C# uses stopwatch to check program running time

If you are worried that some code is very time-consuming, you can use StopWatch to check the time consumed by this code, as shown in the code below

System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
timer.Start();
Decimal total = 0;
int limit = 1000000;
for (int i = 0; i < limit; ++i)
{
  total = total + (Decimal)Math.Sqrt(i);
}
timer.Stop();
Console.WriteLine(“Sum of sqrts: {0}”,total);
Console.WriteLine(“Elapsed milliseconds: {0}”,
timer.ElapsedMilliseconds);
Console.WriteLine(“Elapsed time: {0}”, timer.Elapsed);

There are now special tools to detect the running time of the program, which can be refined down to each step. A method, such as dotNetPerformance software.

Taking the above code as an example, you need to modify the source code directly, which is a bit inconvenient if it is used to test the program. Please refer to the example below.

class AutoStopwatch : System.Diagnostics.Stopwatch, IDisposable
{
   public AutoStopwatch()
   { 
     Start();
   }
   public void Dispose()
   {
     Stop();
     Console.WriteLine(“Elapsed: {0}”, this.Elapsed);
   }
}

With the help of using syntax, as shown in the code below, you can check the running time of a piece of code and print it on the console.

using (new AutoStopwatch())
{
  Decimal total2 = 0;
  int limit2 = 1000000;
  for (int i = 0; i < limit2; ++i)
  {
     total2 = total2 + (Decimal)Math.Sqrt(i);
  }
}