using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        private static Exception _exceptions;
        private static int _result;

        static void Main(string[] args)
        {
            if (Enter())
            {
                Func<int> _func = () =>
                {
                    return 5;
                };

                CancellationTokenSource cts = new CancellationTokenSource();
                cts.Cancel();
                Task.Run(_func, cts.Token)
                    .ContinueWith((antecedent) =>
                    {
                        try
                        {
                            antecedent.Wait(cts.Token);
                            Interlocked.Exchange(ref _result, antecedent.Result);
                        }
                        catch (AggregateException e)
                        {
                            Interlocked.Exchange(ref _exceptions, e);
                        }
                        catch (OperationCanceledException)
                        {
                            ResetState();
                        }
                        catch (Exception e)
                        {
                            Interlocked.Exchange(ref _exceptions, new AggregateException(e));
                        }
                        finally
                        {
                            Exit();
                        }
                    });
            }
        }

        private static void Exit()
        {
            Console.WriteLine("Hit finally");
        }

        private static void ResetState()
        {
            return;
        }

        private static bool Enter()
        {
            return true;
        }
    }
}