为什么动态无法在动态构建的对象上调用方法？

Question

I have a type that I build with TypeBuilder to match an interface, like this::

interface IFoo
{
     int Property{get;}
}

My code builds the get_Property method. If I cast my built object as an IFoo, everything works. However, when I use the object as a dynamic the the code complains that my IFoo does not implement get_Property. Why is this happening, can I not use the dynamic functionality with types built at runtime?

Answer 1

dynamic uses the public API. If you are using TypeBuilder it is possible that you have just provided a method and marked it as implementing that method, in which case it is (essentially) an explicit interface implementation, and undiscoverable by dynamic . To use dynamic it would probably need PropertyBuilder and a public property, with the property implementation method also marked as the interface implementation.

For comparison, dynamic would also fail with:

class Foo : IFoo {
    int IFoo.Property { get {return 5;}}
}