.NET Using Stopwatch class to measure execution time for code

By Indranil Chatterjee

StopWatch provides a convinient way to measure the time of executon of a code segment. This FAQ explains some simple usages of that class.

There are times when we need to measure the time (duration) of execution of a code segment or a method, especially when we are writing multithreaded apps. Traditionally, developers have resorted to the following pattern:

var startTime = DateTime.Now;
//Execute the code fragment
var endTime = DateTime.Now; //Then they calculate the difference between start and end times.

With the Stopwatch class, this is much easier and it requires lesser code and variables to manage.

//Start a stopwatch:
var watch = Stopwatch.StartNew(); //This code initializs a new Stopwatch, sets its elapsed time property to zero and starts measuring elapsed time.
//Execute the code
watch.Stop(); //This stops the watch
The elapsed time can be measured by using Elapsed, ElapsedMilliSeconds and ElapsedTicks properties.
A call to watch.Reset() stops time interval measurement and resets elapsed time to zero.
watch.ReStart() is similar to Reset() except that it also starts a fresh recording of elapsed time.

This is a method that can be used to profile/record the execution time of any method:

private long RecordTime(Action method)
var timer = Stopwatch.StartNew();

return timer.ElapsedMilliseconds;

This takes in an Action delegate (so that one can pass any method call wrapped in a delegate) and it executes the passed delegate to record ite elapsed execution time and returns the elapsed time in milliseconds.

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