Linq一些简单的用法

  

一.摘要

 

    很多人都开始使用LINQ ，代码看起来会很优雅。

 

二.前言

    

    这里简单的记录几种常用的LINQ 方法。

 

     

三 案例

 

 

       // 查询长度大于2的字符
            string[] values = { "巧巧", "李四", "林三哥", "王五" };
            var value = from v in values where v.Length > 2 select v;
            foreach (var item in value)
            {
                Console.WriteLine(item);
            }
            Console.WriteLine("--------------------------------------------");

            //检索包含王得字符
            var str = from v in values
                      where v.IndexOf("王") > -1
                      select v;

            foreach (var item in str)
            {
                Console.WriteLine(item);
            }


            Console.WriteLine("--------------------------------------------");

            ArrayList gList = new ArrayList();
            gList.Add(
                new GuestInfo { Name = "林晚荣", Age = 22, Tel = "88888888" }
                );

            gList.Add(
                new GuestInfo { Name = "宁雨昔", Age = 36, Tel = "55555555" }
                );

            var query = from GuestInfo guest in gList
                        where guest.Age > 19
                        select guest;
            foreach (GuestInfo item in query)
            {
                Console.WriteLine(item.Name, item.Age, item.Tel);
            }

            Console.WriteLine("--------------------------------------------");

            List<GuestInfo> glists = new List<GuestInfo>()
            {

                new GuestInfo{
                 Name = "林晚荣",
                 Age=21,
                 TelTable = new List<string>()
                 {
                      "026-88888888",
                      "13888888888"
                 }
                }
            };
            //查询13888888888
            var querys = from guest in glists
                         from tel in guest.TelTable
                         where tel.IndexOf("13888888888") > -1
                         select guest;
            foreach (var item in querys)
            {
                Console.WriteLine(item.Name, item.Age);

                foreach (var table in item.TelTable)
                {
                    Console.WriteLine(table);
                }
            }