DelegatePerformanceComparision.cs

namespace Delegate_Perf_Test
{
    [TestFixture]
    public class Delegate_Performance_Comparision
    {
        [Test]
        public void MeasureDelegate()
        {
            int n = 50000000;
            Action<int> d = MethodNoInlining;
            var stopwatch = Stopwatch.StartNew();
            for (int i = 0; i < n; ++i)
            {
                d(i);
            }
            stopwatch.Stop();
            Console.WriteLine("Delegate Call: " + stopwatch.Elapsed);

            stopwatch = Stopwatch.StartNew();
            for (int i = 0; i < n; ++i)
            {

                MethodNoInlining(i);
            }
            stopwatch.Stop();
            Console.WriteLine("Direct Call Not Inlined: " + stopwatch.Elapsed);

            stopwatch = Stopwatch.StartNew();
            for (int i = 0; i < n; ++i)
            {

                MethodWithInlining(i);
            }
            stopwatch.Stop();
            Console.WriteLine("Direct Call Inlined: " + stopwatch.Elapsed);
        }

        [MethodImpl(MethodImplOptions.NoInlining)]
        private void MethodNoInlining(int x)
        {
            x = x + 1;
        }

        private void MethodWithInlining(int x)
        {
            x = x + 1;
        }
    }
}