协变:子类向父类或基类转化- public class A { }
- public class B : A { }
- public class C : B { }
- class Program
- {
- public static A T1() { return new A(); }
-
- public static B T2(){ return new B();}
- public static C T3() { return new C(); }
- public delegate object testDeleg();
- //public delegate A testDeleg();
- static void Main(string[] args)
- {
- testDeleg testDeleg = T1;
- testDeleg testDeleg1 = T2;
- testDeleg testDeleg2 = T3;
- }
- }
复制代码 逆变:父类向子类转化- public class A { }
- public class B : A { }
- public class C : B { }
- class Program
- {
- public static void T1(A a) { }
- public static void T2(B b) { }
- public static void T3(C c) { }
- public delegate void TestDelegate(C c);
- public static TestDelegate dele;
- static void Main(string[] args)
- {
- dele += T1;
- dele += T2;
- dele += T3;
- }
- }
复制代码
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