How to Deploy and Host ASP.Net Web API ?

1. Host ASP.NET Web API, using OWIN to self-host
2. Host ASP.NET Web API in an Azure Worker Role

OWIN stands for Open Web Interface for .NET 

Step1: Create a Console Application called OWINSelfHostingWebAPI

Step2: Install the WebAPI OWIN selfhost package and all the required OWIN packages using NuGet Package Manager Console.

Install-Package Microsoft.AspNet.WebApi.OwinSelfHost

Step3: Configure Web API for self-host.

In Solution Explorer, right-click the project and select Add / Class to add a new class. Name the class Startup and add the below code.

using Owin; using System.Web.Http; namespace OwinSelfhostSample { public class Startup { // This code configures Web API. The Startup class is specified as a type // parameter in the WebApp.Start method. public void Configuration(IAppBuilder appBuilder) { // Configure Web API for self-host. HttpConfiguration config = new HttpConfiguration(); config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); appBuilder.UseWebApi(config); } } }

Step4: Start the OWIN Host and Make a Request Using HttpClient. Replace all the code in the Program.cs file with the following:

using Microsoft.Owin.Hosting; using System; using System.Net.Http; namespace OwinSelfhostSample { public class Program { static void Main() { string baseAddress = "http://localhost:9000/"; // Start OWIN host using (WebApp.Start<Startup>(url: baseAddress)) { // Create HttpCient and make a request to api/values HttpClient client = new HttpClient(); var response = client.GetAsync(baseAddress + "api/values").Result; Console.WriteLine(response); Console.WriteLine(response.Content.ReadAsStringAsync().Result); Console.ReadLine(); } } } }

Step5: Add a web API controller in your solution named value controller.

using System.Collections.Generic; using System.Web.Http; namespace OwinSelfhostSample { public class ValuesController : ApiController { // GET api/values public IEnumerable<string> Get() { return new string[] { "value1", "value2" }; } // GET api/values/5 public string Get(int id) { return "value"; } // POST api/values public void Post([FromBody]string value) { } // PUT api/values/5 public void Put(int id, [FromBody]string value) { } // DELETE api/values/5 public void Delete(int id) { } } }

Step6: Run the application.