Question

What I am trying to do is be able to pass a function reference to another function and have it used as a callback method for a System.Threading.ThreadPool.QueueUserWorkItem.

See in method D() the ‘Any’ parameter.

I need to be able to pass the callback method pointer or reference for the ‘Any’ parameter. I can’t use a delegate, because that would need to be static, is that correct?

Any ideas?

    private void A() { /*code*/ }

    private void B() { /*code*/ }

    private void C(int i)
    {
        switch(i)
        {
            case 1:
                D(A());
                break;
            case 2:
                D(B());
                break;
            default:
                break;
        }
    }

    private void D(type? Any)
    { 
        System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(Any));
    }

Answer 1

I think this will do what you want, but WaitCallback delegates take an object as a parameter.

        private void A(object state)
    {
        // does one thing
    }

    private void B(object state)
    {
        // does a different thing
    }

    private void C(int i)
    {
        switch (i)
        {
            case 1:
                D(new System.Threading.WaitCallback(A));
                break;
            case 2:
                D(new System.Threading.WaitCallback(B));
                break;
            default:
                break;
        }
    }

    private void D(System.Threading.WaitCallback worker)
    { 
        System.Threading.ThreadPool.QueueUserWorkItem(worker);
    }