c#-泛型-抽象继承

代码

using System;
abstract class A<T>{
	abstract public T fun(T t);	
}
class ASub:A<B>{
	public override B fun(B t){
		return t;
	}
}
class B{
	public int a = 5;
}
public class Fanxing{
	public static void Main(){
		Console.WriteLine("hello word");
		ASub ab = new ASub();
		B b = new B();
		B b2 = ab.fun(b); 
		Console.WriteLine(b2.a);
	}
}