using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Test.Other{    public class TestDelegateAndEvent    {        public delegate void TestDelegate();        public event TestDelegate TestEventHandler;        public void Test()        {            TestDelegate testDelegate = new TestDelegate(Test1);            TestEventHandler += new TestDelegate(Test1);            testDelegate();            TestEventHandler();        }        public void Test1()        {        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Test.Other{    class Program    {        //public static delegate void TestDelegate();        //public static event TestDelegate TestEventHandler;        static void Main(string[] args)        {            // Delegate can be triggered directly            //TestDelegate testDelegate = new TestDelegate(Test);            //testDelegate();            //TestDelegateAndEvent test = new TestDelegateAndEvent();            //test.TestEventHandler += Test;            // Error: The delegate inner the class is private even if the type is public.            // test.TestDelegate();            // Error: Event can't be triggered directly.            //test.TestEventHandler();            Console.ReadLine();        }        public static void Test()        {            Console.WriteLine("test");        }    }}

总结：

1. Delegate可以将方法作为另外一个方法的参数带入其中进行运算；

2. 实际上Delegate和Event都是类，Event是一种特殊类型的Delegate；

3. 类内的Delegate不能被对象调用，即便这个delegate是Public的；

4. delegate和event都重载了+=，-=， 但是delegate可以用=直接赋值，但是event不可以；

5. delegate和event都不能由对象直接触发；

6. delegate和event都不能是static.