A New Way to Approach APM in .NET

using System;
using System.Windows.Forms;

namespace ApmHelperWinformsExample
{
    /// <summary>
    /// example if you have more parms than Func<> allows
    /// </summary>
    public partial class ApmHelperExample2 : Form
    {

        private readonly ApmHelper<Parms, double> _helper;
        public ApmHelperExample2()
        {
            
            InitializeComponent();
            this._helper = new ApmHelper<Parms, double>(Go);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var parms = new Parms {a = 1, b = 2, c = 3, d = 4};
            this._helper.InvokeAsync(parms, this.Callback);

        }

        private void Callback(double d)
        {
            
        }

        private static double Go(Parms parms)
        {
            return SomeWebServiceMaybe.SomeLongRunningAddFunction(parms.a, parms.b, parms.c, parms.d);
        }

        private class Parms
        {
            public int a, b, c, d;
        }
    }
}