Custom WPF Binding

Question

I have a custom MarkupExtension that simulates binding. It works well in normal assignments but when used in Style Setters, for example:

Answer 1

Kind of guessing, but it's likely because the XAML compiler has special built-in support for the Binding class, allowing its usage in this scenario (and others). The Binding class is also a MarkupExtension, but unfortunately it seals its implementation of ProvideValue().

That said, you might just get away with this:

public class MyBinding : Binding
{
    private object value;

    public object Value
    {
        get { return this.value; }
        set
        {
            this.value = value;
            this.Source = value;
        }
    }
}

Since ProvideValue will return the Binding instance anyway.