C#中对linq where查询的应用

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using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace LINQ_WHERE{    /**//// <summary>    /// LINQ where子句    /// </summary>    class Program    {        static void Main(string[] args)        {            //1常见的where语句            List<GustInfo> gList = new List<GustInfo>()             {                new GustInfo(){ Name="DebugLZQ", Age=26,Tel="88888888"},                new GustInfo(){ Name="cnblogs",Age=6,Tel="666666"},                new GustInfo(){ Name="M&MSoft",Age=9,Tel="55555"}            };            var query = from gust in gList                        where (gust.Name.Length > 7 || gust.Name.Substring(0, 1) == "M") && gust.Age > 9                        select new { gust.Name, gust.Age };            foreach (var g in query)            {                Console.WriteLine("{0},{1}", g.Name, g.Age);            }            Console.ReadKey(false);            //2.在where子句中使用自定义函数            var query2 = from GustInfo gust in gList                         where gust.Name.Length > 5                         && Check(gust.Name)                         select gust;            foreach (var g in query2)            {                Console.WriteLine("{0},{1},{2}", g.Name, g.Age, g.Tel);            }            Console.ReadKey(false);            //3.动态谓词的筛选            //定义动态谓词数组,在实际开发中可以动态获得            string[] names = { "SB","XXX","***","@@@","一些敏感词"};            var query3 = from GustInfo guest in gList                         where !names.Contains(guest.Name)                         select guest;            foreach (var q in query3)            {                Console.WriteLine("{0} 年龄：{1},电话：{2}",q.Name,q.Age,q.Tel );            }            Console.ReadKey(false);        }        //自定义函数        static bool Check(string name)        {            if (name.Substring(0, 1) == "N")                return false;            return true;        }    }}
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