Why i can't start thread in thread pool?

Question

I just created function of thread:

static void ThreadMethod {}

And try this:

ThreadPool.QueueUserWorkItem(ThreadMethod);

But QueueUserWorkItem requests WaitCallback object.

It's just example from my book and looks like it must work this way. What am i missing?

Answer 1

I think it's a typo

Not :

static void ThreadMethod {}

But :

static void ThreadMethod(object sender) {//Method stuff go here}

And call it as,

ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadMethod));

A working minimal case + parameter passing to thread

using System;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            paras myvalues = new paras();

            myvalues.para1 = 10;
            myvalues.para2 = 20;

            ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadMethod),myvalues);


            Console.ReadKey();
        }

        static void ThreadMethod(object state)
        {
            paras vals =(paras) state;

            Console.WriteLine(vals.para1);
            Console.WriteLine(vals.para2);

        }

    }

    struct paras
    {
        int Para1;

        public int para1
        {
            get { return Para1; }
            set { Para1 = value; }
        }

        int Para2;

        public int para2
        {
            get { return Para2; }
            set { Para2 = value; }
        }
    }
}