测试

新建一个Person类

public class Person { public Person(string name,int id) { Name = name; Id = id; } public string Name { get; set; } public int Id { get; set; } }

初始化List中有一百万条数据，然后分别通过每种方法判断xiaoming是否在List中，代码如下

static void Main(string[] args) { List<Person> persons = new List<Person>(); //初始化persons数据 for (int i = 0; i < 1000000; i++) { Person person = new Person("My" + i,i); persons.Add(person); } Person xiaoming=new Person("My999999", 999999); //下面通过三种方法判断persons中是否包含xiaoming Stopwatch watch = new Stopwatch(); watch.Start(); bool a = persons.Contains(xiaoming); watch.Stop(); Stopwatch watch1 = new Stopwatch(); watch1.Start(); bool b = persons.Exists(x=>x.Id==xiaoming.Id); watch1.Stop(); Stopwatch watch2 = new Stopwatch(); watch2.Start(); bool c = persons.Where(x=>x.Id==xiaoming.Id).Any(); watch2.Stop(); Stopwatch watch3 = new Stopwatch(); watch3.Start(); bool d = persons.Any(x => x.Id == xiaoming.Id); watch3.Stop(); Console.WriteLine("Contains耗时：" + watch.Elapsed.TotalMilliseconds); Console.WriteLine("Exists耗时：" + watch1.Elapsed.TotalMilliseconds); Console.WriteLine("Where耗时：" + watch2.Elapsed.TotalMilliseconds); Console.WriteLine("Any耗时：" + watch3.Elapsed.TotalMilliseconds); Console.ReadLine(); }

执行结果如下图所示

结论

通过上图可以看出性能排序为

Contains > Exists > Where > Any

注意：
Contains中不能带查询条件

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