给定一个Object，我如何以编程方式告诉它支持哪些接口？

Given this:

Interface IBase {string X {get;set;}}
Interface ISuper {string Y {get;set;}}

class Base : IBase {etc...}
class Super : Base, ISuper {etc...}

void Questionable (Base b) {
  Console.WriteLine ("The class supports the following interfaces... ")
  // The Magic Happens Here
}
Interface IBase {string X {get;se