curiosi.y killed th. code?

at June 13, 2017

A memo to myself about Web API REST code using Owin Katana packages.

Program.cs

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



using Owin;
using Microsoft.Owin.Hosting;

using System.IO;

using System.Web.Http; 




namespace KatanaIntro
{


    // AppFunc alias. 
    using AppFunc = Func<IDictionary<string, object>, Task>; 


    class Program
    {
        static void Main(string[] args)
        {

            string Uri = "http://localhost:12345";

            using (WebApp.Start<Startup>(Uri))
            {
                Console.WriteLine("Web server started and listening ... ");
                Console.ReadKey();
                Console.WriteLine("Web server stopping ... "); 
            }


        }
    }





    public class Startup
    {


        public void Configuration(IAppBuilder App)
        {


            //// Return welcome page. 
            //App.UseWelcomePage();


            // Katana wrapper for OWIN. 
            //App.Run(
            //    // Use lambda to access the function. 
            //    ctx =>
            //    {
            //        // Access function data. 
            //        // Return a task. 
            //        // ctx.


            //        // Hello world. 
            //        return ctx.Response.WriteAsync("Hello world!");


            //    }
            //);




            // Test. 
            //App.Run(Context =>
            //{

            //    Context.Response.ContentType = "text/plain";
            //    return Context.Response.WriteAsync("Testing using content type ... ");

            //}
            //);



             


            // Dump environment. 
            //App.Use(async (ContextEnvironment, Next) =>
            //{

            //   foreach (var Item in ContextEnvironment.Environment)
            //       Console.WriteLine("{0}:{1}", Item.Key, Item.Value);

            //   await Next();


            //});



            // Dump request. 
            App.Use(async (ContextEnvironment, Next) =>
            {
                Console.WriteLine("Requesting: " + ContextEnvironment.Request.Path);
                await Next();

                //ContextEnvironment.Response.StatusCode = 404; 

                Console.WriteLine("Response: " + ContextEnvironment.Response.StatusCode); 
            });





            ConfigureWebApi(App); 



            // Use HelloWorldComponent. 
            App.Use<HelloWorldComponent>();

            // Syntactic sugar call. 
            //App.UseHelloWorld();




        }


        private void ConfigureWebApi(IAppBuilder App)
        {

            var Config = new HttpConfiguration();

            Config.Routes.MapHttpRoute(
                "DefaultApi",
                "api/{controller}/{id}",
                new { id = RouteParameter.Optional }
            );

            App.UseWebApi(Config); 

        }



    }




    // Syntactic sugar definition. 
    public static class AppBuilderExtensions
    {
        public static void UseHelloWorld(this IAppBuilder App)
        {
            App.Use<HelloWorldComponent>(); 
        }
    }




    public class HelloWorldComponent
    {

        AppFunc _NextComponent; 

        public HelloWorldComponent(AppFunc NextComponent)
        {
            _NextComponent = NextComponent;
        }


        //public Task Invoke(IDictionary<string, object> Environment)
        // public async Task Invoke(IDictionary<string, object> Environment)
        public Task Invoke(IDictionary<string, object> Environment)
        {
            //return null; 

            // await _NextComponent(Environment);  

            var Response = Environment["owin.ResponseBody"] as Stream;
            using (var Writer = new StreamWriter(Response))
                return Writer.WriteAsync("Hello using StreamWriter and owin.ResponseBody ... "); 

        }

    }



}

Models/Greeting.cs

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

namespace KatanaIntro
{
    public class Greeting
    {
        public string Text { get; set; }
    }

}

Controllers/GreetingController.cs

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

using System.Web.Http; 


namespace KatanaIntro
{
    public class GreetingController : ApiController
    {
        [AllowAnonymous] 
        [Route("api/Greeting")] 
        public Greeting Get()
        {
            return new Greeting { Text = "Hello world!" }; 
        }

    }

}

Notes to self:

1. Dlls not copied into bin folder (causes 404s).

2. App.config not copied into Web.config (causes http error 500).

Could not load file or assembly 'Microsoft.Owin, Version=2.0.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies.

The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Notes on executing:

Check KatanaIntro properties, Output type = Class Library (dll for IIS Express) or Console App (standalone exe).

cd "C:\Users\DaviesE\Documents\MyWork\Visual Studio 2015\Projects\KatanaIntro\KatanaIntro"

IIS/Local/Debug
http://localhost:12345/api/Greeting

"c:\Program Files\IIS Express\iisexpress.exe" /path:"C:\Users\DaviesE\Documents\MyWork\Visual Studio 2015\Projects\KatanaIntro\KatanaIntro"

"c:\Program Files\IIS Express\iisexpress.exe" /path:"C:\Users\DaviesE\Documents\MyWork\Visual Studio 2015\Projects\KatanaIntro\KatanaIntro" /port:12345

References:

https://docs.microsoft.com/en-us/aspnet/aspnet/overview/owin-and-katana/getting-started-with-owin-and-katana

https://docs.microsoft.com/en-us/iis/troubleshoot/using-failed-request-tracing/troubleshooting-failed-requests-using-tracing-in-iis

https://forums.asp.net/t/1964954.aspx?Could+not+load+file+or+assembly+Microsoft+Owin+

https://stackoverflow.com/questions/26133826/could-not-load-file-or-assembly-system-web-http-owin

https://stackoverflow.com/questions/20128919/owin-middleware-results-in-404-on-server

https://stackoverflow.com/questions/25071894/microsoft-owin-staticfiles-works-in-console-host-but-i-get-a-404-in-iis-on-file

https://katanaproject.codeplex.com/wikipage?title=Static%20Files%20on%20IIS

http://codeclimber.net.nz/archive/2014/08/22/How-to-get-integrated-debugging-in-Visual-Studio-with-OwinHost/

https://docs.microsoft.com/en-us/iis/get-started/planning-your-iis-architecture/introduction-to-applicationhostconfig

https://dotnetcodr.com/2014/04/14/owin-and-katana-part-1-the-basics/

http://dailydotnettips.com/2014/01/29/5-internal-things-that-you-should-know-about-iis-express/