Wrapping StopWatch timing with a delegate or lambda?

Question

I'm writing code like this, doing a little quick and dirty timing:

var sw = new Stopwatch(); sw.Start(); for (int i = 0; i < 1000; i++) {     b = DoStuff(s); } sw.Stop(); Console.WriteLine(sw.ElapsedMilliseconds); 

Surely there's a way to call this bit of timing code as a fancy-schmancy .NET 3.0 lambda rather than (God forbid) cutting and pasting it a few times and replacing the DoStuff(s) with DoSomethingElse(s)?

I know it can be done as a Delegate but I'm wondering about the lambda way.

Answer 1

How about extending the Stopwatch class?

public static class StopwatchExtensions {     public static long Time(this Stopwatch sw, Action action, int iterations)     {         sw.Reset();         sw.Start();          for (int i = 0; i < iterations; i++)         {             action();         }         sw.Stop();          return sw.ElapsedMilliseconds;     } } 

Then call it like this:

var s = new Stopwatch(); Console.WriteLine(s.Time(() => DoStuff(), 1000)); 

You could add another overload which omits the "iterations" parameter and calls this version with some default value (like 1000).

Answer 2

Here's what I've been using:

public class DisposableStopwatch: IDisposable {     private readonly Stopwatch sw;     private readonly Action<TimeSpan> f;      public DisposableStopwatch(Action<TimeSpan> f) {         this.f = f;         sw = Stopwatch.StartNew();     }      public void Dispose() {         sw.Stop();         f(sw.Elapsed);     } } 

Usage:

using (new DisposableStopwatch(t => Console.WriteLine("{0} elapsed", t))) {   // do stuff that I want to measure }