for的效率测试和结果，分享一下

int tnum = 100000; // 添加或查找的次数

int outnum = 10; // 外层循环次数



List<string> arr = new List<string>();

for(int i=0;i<tnum;i++)

    arr.Add(i.ToString());

string[] arr2 = new string[tnum];



for(int j=0;j<outnum;j++)

{

    Stopwatch watch = new Stopwatch();

    string msg;



    msg = "Number ";

    watch.Reset();

    watch.Start();

    for (int i = 0, h = arr.Count; i < h; i++)

    {

    }

    watch.Stop();

    Console.WriteLine(msg + "耗时:" + watch.ElapsedTicks.ToString());



    msg = ".Count ";

    watch.Reset();

    watch.Start();

    for (int i = 0; i < arr.Count; i++)

    {

    }

    watch.Stop();

    Console.WriteLine(msg + "耗时:" + watch.ElapsedTicks.ToString());



    msg = "Length ";

    watch.Reset();

    watch.Start();

    for (int i = 0; i < arr2.Length; i++)

    {

    }

    watch.Stop();

    Console.WriteLine(msg + "耗时:" + watch.ElapsedTicks.ToString());

}