Question

I could use stopwatch to find execution time of a code

Example:

timer.Start();
for(int i=0; i<100; i++)
{
    ...
}
timer.Stop();
lTime.Text = timer.Elapsed.TotalMilliseconds.ToString();

But what if I call a function that use recursive?

timer.Start();
recur(a, b);
timer.Stop();
lTime.Text = timer.Elapsed.TotalMilliseconds.ToString();

Its show execution time 0.

Edit: This code running fine… I had one error in the recursive function…

Answer 1

The following works for me:

using System.Diagnostics;

namespace StackOverflow.Demos
{
    class Program
    {
        public static void Main(string[] args) 
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            recur(10000, new object());
            timer.Stop();
            Console.WriteLine( timer.Elapsed.TotalMilliseconds.ToString());
            Console.ReadKey();
        }
        private static void recur(int a, object b)
        {
            if (a > 0)
                recur(--a, b);
        }
    }
}