how to measure execution time in specific part of View

Question

I want to calculate execution time in a specific part of View in MVC asp.net for example

<p>start time is A</p>

<br />

@for (int i = 0; i < 1000000; i++)
{

        if (@i % 100000 == 0)
        {
         <p>@i</p> <br />  
        }

}
 <p>End time is B</p>
<p>execution time is: C</p>

how to calculate A, B, C in above code ?

score 2 · Answer 1 · edited Jul 08 '17 at 04:21

What I would recommend you to do here is to create an instance of Stopwatch by Stopwatch.StartNew, execute your method or your code that you want to calculate execution time. Stop the Stopwatch where you think you method should be done with execution, and then get ElapsedMilliseconds like I will do in code below:

@{
  Stopwatch stopwatch = Stopwatch.StartNew();
  for (int i = 0; i < 1000000; i++)
  {
    if (i % 100000 == 0)
        {
             @Html.Raw("<p>" + i.ToString() + "</p> <br />");  
        }

    }
   stopwatch.Stop();
   @Html.Raw("<p>Elapsed time is: " + stopwatch.ElapsedMilliseconds.ToString() + "</p>");
}

And please, in case you might get an Error while you are trying to execute this code, be sure that you've included System.Diagnostics;

P.S If you don't like stopwatch.ElapsedMilliseconds you might check also for stopwatch.Elapsed to display elapsed time..

As I can see after Alexander's comment that you want start time, end time etc, what I suggest you to do here is to create a custom Stopwatch by inheriting System.Diagnostics.Stopwatchclass and extending it with a couple of DateTime properties.

And I will now show you how you might do it:

public class MyCustomStopWatch : Stopwatch
{

        public DateTime? StartAt { get; private set; }
        public DateTime? EndAt { get; private set; }

        public void Reset()
        {
            StartAt = null;
            EndAt = null;

            base.Reset();
        }

        public void Restart()
        {
            StartAt = DateTime.Now;
            EndAt = null;

            base.Restart();
        }

        //This is what is important to you right now, to get data about that when you code started, and when your code finished with executing
        public void Start()
        {
            StartAt = DateTime.Now;

            base.Start();
        }

        public void Stop()
        {
            EndAt = DateTime.Now;

            base.Stop();
        }


 }

If you are wondering HOW COULD I USE THAT CODE?

DON'T WORRY, HERE IS AN EXAMPLE BASED ON YOUR QUESTION:

@{
      MyCustomStopwatch stopwatch = MyCustomStopwatch();
      for (int i = 0; i < 1000000; i++)
      {
        if (i % 100000 == 0)
            {
                 @Html.Raw("<p>" + i.ToString() + "</p> <br />");  
            }

        }
       stopwatch.Stop();
       @Html.Raw(String.Format("<p>Stopwatch elapsed: {0}, StartAt: {1}, EndAt: {2} </p>", stopwatch.ElapsedMilliseconds.ToString(), stopwatch.StartAt.Value.ToString(), stopwatch.EndAt.Value.ToString());
    }

Whatever I hope that you catch up the point and I hope that this helped you to solve your problem

@AlexanderHiggins how could I know that? Where is that written, do I look a like a seer :) :) The only thing I can see in his question is a execution/elapsed time.. maybe I missed that somewhere but I really can't see where .. — Roxy'Pro, Jul 08 '17 at 00:26
The question asks to calculate and by inference print out A, B, and C. Your code is calculating and printing out B only. — Alexander Higgins, Jul 08 '17 at 00:30
@DevX If it seems to be a good and helpful answer please accept so other user might recognize it as a good answer. — Roxy'Pro, Jul 08 '17 at 08:07

Alexander Higgins · Accepted Answer · 2017-07-08T00:17:18.600

1

You can do it like this:

@{
    DateTime StartTime = DateTime.Now;
    System.Diagnostics.StopWatch Watch = new System.Diagnostics.StopWatch();
    @Html.Raw("<p>start time is: " + StartTime.ToString() + "</p>");
    Watch.Start();
    for (int i = 0; i < 1000000; i++)
        {

        if (i % 100000 == 0)
        {
             @Html.Raw("<p>" + i.ToString() + "i</p> <br />");  
        }

    }
    Watch.Stop();
    DateTime EndTime = DateTime.Now;
    @Html.Raw("<p>End time is " + EndTime.ToString() + "</p>");
    @Html.Raw("<p>Execution time is: " + Watch.Elapsed.ToString() + "</p>");
}

Normally, I would recommend using a StopWatch to track the elapsed time but since you want the start and end times you might as well captured two dates and display the difference to calculate the time span.

edited Jul 08 '17 at 00:17

answered Jul 07 '17 at 23:32

Alexander Higgins

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1

Keep in mind that the resolution of `DateTime` is not that high. – jAC Jul 07 '17 at 23:34
Wait is not compiling or are you not seeing it on the screen? Also, let me fix the @ statements you have in your loop. – Alexander Higgins Jul 07 '17 at 23:58
Html.Raw is not executed in this code, I don't know why, also TimeSpan gives error of an object reference is required for the non-static field, method, or property – Dev X Jul 08 '17 at 00:16
Sorry that should have read `ElapsedToString` also Html.Raw needs @ before it. – Alexander Higgins Jul 08 '17 at 00:18

how to measure execution time in specific part of View

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