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cs5/5_7/Program.cs

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+using System;
+using System.Collections;
+namespace _5_7
+{
+    public class NameListEventArgs : EventArgs
+    {
+        public string Name { get; set; }
+        public int Count { get; set; }
+        public NameListEventArgs(string name, int count)
+        {
+            Name = name;
+            Count = count;
+        }
+    }
+    public delegate void NameListEventHandler(object source, NameListEventArgs e);
+    public class NameList
+    {
+        ArrayList list;
+        public event NameListEventHandler nameListEvent;
+        public NameList()
+        {
+            list = new ArrayList();
+        }
+        public void Add(string name)
+        {
+            list.Add(name);
+            if (nameListEvent != null)
+            {
+                nameListEvent(this, new NameListEventArgs(name, list.Count));
+            }
+        }
+    }
+    public class EventDemo
+    {
+        public static void Method1(object source, NameListEventArgs e)
+        {
+            Console.WriteLine("增加项目 {0}", e.Name);
+        }
+        public static void Method2(object source, NameListEventArgs e)
+        {
+            Console.WriteLine("当前项目总数 {0}", e.Count);
+        }
+        public static void Main()
+        {
+            NameList myList = new NameList();
+            myList.nameListEvent += new NameListEventHandler(Method1);
+            myList.nameListEvent += new NameListEventHandler(Method2);
+            myList.Add("张三");
+            myList.Add("李四");
+            myList.Add("王五");
+        }
+    }
+}