Linq扩展函数有哪些

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首先介绍Linq扩展函数（泛型函数）的方式提供的函数：
◆用不同方式产生结果集： Reverse<>(), ToArray<>(), ToList<>()
◆集合操作： Distinct<>(), Union<>(), Intersect<>()
◆统计函数： Count<>(), Sum<>(), Min<>(), Max<>()

Linq扩展函数Enumerable获取Counts

为了使用这些Enumerable扩展函数，一般把LINQ查询表达式用括号括起来，先转换为IEnumerable兼容的对象。

static void GetCount()  {  string[] currentVideoGames = {"Morrowind", "BioShock",  "Half Life 2: Episode 1", "The Darkness",  "Daxter", "System Shock 2"};  // Get count from the query.  int numb = (from g in currentVideoGames  where g.Length > 6  orderby g  select g).Count();  // numb is the value 5.  Console.WriteLine("{0} items honor the LINQ query.", numb);  }

定义演示的实例

class Car  {  public string PetName = string.Empty;  public string Color = string.Empty;  public int Speed;  public string Make = string.Empty;  public override string ToString()  {  return string.Format("Make={0}, Color={1}, Speed={2}, PetName={3}",  Make, Color, Speed, PetName);  }  }

static void Main(string[] args)  {  Console.WriteLine("***** Fun with Query Expressions *****"n");  // This array will be the basis of our testing  Car[] myCars = new [] {  new Car{ PetName = "Henry", Color = "Silver", Speed = 100, Make = "BMW"},  new Car{ PetName = "Daisy", Color = "Tan", Speed = 90, Make = "BMW"},  new Car{ PetName = "Mary", Color = "Black", Speed = 55, Make = "VW"},  new Car{ PetName = "Clunker", Color = "Rust", Speed = 5, Make = "Yugo"},   new Car{ PetName = "Hank", Color = "Tan", Speed = 0, Make = "Ford"},  new Car{ PetName = "Sven", Color = "White", Speed = 90, Make = "Ford"},  new Car{ PetName = "Mary", Color = "Black", Speed = 55, Make = "VW"},  new Car{ PetName = "Zippy", Color = "Yellow", Speed = 55, Make = "VW"},  new Car{ PetName = "Melvin", Color = "White", Speed = 43, Make = "Ford"}  };  // We will call various methods here!  Console.ReadLine();  }

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