问如何在已经运行的线程上执行函数？

EN

using System;
using System.Threading;

namespace FiringTheTimerTestHarness
{
    class Program
    {
        public static Thread _worker;
        public static Timer _timer;
        static void Main(string[] args)
        {
            _worker = new Thread(new ThreadStart(ThreadWorker));
            _worker.Start();
            var startTime = DateTime.Now;
            // Simulate the main UI thread being active doing stuff (i.e. if there's a Windows Forms app so we don't need anything to 
            // keep the app "alive"
            while (1==1)
            {
                Thread.Sleep(100);
                if (startTime.AddSeconds(30) < DateTime.Now)
                {
                    // Lets pretend that we need to fire the timer *now* so that we can get the result *now*
                    _timer.Change(0, 5000);
                }
            }
        }

        public static void ThreadWorker()
        {
            _timer = new Timer(new TimerCallback(DoStuffEveryFiveSeconds), null, 5000, 5000);
            while (1 == 1)
            {
                Thread.Sleep(100);
            }
        }

        public static void DoStuffEveryFiveSeconds(object state)
        {
            Console.WriteLine("{0}: Doing stuff", DateTime.Now);
        }
    }
}

class FunctionXCaller
{
    private Task mTask;
    private BlockingCollection<TaskCompletionSource<TResult>> queue = new BlockingCollection<TaskCompletionSource<TResult>>();

    public FunctionXCaller()
    {
         mTask = Task.Run( () => WorkerMethod );
    }

    private void WorkerMethod()
    {
         while( !queue.IsCompleted )
         {
              TaskCompletionSource<TResult> tcs = queue.take();
              tcs.TrySetResult(FunctionX());
         }
    }


    public Task<TResult> CallXAsync()
    {
         TaskCompletionSource<TResult> tcs = new TaskCompletionSource<TResult>();
         queue.Add(tcs);
         return tcs.Task;
    }
}