DependencyProperty for generic class

[fubar-coder]

Currently, DependencyPropertyAttribute requires the specification of the type as typeof(T), which isn't possible, if the class is generic and the produced function should use the type of the generic type argument.

Problem

// Usage of "typeof(T)" isn't allowed (obviously), but
// there's no way to specify a type, which depends
// on the generic type argument.
[DependencyProperty("MyValue", typeof(T)))]
class MyWindow<T> : Window
{
}

Desired result

class MyWindow<T> : Window
{
    public static readonly DependencyProperty MyValueProperty =
        global::System.Windows.DependencyProperty.Register(
            name: "MyValue",
            propertyType: typeof(T),
            ownerType: typeof(global::H.Generators.IntegrationTests.MyWindow<T>),
            typeMetadata: new global::System.Windows.FrameworkPropertyMetadata(
                defaultValue: default(T)),
            validateValueCallback: null);

    public T MyValue
    {
        get => (T)GetValue(MyValueProperty);
        set => SetValue(MyValueProperty, value);
    }
}

Possible definition

[DependencyProperty("MyValue", "T"))]
class MyWindow<T> : Window
{
}

Thoughts

This would also allow - for example - properties of types, which use the generic type argument:

[DependencyProperty("MyObservable", "IObservable<T>"))]
class MyWindow<T> : Window
{
}

Also, only the DefaultValueExpression would be supported, but not the DefaultValue.