//https://stackoverflow.com/questions/1314155/returning-a-value-from-thread

using System;

using System.Threading;

using System.Collections.Generic;

​

public class Program

{

    private const int COUNT = 15;

    private static List<Anything> m_list;

    // A delegate makes life simpler

    public delegate void MainDelegate(Anything sender, bool original);

    public static void Main()

    {

        m_list = new List<Anything>(COUNT);

        var obj = new AnyTask();

        obj.OnUpdate += new MainDelegate(ThreadMessages);

        obj.Test_Function(COUNT);

        Console.WriteLine();

        foreach (var item in m_list)

        {

            Console.WriteLine("[Complete]:" + item.Text);

        }

​

        Console.WriteLine("Press any key to exit.");

        //Console.ReadKey();

    }

​

    private static void ThreadMessages(Anything item, bool original)

    {

        if (original)

        {

            Console.WriteLine("[main method]:" + item.Text);

        }

        else

        {

            m_list.Add(item);

        }

    }

public class Anything

{

    public int Number {get; set;}

    public string Text {get; set;}

}

    public class AnyTask

    {

        private object m_lock;

        public AnyTask()

        {

            m_lock = new object ();

        }

​

        // Something to use the delegate

        public event MainDelegate OnUpdate;

        public void Test_Function(int count)

        {

            var list = new List<Thread>(count);

            for (var i = 0; i < count; i++)

            {

                var thread = new Thread(new ParameterizedThreadStart(Thread_Task));

                var item = new Anything()

                {

                Number = i, 

                    Text = String.Format("Test_Function #{0}", i)

                };

                thread.Start(item);

                list.Add(thread);

            }

​

            foreach (var thread in list)

            {

                thread.Join();

            }

        }

​

        private void MainUpdate(Anything item, bool original)

        {

            if (OnUpdate != null)

            {

                OnUpdate(item, original);

            }

        }

​

        private void Thread_Task(object parameter)

        {

            lock (m_lock)

            {

                var item = (Anything)parameter;

                MainUpdate(item, true);

                item.Text = String.Format("{0}; Thread_Task #{1}", item.Text, item.Number);

                item.Number = 0;

                MainUpdate(item, false);

            }

        }

    }

}