事件学习

 

主函数的代码：

 static void Main(string[] args)
        {
            Cat Tom = new Cat("Tom", 3);
            Tom.CatCream += new Cat.CatCreamHandler((new Mouse()).RunAway);
            Tom.CatCream += new Cat.CatCreamHandler((new Master()).Waken);
            Tom.Cream(new CatCreamEventArgs(Tom.Name,Tom.Age));
         }

 猫：

public class Cat
        {
            private string name;
            private int age;
            public string Name
            {
                get
                {return this.name;}
                set
                {this.name = value;}
            }

            public int Age
            {
                get { return this.age; }

                set { age = value; }

            }

            public Cat(string name, int age)
            {
                this.name = name;
                this.age = age;
            }
            public delegate void CatCreamHandler(object sender, CatCreamEventArgs e);
            public event CatCreamHandler CatCream;
            public void Cream(CatCreamEventArgs e)
            {
                if (null != CatCream)
                { CatCream(this, e);//激活一个事件}
            }
        }

事件参数类：

   public class CatCreamEventArgs : EventArgs
        {
            public readonly string catName;
            public readonly int catAge;
            public CatCreamEventArgs(string name, int age)
            {
                catName = name;
                catAge = age;
            }
        }

事件监听者，老师和人：

   public class Mouse
        {

            public void RunAway(object sender, CatCreamEventArgs e)
            {

                Console.Write("the {0} is come,run away", e.catName);
            }
        }

        public class Master
        {
            public void Waken(object sender, CatCreamEventArgs e)
            {
                Console.Write("the {0} is cream ,wake up", e.catName);
            }
        }

    1.事件使用总结
    2.有一个受监视着，有一个或者都个监视着
    3.受监视者需要定义委托，定义委托之后再定义一个包装该委托的事件
    4.在监视者中声明当事件被触发时的方法，即事件需要注册的方法