotes: 2

Views: 32

Answers (1)

Clemens
Clemens

Reputation: 128145

You can set the property by a Style:

<UserControl ...>
    <UserControl.Style>
        <Style>
            <Setter Property="local:MyControl.MyTemplate">
                <Setter.Value>
                    <DataTemplate />
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Style>
    ...
</UserControl>

Upvotes: 2

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