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ASP.NET Web API


ASP.NET Web API is a framework based on ASP.NET for building HTTP endpoints. The ASP.NET Web API can be built as a part of ASP.NET Webforms or MVC to function as the services layer of a  web, mobile or client desktop application.

ASP.NET Web API is recommended over WCF in many situations except if you are limited to use .NET 3.5 and/or if you need to expose a SOAP based service endpoints.

ASP.NET Web API is different from REST since it may not fully comply with a RESTful architecture, however, a  REST based service can be built on top of Web API.

Creating a simple ASP.NET Web API

1. Open Visual studio

2. Create a new project Template > Visual C# > Web > ASP.NET Empty Web Application


3. Right click on the project > Manage NuGet Packages...


> Search for Web API  > select Microsoft ASP.NET Web API > click Install


> Click Close


4. Add a new class to the project, name it MyApiController.



5. Derive the new class from ApiController class and add a public method called Get() that returns string value.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;

namespace WebAPIEx1
{
    public class MyApiController : ApiController
    {
        public string Get()
        {
            return "Hello World";
        }
    }

}

7. Right click the project > select Add > New Item... > select Global Application Class > click Add.




8. In the application_start method, add the following line:

GlobalConfiguration.Configuration.Routes.Add("default", new HttpRoute("{controller}"));


9. Build the application 

10. Right click on the project and click view in browser. 



11. Add "MyAPI" to the url and press enter.






12. Open the .json file in a note pad.


Reference

WCF and ASP.NET Web API - https://msdn.microsoft.com/en-us/library/jj823172(v=vs.110).aspx


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