How to use ThreadPool.QueueUserWorkItem with non-static methods?

Question

When I try to compile it gives me

Error 1 An object reference is required for the non-static field, method, or property 'ConsoleApplication1.Program.print(string)' ConsoleApplication1\ConsoleApplication1\Program.cs 15 47 ConsoleApplication1

So, I marked print as static and it works. But in a bigger program I have non-static methods. So how do I use ThreadPool with those methods?

class Program
{
    static void Main(string[] args)
    {
        ThreadPool.QueueUserWorkItem(o => print("hello"));
        Console.ReadLine();
    }

    public void print(string s)
    {
        Console.WriteLine(s);
    }
}

Fredrik Mörk · Accepted Answer · 2011-04-26 05:59:04Z

4

You just need an instance to operate on:

var myObject = new WhateverClassItIs();
ThreadPool.QueueUserWorkitem(o => myObject.SomeMethod("some input"));

Keep in mind that if the type that you use implements IDisposable (or some other cleanup mechanism), you should not invoke Dispose until you are certain that the asynchronous operation is completed (or at the end of the asynchronous operation itself).

answered Apr 26, 2011 at 5:59

Fredrik Mörk

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Kevin Hsu · Accepted Answer · 2011-04-26 06:00:47Z

2

In order to call a non-static, you need an instance. For example, in your program, this would make it work:

class Program
{
   static void Main(string[] args)    
   {
       Program p = new Program();
       ThreadPool.QueueUserWorkItem(o => p.print("hello"));
       Console.ReadLine();
   }

   public void print(string s)
   {
      Console.WriteLine(s);    
   }
}

answered Apr 26, 2011 at 6:00

Kevin Hsu

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