C#计算程序运行时间的三种方法

static void TestDateTime()  
{  
    DateTime beforDT = System.DateTime.Now;    

    //消耗时间的代码片段  

    DateTime afterDT = System.DateTime.Now;  
    TimeSpan ts = afterDT.Subtract(beforDT);  
    Console.WriteLine("DateTime总共花费{0}ms.", ts.TotalMilliseconds);  
}  

``

static void TestStopwatch()
{  
Stopwatch sw = new Stopwatch();  
sw.Start();  
//消耗时间的代码片段    
sw.Stop();  
TimeSpan ts2 = sw.Elapsed;  
Console.WriteLine("Stopwatch总共花费{0}ms.", ts2.TotalMilliseconds); 
}   

``

[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 TestAPI()
{
    long count = 0;
    long count1 = 0;
    long freq = 0;
    double result = 0;
    QueryPerformanceFrequency(ref freq);
    QueryPerformanceCounter(ref count);   

    //消耗时间的代码片段  

    QueryPerformanceCounter(ref count1);
    count = count1 - count;
    result = (double)(count) / (double)freq;
    Console.WriteLine("QueryPerformanceCounter耗时: {0} 秒", result);
}

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