A simple and lean profiler that measures a code section using the IDisposable pattern.

Profiler.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.CompilerServices;

namespace MFractor.Utilities
{
    public class Profiler : IDisposable
    {
        readonly string Message;
        private Action<string, TimeSpan> DoneHandler;
        Stopwatch Watch;

        public Profiler(string message, Action<string, TimeSpan> onDone = null)
        {
            Message = message;
#if !RELEASE
            DoneHandler = onDone ?? new Action<string, TimeSpan>((content, time) =>
            {
                var elapsed = Math.Round(time.TotalMilliseconds, 2);
                Console.WriteLine($"{content} took {elapsed}ms");
            });
#endif

            Watch = Stopwatch.StartNew();
        }

        public void Dispose()
        {
            DoneHandler?.Invoke(Message, Watch.Elapsed);

            Watch = null;
            DoneHandler = null;
        }

        public static Profiler Profile([CallerMemberName] string context = "", [CallerFilePath] string file = "")
        {
            var fileName = Path.GetFileName(file);

            var profileContext = fileName + "|" + context;

            return new Profiler(profileContext);
        }
    }
}

// Usage
public void MyMethod()
{
  // Outputs "MyFile.cs | MyMethod took 20.45ms"
  using (var p  = Profiler.Profiler())
  {
    // Expensive code here
  }
}