c#4.0中的动态编程

using System;
using System.Collections.Generic;
using System.Dynamic;
namespace DynamicTest
{
    class Program
    {
        public static void Main(string[] args)
        {
            dynamic obj = new ExpandoObject();

            //动态添加一些属性
            obj.name = "Jimmy";
            obj.age = 30;

            //动态添加一个方法
            obj.sayHello = new Action<string>(SayHello);

            foreach (var item in (IDictionary<string, object>)obj)
            {
                if (item.Key == "sayHello")
                {
                    //调用动态添加的方法
                    Action<string> a = item.Value as Action<String>;
                    a("CLR 4.0");
                }
                else
                {
                    Console.WriteLine("key={0},value={1}", item.Key, item.Value);
                }
            }

            Console.WriteLine("-----------------------------------------------");

            var d = (IDictionary<string, object>)obj;
            d.Remove("name");//删除name属性
            d.Remove("sayHello");//删除动态添加的方法
            d.Remove("notExist");//删除一个并不存在的东西（不会引发异常）

            foreach (var item in (IDictionary<string, object>)obj)
            {
                Console.WriteLine("key={0},value={1}", item.Key, item.Value);
            }

            Console.Read();
        }

        public static void SayHello(string msg)
        {
            Console.WriteLine("Hello,{0}!", msg);
        }

    }
}