using System;

using System.Reflection;

using System.Reflection.Emit;

using System.Threading;

​

namespace InlineIL

{

    class Program

    {

        static void Main(string[] args)

        {

            // Use inline IL to access the thread pool

            DynamicMethod threadMethod = new DynamicMethod("MyThreadMethod", typeof(void), new Type[] { typeof(int) });

            ILGenerator threadILGenerator = threadMethod.GetILGenerator();

            threadILGenerator.Emit(OpCodes.Ldarg_0);

            threadILGenerator.Emit(OpCodes.Ldftn, typeof(Program).GetMethod("WaitCallback", BindingFlags.NonPublic | BindingFlags.Static));

            threadILGenerator.Emit(OpCodes.Newobj, typeof(WaitCallback).GetConstructor(new Type[] { typeof(object), typeof(IntPtr) }));

            threadILGenerator.Emit(OpCodes.Call, typeof(ThreadPool).GetMethod("QueueUserWorkItem", new Type[] { typeof(WaitCallback) }));

            threadILGenerator.Emit(OpCodes.Ret);

​

            // Invoke the dynamic method to queue a new work item on the thread pool

            threadMethod.Invoke(null, new object[] { 5 });

        }

​

        // This is the WaitCallback method that will be called by the thread pool

        private static void WaitCallback(object state)

        {

            Console.WriteLine("Hello from the thread pool! State = {0}", state);

        }

    }

}

​