handman-parallel-for.cs

    public class Program
    {
        public static void Main(string[] args)
        {
            For(0, 10, (i) => {
                Console.WriteLine(i);
            });

            //Parallel.For(0, 10, (i) => {
            //    Console.WriteLine(i);
            //});
            Console.WriteLine("Finished...");
            Console.ReadLine();
        }

        public static Task For(int from, int to, Action<int> action)
        {
            List<Task> tasks = new List<Task>();
            for (int i = from; i < to; i++)
            {
                tasks.Add(Task.Factory.StartNew(o =>
                {
                    int number = (int)o;
                    action(number);
                }, i));
            }

            return Task.WhenAll(tasks.ToArray());
        }
    }