第一種方法利用System.DateTime.Now：

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static?void?SubTest() { DateTime beforDT = System.DateTime.Now; //耗時巨大的代碼 DateTime afterDT = System.DateTime.Now; TimeSpan ts = afterDT.Subtract(beforDT); Console.WriteLine("DateTime總共花費{0}ms.", ts.TotalMilliseconds); }

第二種用Stopwatch類(System.Diagnostics)：

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static?void?SubTest() { Stopwatch sw =?new?Stopwatch(); sw.Start(); //耗時巨大的代碼 sw.Stop(); TimeSpan ts2 = sw.Elapsed; Console.WriteLine("Stopwatch總共花費{0}ms.", ts2.TotalMilliseconds); }

第三種用API實現：

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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); //耗時巨大的代碼 QueryPerformanceCounter(ref?count1); count = count1 - count; result = (double)(count) / (double)freq; Console.WriteLine("QueryPerformanceCounter耗時: {0} 秒", result); }

總結

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