输出函数调用时间 多少毫秒(转)

/// <summary>

/// 得到系统时钟周期的当前值

/// </summary>

/// <param name="lpPerformanceCount">输出参数，得到系统时钟周期的当前值</param>

/// <returns>返回是否获取成功</returns>

[DllImport("kernel32.dll", SetLastError = true)]

public static extern bool QueryPerformanceCounter(out long lpPerformanceCount);



/// <summary>

/// 得到系统的时钟频率，每秒的周期数

/// </summary>

/// <param name="frequency">输出参数，得到系统的每秒周期数</param>

/// <returns>返回是否获取成功</returns>

[DllImport("kernel32.dll", SetLastError = true)]

public static extern bool QueryPerformanceFrequency(out long frequency);

调用:

long start, end;    //时钟周期

long frequency;        //时钟频率

DateTimeEx.QueryPerformanceFrequency(out frequency);

DateTimeEx.QueryPerformanceCounter(out start);

CallFunction();

DateTimeEx.QueryPerformanceCounter(out end);

Console.WriteLine("CallFunction函数运行用时: " + ((end - start) * 1000 / frequency).ToString()); 

检测调用函数用了多长时间的