C#扩展方法的应用

public class Service
    {
        private string _name;

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
        private string _age;

        public string Age
        {
            get { return _age; }
            set { _age = value; }
        }
        public Service(string name, string age)
        {
            this.Age = age;
            this.Name = name;
        }
    }

 public static class KuoService
    {
        //给Service类添加扩展方法，使用this关键字
        public static void SayHi(this Service strs)
        {
            Console.WriteLine("...{0}...{1}", strs.Name, strs.Age);
        }
    }

Service ser = new Service("xsl","26");
 ser.SayHi();
 Console.ReadKey();