C# LINQ的基本使用方法示例

//武林高手
class MatialArtsMaster
{ 
 public int ID { get; set; }
 public string Name { get; set; }
 public int Age { get; set; }
 public string Menpai { get; set; }
 public string Kongfu { get; set; }
 public int Level { get; set; }
 public override string ToString()
 {
  return string.Format("id:{0},name:{1},age:{2},menpai:{3},kongfu:{4},level:{5}", this.ID, this.Name, this.Age, this.Menpai, this.Kongfu, this.Level);
 }
}

//武学
class Kongfu
{
 public int Id { get; set; }
 public string Name { get; set; }
 public int Power { get; set; }
 public Kongfu() { }
 public Kongfu(int id, string name, int power)
 {
  Id = id;
  Name = name;
  Power = power;
 }
 public override string ToString()
 {
  return string.Format("Id:{0},Name:{1},Power:{2}", this.Id, this.Name, this.Power);
 }
}

{
   var MasterList = new List<MatialArtsMaster>
   {
    new MatialArtsMaster(){ID=001,Name="黄蓉",Age=18,Menpai="丐帮",Kongfu="打狗棒法",Level=9},
    new MatialArtsMaster(){ID=002,Name="洪七公",Age=70,Menpai="丐帮",Kongfu="打狗棒法",Level=10},
    new MatialArtsMaster(){ID=003,Name="郭靖",Age=22,Menpai="丐帮",Kongfu="降龙十八掌",Level=10},
    new MatialArtsMaster(){ID=004,Name="任我行",Age=50,Menpai="明教",Kongfu="葵花宝典",Level=1},
    new MatialArtsMaster(){ID=005,Name="东方不败",Age=35,Menpai="明教",Kongfu="葵花宝典",Level=10},
    new MatialArtsMaster(){ID=006,Name="林平之",Age=23,Menpai="华山",Kongfu="葵花宝典",Level=7},
    new MatialArtsMaster(){ID=007,Name="岳不群",Age=50,Menpai="华山",Kongfu="岳不群",Level=8},
    new MatialArtsMaster(){ID=008,Name="令狐冲",Age=23,Menpai="华山",Kongfu="独孤九剑",Level=10},
    new MatialArtsMaster(){ID=009,Name="梅超风",Age=23,Menpai="梅花岛",Kongfu="九阴真经",Level=8},
   };
   var kungfuList = new List<Kongfu>()
   {
    new Kongfu(){Id=1,Name="打狗棒法",Power=90},
    new Kongfu(){Id=2,Name="降龙十八掌",Power=95},
    new Kongfu(){Id=3,Name="葵花宝典",Power=100},
    new Kongfu(){Id=4,Name="独孤九剑",Power=100},
    new Kongfu(){Id=5,Name="九阴真经",Power=100},
   };

var res = from master in MasterList
     where master.Kongfu == "葵花宝典"
     select master;
  foreach(var temp in res)
  {
   Console.WriteLine(temp.ToString());
  }
  //id: 4,name: 任我行,age: 50,menpai: 明教,kongfu: 葵花宝典,level: 1
  //id: 5,name: 东方不败,age: 35,menpai: 明教,kongfu: 葵花宝典,level: 10
  //id: 6,name: 林平之,age: 23,menpai: 华山,kongfu: 葵花宝典,level: 7

var res = from master in MasterList
     select master.Name;
  foreach(var temp in res)
  {
   Console.WriteLine(temp.ToString());
  }
  //黄蓉
  //洪七公
  //郭靖
  //任我行
  //东方不败
  //林平之
  //岳不群
  //令狐冲
  //梅超风

var res = MasterList.Where(master => master.Level > 8);
  foreach(var temp in res)
  {
   Console.WriteLine(temp.ToString());
  }
  //id: 1,name: 黄蓉,age: 18,menpai: 丐帮,kongfu: 打狗棒法,level: 9
  //id: 2,name: 洪七公,age: 70,menpai: 丐帮,kongfu: 打狗棒法,level: 10
  //id: 3,name: 郭靖,age: 22,menpai: 丐帮,kongfu: 降龙十八掌,level: 10
  //id: 5,name: 东方不败,age: 35,menpai: 明教,kongfu: 葵花宝典,level: 10
  //id: 8,name: 令狐冲,age: 23,menpai: 华山,kongfu: 独孤九剑,level: 10