Web API 2 Self Hosting Using OWIN
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Introduction
OWIN stands for Open Web Interface for .Net. In this article I want to show how to use Web API 2 self hosting using OWIN.What Is OWIN
OWIN defines a standard interface between .NET servers and applications. The goal of the OWIN interface is to decouple server and application.Why OWIN
OWIN ideal for self-hosting a application in our own process, outside of IIS.Katana
Katana is an open source project by the Microsoft Open Technologies. It is a set of components for building and hosting OWIN-based applications that follows the OWIN specification.Step By Step To Create Application
Startup.cs
using Owin;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;
namespace Web_API_Self_Hosting_Using_OWIN
{
class Startup
{
// This method is required by Katana:
public void Configuration(IAppBuilder app)
{
var webApiConfiguration = ConfigureWebApi();
// Use the extension method provided by the WebApi.Owin library:
app.UseWebApi(webApiConfiguration);
}
private HttpConfiguration ConfigureWebApi()
{
var config = new HttpConfiguration();
config.Routes.MapHttpRoute(
"DefaultApi",
"api/{controller}/{id}",
new { id = RouteParameter.Optional });
return config;
}
}
}
Product.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Web_API_Self_Hosting_Using_OWIN
{
public class Product
{
public int Id { get; set; }
public string Name { get; set; }
public string Category { get; set; }
public decimal Price { get; set; }
}
}
TestAPIController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;
namespace Web_API_Self_Hosting_Using_OWIN
{
public class TestAPIController : ApiController
{
private static List db = new List
{
new Product { Id = 1, Name = "Monitor", Category = "Hardware", Price = 10000 },
new Product { Id = 2, Name = "Mouse", Category = "Hardware", Price = 1000 },
new Product { Id = 3, Name = "Keyboard", Category = "Hardware", Price = 500 } ,
new Product { Id = 4, Name = "VisualStudio", Category = "Software", Price = 80000 },
new Product { Id = 5, Name = "SqlServer", Category = "Software", Price = 35000 },
new Product { Id = 6, Name = "Oracle", Category = "Software", Price = 40000 }
};
public IEnumerable Get()
{
return db;
}
public Product Get(int id)
{
var Product = db.FirstOrDefault(c => c.Id == id);
if (Product == null)
{
throw new HttpResponseException(System.Net.HttpStatusCode.NotFound);
}
return Product;
}
public IHttpActionResult Post(Product Product)
{
if (Product == null)
{
return BadRequest("Argument Null");
}
var ProductExists = db.Any(c => c.Id == Product.Id);
if (ProductExists)
{
return BadRequest("Exists");
}
db.Add(Product);
return Ok();
}
public IHttpActionResult Put(Product Product)
{
if (Product == null)
{
return BadRequest("Argument Null");
}
var existing = db.FirstOrDefault(c => c.Id == Product.Id);
if (existing == null)
{
return NotFound();
}
existing.Name = Product.Name;
existing.Category = Product.Category;
existing.Price = Product.Price;
return Ok();
}
public IHttpActionResult Delete(int id)
{
var Product = db.FirstOrDefault(c => c.Id == id);
if (Product == null)
{
return NotFound();
}
db.Remove(Product);
return Ok();
}
}
}
ClientHandler.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
namespace Web_API_Self_Hosting_Using_OWIN
{
class ClientHandler
{
string _hostUri;
public ClientHandler(string hostUri)
{
_hostUri = hostUri;
}
public HttpClient CreateClient()
{
var client = new HttpClient();
client.BaseAddress = new Uri(new Uri(_hostUri), "api/TestAPI/");
return client;
}
public IEnumerable GetCompanies()
{
HttpResponseMessage response;
using (var client = CreateClient())
{
response = client.GetAsync(client.BaseAddress).Result;
}
var result = response.Content.ReadAsAsync>().Result;
return result;
}
public Product GetProduct(int id)
{
HttpResponseMessage response;
using (var client = CreateClient())
{
response = client.GetAsync(new Uri(client.BaseAddress, id.ToString())).Result;
}
var result = response.Content.ReadAsAsync().Result;
return result;
}
public System.Net.HttpStatusCode AddProduct(Product Product)
{
HttpResponseMessage response;
using (var client = CreateClient())
{
response = client.PostAsJsonAsync(client.BaseAddress, Product).Result;
}
return response.StatusCode;
}
public System.Net.HttpStatusCode UpdateProduct(Product Product)
{
HttpResponseMessage response;
using (var client = CreateClient())
{
response = client.PutAsJsonAsync(client.BaseAddress, Product).Result;
}
return response.StatusCode;
}
public System.Net.HttpStatusCode DeleteProduct(int id)
{
HttpResponseMessage response;
using (var client = CreateClient())
{
response = client.DeleteAsync(new Uri(client.BaseAddress, id.ToString())).Result;
}
return response.StatusCode;
}
}
}
Program.cs
using Microsoft.Owin.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;
using System.Web.Http.SelfHost;
namespace Web_API_Self_Hosting_Using_OWIN
{
class Program
{
static void Main(string[] args)
{
// Base URL
string url = "http://localhost:9000";
// Calling Handler
var ProductClient = new ClientHandler(url);
Console.WriteLine("Read all the products...");
// Start
using (WebApp.Start(url: url))
{
var companies = ProductClient.GetCompanies();
WriteCompaniesList(companies);
// Get Id
int nextId = (from c in companies select c.Id).Max() + 1;
// Add
Console.WriteLine("Add a new Product...");
var result = ProductClient.AddProduct(
new Product
{
Id = nextId,
Name = "UPS",
Category = "Hardware",
Price = 2500
});
WriteStatusCodeResult(result);
// Update After Add
Console.WriteLine("Updated List after Add:");
companies = ProductClient.GetCompanies();
WriteCompaniesList(companies);
// Update
Console.WriteLine("Update a Product...");
var updateMe = ProductClient.GetProduct(nextId);
updateMe.Name = string.Format("Updated Name UPS", updateMe.Id);
updateMe.Category = string.Format("Updated Category Hardware", updateMe.Id);
updateMe.Price = 3000;
result = ProductClient.UpdateProduct(updateMe);
WriteStatusCodeResult(result);
// Update List After Update
Console.WriteLine("Updated List after Update:");
companies = ProductClient.GetCompanies();
WriteCompaniesList(companies);
// Delete Product
Console.WriteLine("Delete a Product...");
result = ProductClient.DeleteProduct(nextId);
WriteStatusCodeResult(result);
// Update List After Delete
Console.WriteLine("Updated List after Delete:");
companies = ProductClient.GetCompanies();
WriteCompaniesList(companies);
}
Console.ReadLine();
}
static void WriteCompaniesList(IEnumerable companies)
{
try
{
foreach (var Product in companies)
{
Console.WriteLine("Id: {0}, Name: {1}, Category: {2}, Price: {3}", Product.Id, Product.Name, Product.Category, Product.Price);
}
Console.WriteLine("");
}
catch (Exception)
{
throw;
}
}
static void WriteStatusCodeResult(System.Net.HttpStatusCode statusCode)
{
if (statusCode == System.Net.HttpStatusCode.OK)
{
Console.WriteLine("Opreation Succeeded - status code {0}", statusCode);
}
else
{
Console.WriteLine("Opreation Failed - status code {0}", statusCode);
}
Console.WriteLine("");
}
}
}
Out Put
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