对继承类的依赖属性，忽略默认值

Question

When I write

public class A : Control
{
    static A()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(A), new FrameworkPropertyMetadata(typeof(A)));
    }
}

public class B : A 
{
}

A shows its style correctly but B doesn't have A 's style
But if I inherit Button for example, inherited control displays as button correctly

Why does it work for Button but not for my control?

Answer 1

Because you are running that line of code inside the constructor of your class A. When you instantiate class B, constructor of B will run and not A. You could try doing something like this:

public class A : Control
{
    static A()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(A), new FrameworkPropertyMetadata(typeof(A)));
    }
}

public class B : A 
{
     static B : base()
     {
     }
}