1.用DateTime

long startTime = DateTime.Now.Ticks;

f();

long endTime = DateTime.Now.Ticks;

float lastTime = (float) (endTime - startTime) / 10000;  //转化为毫秒
Console.Write("程序花费的毫秒数：");
Console.WriteLine(lastTime);

2.用Stopwatch类

using System.Diagnostics;//引用相关的命名空间


Stopwatch st = new Stopwatch();//实例化类
st.Start();//开始计时

f();//调用某函数

st.Stop();//终止计时
Console.Write("程序花费的毫秒数：");
Console.WriteLine(st.ElapsedMilliseconds.ToString());