public class PerformanceTester
{
    public TimeSpan TotalTime { get; private set; }
    public TimeSpan AverageTime { get; private set; }
    public TimeSpan MinTime { get; private set; }
    public TimeSpan MaxTime { get; private set; }
    public Action Action { get; set; }

    public PerformanceTester(Action action)
    {
        Action = action;
        MaxTime = TimeSpan.MinValue;
        MinTime = TimeSpan.MaxValue;
    }

    public void MeasureExecTime()
    {
        var sw = Stopwatch.StartNew();
        Action();
        sw.Stop();
        AverageTime = sw.Elapsed;
        TotalTime = sw.Elapsed;
    }

    public void MeasureExecTime(int iterations)
    {
        Action(); // warm up
        var sw = Stopwatch.StartNew();
        for (int i = 0; i < iterations; i++)
        {
            Action();
        }
        sw.Stop();
        AverageTime = new TimeSpan(sw.Elapsed.Ticks/iterations);
        TotalTime = sw.Elapsed;
    }

    public void MeasureExecTimeWithMetrics(int iterations)
    {
        TimeSpan total = new TimeSpan(0);

        Action(); // warm up
        for (int i = 0; i < iterations; i++)
        {
            var sw = Stopwatch.StartNew();

            Action();

            sw.Stop();
            TimeSpan thisIteration = sw.Elapsed;
            total += thisIteration;

            if (thisIteration > MaxTime) MaxTime = thisIteration;
            if (thisIteration < MinTime) MinTime = thisIteration;
        }

        TotalTime = total;
        AverageTime = new TimeSpan(total.Ticks/iterations);
    }
}