语法之进化论之lambda表达式

namespace 匿名函数
{
    /// <summary>
    /// 语法之进化论
    /// </summary>
    class Program
    {
        delegate bool MetherdDeleget(string pStr);
        static void Main(string[] args)
        {
            //m指向匿名函数 delegate(参数列表) {方法体 };
            MetherdDeleget m = delegate(string s) { Console.WriteLine(s); return false; };
            m("匿名函数");
            //lambda
            MetherdDeleget m1 = (s) => { Console.WriteLine(s); return false; };
            m("lambda");
            //进一步1：
            MetherdDeleget m2 = (s) => {  return s=="tom"; };
            Console.WriteLine(m2("tom"));
            //当方法体只有一句话，且有返回值时,写法上可以进一步简化：
            //甚至如果只有一个参数的话() 也不必写
            MetherdDeleget m3 = (s) => s == "tom";
            Console.WriteLine(m3("tom"));
            //////////list的复杂类型排序///////////////////
            List<Person> plist = new List<Person>();
            plist.Add(new Person() { Name = "tom", Age =  });
            plist.Add(new Person() { Name = "jim", Age =  });
            plist.Add(new Person() { Name = "aaa", Age =  });
            plist.Add(new Person() { Name = "bbb", Age =  });
            plist.Add(new Person() { Name = "ccc", Age =  });
            plist.Add(new Person() { Name = "ddd", Age =  });
            foreach(Person eachp in plist.OrderBy(p=>p.Age))
            {
                Console.WriteLine("名字：{0} 年龄：{1}",eachp.Name,eachp.Age);
            }
            foreach (Person eachp in plist.OrderByDescending(p => p.Age))
            {
                Console.WriteLine("名字：{0} 年龄：{1}", eachp.Name, eachp.Age);
            }

            Console.ReadKey();
        }

    }
    class Person
    {
        public string Name { set; get; }
        public int Age { set; get; }
    }
}

转至 杨中科教程