C#计算一段程序运行时间的三种方法
第一种方法利用System.DateTime.Now：
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static void SubTest(){DateTime beforDT = System.DateTime.Now;//耗时巨大的代码DateTime afterDT = System.DateTime.Now;TimeSpan ts = afterDT.Subtract(beforDT);Console.WriteLine("DateTime总共花费{0}ms.", ts.TotalMilliseconds);} |
第二种用Stopwatch类(System.Diagnostics)：
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static void SubTest(){Stopwatch sw = new Stopwatch();sw.Start();//耗时巨大的代码sw.Stop();TimeSpan ts2 = sw.Elapsed;Console.WriteLine("Stopwatch总共花费{0}ms.", ts2.TotalMilliseconds);} |
第三种用API实现：
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[System.Runtime.InteropServices.DllImport("Kernel32.dll")]static extern bool QueryPerformanceCounter(ref long count);[System.Runtime.InteropServices.DllImport("Kernel32.dll")]static extern bool QueryPerformanceFrequency(ref long count);static void SubTest(){long count = 0;long count1 = 0;long freq = 0;double result = 0;QueryPerformanceFrequency(ref freq);QueryPerformanceCounter(ref count);//耗时巨大的代码QueryPerformanceCounter(ref count1);count = count1 - count;result = (double)(count) / (double)freq;Console.WriteLine("QueryPerformanceCounter耗时: {0} 秒", result);} |
