ASP.NET接口的基础使用例子

using System;
namespace ConsoleApplication
{
    internal interface IMyHandler     //接口
    {
        void SayHello();
        void SayMsg(string msg);
    }
    class MyHandlerA : IMyHandler     //具体实现类A
    {
        public void SayHello()
        {
            Console.WriteLine("Hello from MyHandlerA");
        }
        public void SayMsg(string msg)
        {
            Console.WriteLine(msg+" from MyHandlerA");
        }
    }
    class MyHandlerB : IMyHandler     //具体实现类B
    {
        public void SayHello()
        {
            Console.WriteLine("Hello from MyHandlerB");
        }
        public void SayMsg(string msg)
        {
            Console.WriteLine(msg + " from MyHandlerB");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            //实现化A,用接口类型来声明
            IMyHandler myHandler = new MyHandlerA();
            myHandler.SayHello();
            //实现化B
            myHandler = new MyHandlerB();
            myHandler.SayHello();
            Write(myHandler);
            Console.Read();
        }
        //接口作为参数类型
        static void Write(IMyHandler myControl)
        {
            myControl.SayMsg("Hello World!!!");
        }
    }
}