プログラムロジックの実行時間をどのように計算しますか?

 1 class Program

 2     {

 3 

 4         [System.Runtime.InteropServices.DllImport("Kernel32.dll")]

 5         static extern bool QueryPerformanceCounter(ref long count);

 6         [System.Runtime.InteropServices.DllImport("Kernel32.dll")]

 7         static extern bool QueryPerformanceFrequency(ref long count);

 8         [STAThread]

 9         static void Main(string[] args)

10         {

11             Console.WriteLine(" \r
");

12             long count = 0;

13             long count1 = 0;

14             long freq = 0;

15             double result = 0;

16 

17             QueryPerformanceFrequency(ref freq);

18             QueryPerformanceCounter(ref count);

19 

20             #region  

21             int times = 20;

22             int value = 1;

23             string filePath = "D://123.txt";

24 

25             do

26             {

27                 if (!File.Exists(filePath))

28                 {

29                     var file = File.Create(filePath);

30                     file.Close();

31                     File.WriteAllText(filePath, "1");

32                 }

33                 else

34                 {

35                     value = Convert.ToInt32(File.ReadAllText(filePath));

36                     value++;

37                     File.WriteAllText(filePath, value.ToString());

38                     times--;

39                 }

40                 Console.WriteLine(value);

41             } while (times > 0); 

42             #endregion

43 

44             QueryPerformanceCounter(ref count1);

45             count = count1 - count;

46             result = (double)(count) / (double)freq;

47             Console.WriteLine(" ， : {0}  ", result);

48             Console.ReadLine();

49         }