Specifying DataTemplate.DataType with a custom type extension

Question

I have this markup extension

public class NullableExtension : TypeExtension
{
    public NullableExtension() {
    }

    public NullableExtension( string ty         


        

Answer 1

I found a nasty workaround for this. For whatever reason, @Anvaka is right: the DataType property won't allow you to use a custom MarkupExtension. But it WILL allow you to use a StaticResource of the custom MarkupExtension.

Take your MarkupExtension, add a public default constructor to it. Then create an instance of your extension in the resources, setting the properties directly. Boom, it takes it. The below is similar to what you would need to do