MinimalDispatcher.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace MinimalDispatcher
{

    public interface IHandle<TRequest, TResponse> {
        Task<TResponse> Handle(TRequest request);
    }


    public interface DispatcherMiddleware {
        void PreHook(object request) {
        }

        void PostHook(object request) {
        }
    }

    public class Dispatcher
    {
        private readonly Func<Type, object> getService;
        private readonly Func<Type, IEnumerable<object>> getServices;

        public Dispatcher(Func<Type, object> getService, Func<Type, IEnumerable<object>> getServices)
        {
            this.getService = getService;
            this.getServices = getServices;
        }

        public async Task<TResponse> Handle<TRequest, TResponse>(TRequest request)
        {
            var middlewares = getServices(typeof(DispatcherMiddleware)).Select(m => m as DispatcherMiddleware).ToList();
            middlewares.ForEach(m => m.PreHook(request));

            var handler = getService(typeof(IHandle<TRequest, TResponse>)) as IHandle<TRequest, TResponse>;
            var response = await handler.Handle(request);
            middlewares.ForEach(m => m.PreHook(request));
            return response;
        }
    }
}

Program.cs

namespace dispatch
{
    public class MyType {
        public string Wat => "Yolo";
        public override string ToString()
        {
            return "Wat: Yolo";
        }
    }
    public class MyTypeHandler : IHandle<MyType, string>
    {
        private readonly ILogger _logger;

        public MyTypeHandler(ILogger<MyTypeHandler> logger){
            _logger = logger;
        }

        public Task<string> Handle(MyType request)
        {
            _logger.LogInformation("Handling stuff");
            return Task.FromResult("Hello world");
        }
    }
    public class MyMiddleWare : DispatcherMiddleware {

        public async void PreHook(object request) {
            Console.WriteLine("Pre hook: " + request);
            await Task.CompletedTask;
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureLogging(logging =>
                    {
                        logging.ClearProviders();
                        logging.AddConsole();
                    })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}

Startup.cs

using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using MinimalDispatcher;

namespace dispatch
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddTransient<IHandle<MyType, string>, MyTypeHandler>();
            services.AddTransient<DispatcherMiddleware, MyMiddleWare>();
            services.AddTransient<Dispatcher>(sp => {
                var dispatcher = new Dispatcher(sp.GetService, sp.GetServices);
                return dispatcher;
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}