using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;

namespace ThrowPerf
{
    class Program
    {
        static void Main(string[] args)
        {
            var stp = new Stopwatch();
            stp.Start();

            for (var i = 0; i < 10000; i++)
            {
                try
                {
                    // base cost
                    // try
                    {
                        doTry();
                        goto failed;
                    }
                // catch
                failed:
                    {
                        doCleanup();
                    }
                }
                catch { }
            }

            stp.Stop();
            Console.WriteLine("Method call+goto: {0}", stp.Elapsed);
            stp.Reset();
            stp.Start();

            for (var i = 0; i < 10000; i++)
            {
                try
                {
                    // catch
                    try
                    {
                        doTryFail();
                    }
                    catch
                    {
                        doCleanup();
                    }
                }
                catch { }
            }

            stp.Stop();
            Console.WriteLine("Try/Catch: {0}", stp.Elapsed);
            stp.Reset();
            stp.Start();

            for (var i = 0; i < 10000; i++)
            {
                try
                {
                    bool suceeded = false;
                    // finally
                    try
                    {
                        doTryFail();
                        suceeded = true;
                    }
                    finally
                    {
                        if (!suceeded)
                            doCleanup();
                    }
                }
                catch { }
            }

            stp.Stop();
            Console.WriteLine("Try/Flag/Finally: {0}", stp.Elapsed);
            stp.Reset();
            stp.Start();
            Console.ReadLine();
        }

		// the purpose of checking datetime is just to ensure the call does 
		// not get optimized out.  Otherwise, it does not matter.
        private static void doTryFail()
        {
            if (System.DateTime.Now.Year == 0)
                Console.WriteLine("foobar");
            throw new NotImplementedException();
        }

        private static void doCleanup()
        {
            if (System.DateTime.Now.Year == 0)
                Console.WriteLine("foobar");
        }

        private static void doTry()
        {
            if (System.DateTime.Now.Year == 0)
                Console.WriteLine("foobar");
        }
    }
}