C#接口多态实例

C#用接口实现传递不同的类的多态

接口及类的定义

//定义接口，define interface
    interface IAction
    {
        string Act();
    }
    /// <summary>
    /// 类A继承接口，class a inherit interface IAction
    /// </summary>
    class InterfaceTest :IAction
    {
        public string Act()
        {
            return "this class a.Act";
        }
    }
    /// <summary>
    /// 类B继承接口，class a inherit interface IAction
    /// </summary>
    class Bclass : IAction
    {
        public string Act()
        {
            return "this class b.Act";
        }
    }
    /// <summary>
    /// 类C定义方法以IAction接口为参数，class C set the interface as parameter
    /// </summary>
    class Cclass
    {
        public string CallFun(IAction action)
        {
            return action.Act();
        }
    }

调用 

//实例化类，instantiate
InterfaceTest aclass = new InterfaceTest();
Bclass bclass = new Bclass();
Cclass cclass = new Cclass();
//将类做参数传递调用各种的方法，use the class as parameter to call different functions
MessageBox.Show(cclass.CallFun(bclass)+"\n"+ cclass.CallFun(aclass));