linq-4

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace UsePredicateDelegate

{

    class Program

    {

        static void Main(string[] args)

        {

            new Program().PredicateDelegate();//调用自定义方法显示信息

        }

        public void PredicateDelegate()

        {

            List<User> P_List_user = new List<User>();//创建泛型集合

            //为泛型集合赋值

            P_List_user.Add(new User() { Name = "小刘", Age = 33, Pay = 5000 });

            P_List_user.Add(new User() { Name = "小王", Age = 30, Pay = 5000 });

            P_List_user.Add(new User() { Name = "小赵", Age = 32, Pay = 5000 });

            P_List_user.Add(new User() { Name = "小吕", Age = 30, Pay = 5000 });

            P_List_user.Add(new User() { Name = "小房", Age = 31, Pay = 5000 });

            string P_Str = string.Empty;//定义一个字符串变量，用来记录输出信息

            List<User> P_List_temp = P_List_user.FindAll(//在泛型集合中查找

                (pp) =>//定义匿名方法

                {

                    return pp.Age > 30;//指定查找条件

                });

            P_List_temp.ForEach(//遍历查询结果

                (pp) =>//定义匿名方法

                {

                    //记录查找到的信息

                    P_Str += "姓名：" + pp.Name + "   年龄：" +pp.Age.ToString() + Environment.NewLine;

                });

            Console.WriteLine(P_Str);//输出信息

            Console.ReadLine();

        }

        class User

        {

            public string Name { get; set; }//自动实现名称属性

            public int Age { get; set; }//自动实现年龄属性

            public double Pay { get; set; }//自动实现薪资属性

            public override string ToString()

            {

                return string.Format(

                    "姓名：{0}  年龄：{1}  工资：{2}", Name, Age, Pay);//对信息进行格式化

            }

        }

    }

}