Test CancellationToken

CancellationToken.cs

        static void Main()
        {
            var source = new CancellationTokenSource();
            var task1 = Task.Factory.StartNew(() =>
            {
                Console.WriteLine("run task1");
                Task.Delay(2000).Wait();
                Console.WriteLine("after delay task1");
                source.Token.ThrowIfCancellationRequested();
                Console.WriteLine("no exec task1");
            }, source.Token); // pass cancellation token or not

            var task2 = task1.ContinueWith(t =>
            {
                Console.WriteLine("run task2");
            }, TaskContinuationOptions.OnlyOnCanceled); // mark here as OnlyOnCanceled or NotOnCanceled

            Task.Delay(100).Wait();
            source.Cancel();

            try
            {
                task1.Wait();
            }
            catch (AggregateException e)
            {
                Console.WriteLine("Exception messages:");
                foreach (var ie in e.InnerExceptions)
                    Console.WriteLine("   {0}: {1}", ie.GetType().Name, ie.Message);

                Console.WriteLine("\nTask status: {0}", task1.Status);
            }

            Task.Delay(-1).Wait();
        }