定义泛型类

class MyGenericClass<T1,T2,T3>

{

　　private T1 innerT1Object;

　　public MyGenericClass()

　　{

　　　　innerT1Object = default(T1);

　　}

}

约束

class MyGenericClass<T1,T2> where T1:constraint1 where T2:constraint2

{

　　...

}

class MyGenericClass<T1,T2> where T2:T1