委托和回调函数例子

public delegate void OutPutMsgHandler(string name);


/// <summary>
/// 入口类
/// </summary>
class DelegateClass
{
    static void Main(string[] args)
    {
        Console.WriteLine("程序运行开始……");
        //利用多播委托
        OutPutMsgHandler callbackClass = new OutPutMsgHandler (MethodClass.EnglishGreeting);
        callbackClass += MethodClass.ChineseGreeting;
        new CallBackMethod().DoOutputMessge("zhangsan", callbackClass);
        Console.WriteLine("程序运行结束……");

        Console.ReadLine();
    }
}

public class CallBackMethod
{
    /// <summary>
    /// 回调函数，把方法作为参数传入。
    /// </summary>
    /// <param name=" name "></param>
    /// <param name="callbackMethod"></param>
    public void DoOutputMessge(string name, OutPutMsgHandler callbackMethod)
    {
        callbackMethod(name);
    }
}


/// <summary>
/// 方法类，全部为静态方法，测试调用
/// </summary>
public class MethodClass
{
    public static void EnglishGreeting(string name)
    {
        Console.WriteLine(name + "Morning");
    }

    public static void ChineseGreeting(string name)
    {
        Console.WriteLine(name + "早上好");
    }
}