事件简单示例

 1 public partial class TestForm : Form
    {
        public TestForm()
        {
            InitializeComponent();
        }

        private void TestForm_Load(object sender, EventArgs e)
        {
            TestClass.testDelegateEvent += new TestClass.TestDelegate(TestClass_testDelegateEvent); //1
            TestClass tc = new TestClass();//2
            tc.GetInfo("aaaa");//3
        }

        public void TestClass_testDelegateEvent(string msg)
        {
            msg += "!@#$";//7
            MessageBox.Show(msg);//8
        }
    }

    public class TestClass
    {
        public delegate void TestDelegate(string msg);
        public static event TestDelegate testDelegateEvent;

        public void GetInfo(string msg)
        {
            msg += "1234567890";//4
            if (testDelegateEvent != null)//5
                testDelegateEvent(msg);//6
        }
    }

C#事件简单示例，//1  //2  ....表示执行顺序