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Monday, 4 November 2013

Subdomain with ASP.NET MVC using Attribute Routing

ASP.NET MVC Routing allows defining various mappings and recently I have looked at an interesting framework known as Attribute Routing.

Using Attribute Routing setting up a subdomain for your website that uses ASP.NET MVC is very simple. Now consider you have a website and you would want to define subdomains such as,, etc.... Each of these subdomain can be a different project (any technology such as webforms, MVC etc) by themselves or can be an area defined in an ASP.NET MVC project.

Lets consider we are going to follow the approach of having areas inside ASP.NET MVC project. Here are the list of steps to achieve this.

1. Create your ASP.NET MVC project with all the content and publish to your IIS. You should now be able to access your website using http://localhost/csharptechies or based on your machine You could define hosts file to include the references.

I have added following to "hosts" file under C:\Windows\System32\Drivers\etc with data as

Now website can be accessed as\csharptechies(ie.. http://localhost/csharptechies)

2. Lets code for subdomain routing. First add references for attribute routing via nuget using "Install-Package AttributeRouting"

3. Create an area with the name "Blog".

4. Add a new folder "Blog" under "Areas\Blog\Views". create a new view "articles" under "Areas\Blog\Views\Blog"

5. Add a controller BlogController.cs with following code under "Areas\Blog\Controllers"
 [RouteArea("Blog", Subdomain = "blog")]
    public class BlogController : Controller
        // GET: /articles/
        public ActionResult articles()
            return View();
6. Update "AttributeRoutingConfig.cs" to add routing to blog
public static class AttributeRoutingConfig
  public static void RegisterRoutes(RouteCollection routes) 
routes.MapAttributeRoutes(config => config.AddRoutesFromController());

        public static void Start() 

7. Now add new entry to hosts file

8. Publish latest version of the project and using IE browse to the website as

This will show the view as articles, since BlogController now understands the attribute definition of subdomain as "blog" it will route the url to blog instead of standard csharptechies website. You could also look at possible routing via\csharptechies\routes.axd

Technology is just a tool. In terms of getting the kids working together and motivating them, the teacher is the most important.
Bill Gates


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