C# Contains, Exists, Any区别

性能对比 : Contains > Exists > Any

Contains, Exists, Any都可以实现判断元素是否存在。
Contains和Exists在System.Collections.Generic.List< T >下,
Any在System.Linq.Enumerable下

性能测试代码:

 public static void Test_Contains_Exists_Any(int num)
        {
            List list = new List();

            int N = num;
            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));
            sw.Stop();
            Console.WriteLine("Contains:" + sw.Elapsed.Milliseconds.ToString());

            sw.Start();
            Console.WriteLine(list.Exists(i => i == N));
            sw.Stop();
            Console.WriteLine("Exists:" + sw.Elapsed.Milliseconds.ToString());

            sw.Start();
            Console.WriteLine(list.Any(i => i == N));
            sw.Stop();
            Console.WriteLine("Any:" + sw.Elapsed.Milliseconds.ToString());
        }