List中对比Contains, Exists, Any之间的比较

在List中，存在三种方法:Contains, Exists, Any。都可以实现查找元素。下面来做个测试，看下他们之间的性能比较如何。

测试代码如下：

List list = new List();

int N=1000000;
            for (int i = 0; i < N; i++)
            {
                list.Add(i);
            }
            System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
            sw.Start();
            //Console.WriteLine(list.Contains(N));
           // Console.WriteLine(list.Any(i => i == N));
            //Console.WriteLine(list.Exists(i => i == N));
            sw.Stop();
            Console.WriteLine(sw.Elapsed.ToString());

N=1000000	N=10000000	N=100000000
Contains	0.0042733(s)	0.0294047(s)	0.3624644(s)
Exists	0.0059634(s)	0.0420811(s)	0.4055032(s)
Any	0.0128684(s)	0.1084404(s)	1.1051506(s)

根据上表结果显示，性能从高到低的次序如下：

Contains>Exists>Any