Microsoft-ui-xaml: Is there a way to set the property of type 'Type' from xaml?

[BorzillaR]

I have a WinUI/UWP project. In my custom control I have a property of type Type. I tried to set it from xaml like ControlTemplate.TargetType property, but got an exception on InitializeComponent.

Windows.UI.Xaml.Markup.XamlParseException: 'The text associated with this error code could not be found.

Failed to assign to property 'App11.MyControl.SomeProperty'. [Line: 17 Position: 26]'

Is there a way to set such properties from xaml?

Sample control

public class MyControl : Button
{        
        public Type SomeProperty { get; set; }
}

Xaml

<local:MyControl SomeProperty="Button" />

[ranjeshj]

we don't have x:Type in WinUI. @MikeHillberg is there a way to achieve this ?

[MikeHillberg]

I don't think so, and I can't find an existing Issue on it. It's supported for built-in properties (like Style.TargetType) but missing for custom properties. @alwu-msft?

[alwu-msft]

This works for me (my test app) whether the custom property of type System.Type is a DependencyProperty or a regular C# property.

@BorzillaR can you attach your repro project? It's possible my test app isn't doing the same thing as yours and that is responsible for the difference in behavior.

[BorzillaR]

@alwu-msft, seems you created a classic UWP project and it works on my side. I created the same project for WinUI/UWP and it fails. Looks like a bug.

[alwu-msft]

Thanks! You're right, the Windows.UI.Xaml.Markup.XamlParseException text displayed by VS tricked me into thinking that you were using UWP XAML rather than WinUI 3.

As it turns out, this is a known issue that we're already working on fixing, but we appreciate the report nonetheless!

[RealTommyKlein]

This will be fixed in the WinUI 3 Preview 2 release.