C# 语法 ( linq查询语句 )

Posted 2020-08-28

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace λ表达式
{
    class VarLinq
    {
        public void show()
        {
            //筛选出集合中年龄小于20的
            List<User> userList = new List<User>()
            {
                new User("张三", 21),
                new User("李四", 20),
                new User("王五", 15),
                new User("陆六", 25)
            };

            //方式一:基于linq
            var linqLiset = from u in userList
                            where u.Age >= 20
                            select u;
            foreach (User u in linqLiset)
            {
                Console.WriteLine(u);
            }

            Console.WriteLine("*************************");

            //方法二:基于λ表达式
            var lambdaList = userList.Where<User>(u => u.Age >= 20);
            foreach (User u in lambdaList)
            {
                Console.WriteLine(u);
            }
        }
    }
}