ReflectionTest.cs

using System;
using System.Collections.Generic;
using System.Reflection;

namespace ReflectionTest
{
    public abstract class SomeBehaviour
    {
        internal MethodInfo startMethod = null;
        internal MethodInfo updateMethod = null;
    }

    public class SomeScript : SomeBehaviour
    {
        private void Start()
        {
            Console.WriteLine("SomeScript.Start");
        }
    }

    public class AnotherScript : SomeBehaviour
    {
        private void Start()
        {
            Console.WriteLine("AnotherScript.Start");
        }

        private void Update()
        {
            Console.WriteLine("AnotherScript.Update");
        }
    }

    internal class Program
    {
        private static List<SomeBehaviour> objects = new List<SomeBehaviour>();

        public static SomeBehaviour CreateObject(string typeName)
        {
            SomeBehaviour ret = null;
            try
            {
                Type type = Type.GetType("ReflectionTest." + typeName);
                if (type != null)
                {
                    if (type.IsSubclassOf(typeof(SomeBehaviour)))
                    {
                        ret = (SomeBehaviour)(Activator.CreateInstance(type));
                        try
                        {
                            ret.startMethod = type.GetMethod("Start", BindingFlags.NonPublic | BindingFlags.Instance);
                        }
                        catch (Exception e)
                        {
                            Console.Error.WriteLine(e);
                        }
                        try
                        {
                            ret.updateMethod = type.GetMethod("Update", BindingFlags.NonPublic | BindingFlags.Instance);
                        }
                        catch (Exception e)
                        {
                            Console.Error.WriteLine(e);
                        }
                        objects.Add(ret);
                    }
                }
            }
            catch (Exception e)
            {
                Console.Error.WriteLine(e);
            }
            return ret;
        }

        public static void Run()
        {
            foreach (SomeBehaviour obj in objects)
            {
                if (obj.startMethod != null)
                    obj.startMethod.Invoke(obj, new object[0]);
            }
            while (true)
            {
                foreach (SomeBehaviour obj in objects)
                {
                    if (obj.updateMethod != null)
                        obj.updateMethod.Invoke(obj, new object[0]);
                }
            }
        }

        static void Main(string[] args)
        {
            CreateObject("BlahScript");
            CreateObject("SomeScript");
            CreateObject("AnotherScript");
            Run();
        }
    }
}