using System;

namespace 编码练习
{
    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
    class ExtensionMethod
    {
        public static void Main(string[] args)
        {
            var person = new Person()
            {
                Name = "张三",
                Age = 15
            };
　　　　　　　//使用扩展方法
            person.SayHello();
            Console.ReadKey();
        }
    }
}

using System;

namespace 编码练习
{
    //Person方法扩展
    public static class PersonExtension
    {
        public static void SayHello(this Person person)
        {
            Console.WriteLine("{0}说“你好”", person.Name);
        }
    }
}