C#事件的几种处理方式

一、定义事件对象

namespace eventDemo
{
    class Name
    {
        private string pName;
        public delegate void myEventHandler(object sender, NameEventArgs e);
        public event myEventHandler Get;
        internal string Text
        {
            get { return this.pName; }
            set
            {
                this.pName = value;
                this.OnGet(new NameEventArgs("text属性被修改了"));
            }
        }

        private void OnGet(NameEventArgs nameEventArgs)
        {
            this.Get(this, nameEventArgs);
        }

        public override string ToString()
        {
            return "Name类的对象";
        }
    }
}

二、自定义NameEventArgs类

namespace eventDemo
{
    class NameEventArgs:EventArgs
    {
        string pArgs;
        public NameEventArgs(string s) {
            pArgs = s;
        }
        public override string ToString()
        {
            return pArgs;
        }
    }
}

三、客户端事件的注册

Name name=new Name();

1.直接注册事件

name.Get += new Name.myEventHandler(name_Get);
name.Text = "张三";

static void name_Get(object sender, NameEventArgs e)
        {
            Console.WriteLine("事件信息:{0}", e.ToString());
            Console.WriteLine("事件的发布者:{0}",sender.ToString());
            Console.WriteLine("你输入的名字是:{0}", ((Name)sender).Text);
        }

2.使用匿名方法，直接将方法体的代码和委托对象关联

   Name name = new Name();
            name.Get += delegate(object sender, NameEventArgs e)
            {
                Console.WriteLine("事件信息:{0}", e.ToString());
                Console.WriteLine("事件的发布者:{0}", sender.ToString());
                Console.WriteLine("你输入的名字是:{0}", ((Name)sender).Text);
            };
            name.Text = "张三";

3.使用lambda表达式

   //1、注册事件
            //name.Get += new Name.myEventHandler(name_Get);
            //name.Text = "张三";

            //2、匿名方法，直接将方法体的代码和委托对象关联
            //Name name = new Name();
            //name.Get += delegate(object sender, NameEventArgs e)
            //{
            //    Console.WriteLine("事件信息:{0}", e.ToString());
            //    Console.WriteLine("事件的发布者:{0}", sender.ToString());
            //    Console.WriteLine("你输入的名字是:{0}", ((Name)sender).Text);
            //};
            //name.Text = "张三";

            //3、lambda表达式
            name.Get += (object sender, NameEventArgs e) => {
                Console.WriteLine("事件信息:{0}", e.ToString());
                Console.WriteLine("事件的发布者:{0}", sender.ToString());
                Console.WriteLine("你输入的名字是:{0}", ((Name)sender).Text);
            };
            name.Text = "张三";
            Console.ReadKey();