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
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
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
到此这篇关于详解C# List<T>的Contains,Exists,Any,Where性能对比的文章就介绍到这了,更多相关C# Contains,Exists,Any,Where内容请搜索自由互联以前的文章或继续浏览下面的相关文章希望大家以后多多支持自由互联!