ASP.NET中LINQ的基本用法南 墙-

此Demo只是一个极其简单的LINQ查询Demo 

一个类

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApp1 { public class NBA_Star { public string FirstName { get; set; } public string LastName { get; set; } public int Champion { get; set; } } } 

主类的代码LINQ的代码

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;  namespace ConsoleApp1 { class Program { static void Main(string[] args) {             var nba_stars = new List<NBA_Star> { new NBA_Star{ FirstName="迈克尔", LastName="乔丹", Champion=6}, new NBA_Star{ FirstName="蒂姆", LastName="邓肯", Champion=5}, new NBA_Star{ FirstName="勒布朗", LastName="詹姆斯", Champion=3}, new NBA_Star{ FirstName="史蒂芬 ", LastName="库里", Champion=3}, new NBA_Star{ FirstName="史蒂夫 ", LastName="纳什", Champion=0} }; //查询语法查询出，至少得到5个总冠的球星              var starts = from star in nba_stars                          where star.Champion >= 5                          select new {                              Name = star.FirstName + "." + star.LastName,                              Champion = star.Champion                          };             Console.WriteLine("至少五个总冠军的球星");             foreach (var item in starts) {                 Console.WriteLine($"姓名：{item.Name},总冠军:{item.Champion}"); }             Console.WriteLine(); //查找至少得到5个总冠的球星的Lambda             var starts2 = nba_stars.Where(s => s.Champion >= 5).Select(s => new {                 Name = s.FirstName + "." + s.LastName,                 Champion = s.Champion             });              foreach (var item in starts2) {                 Console.WriteLine($"姓名：{item.Name},总冠军:{item.Champion}"); }             Console.WriteLine(); //五个总冠军的人数             var starts3 = nba_stars.Where(s => s.Champion >= 5).Count();             Console.WriteLine("至少得到5个总冠的球星人数"+starts3);             Console.WriteLine(); //最后一个冠军             var last_star = nba_stars.LastOrDefault();             Console.WriteLine("最后一个夺冠球星"+last_star.FirstName+"."+last_star.LastName);             Console.WriteLine(); //得到六冠的球星是             var Six_Star = nba_stars.Select(ss => new {                 Name = ss.FirstName + "." + ss.LastName,                 Champion = ss.Champion             }).FirstOrDefault(s => s.Champion == 6);             Console.WriteLine($"得到6冠的球星是{Six_Star.Name}");             Console.WriteLine(); } } } 

也是为了方便以后用到找不到的时候，可以来自己博客查看