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European ASP.NET MVC 4 Hosting - Amsterdam :: Create Separate Web API’s Action for Mobile Request: ASP.NET MVC 4

clock June 19, 2012 07:11 by author Scott

ASP.NET MVC 4.0 has two great features: One is Display Mode allows you to create mobile-specific and desktop-specific views and Second is Web API platform for building RESTful applications. Sometimes, You might need to return different data or perform different operations for desktop and mobile request. This article explains how to implement separate actions for mobile request keeping same URL format in Web API.

1. In Visual Studio, Select File > New Project > ASP.NET MVC 4 Web Application > Enter name > OK


2. Select ‘Web API‘ > View Engine: ‘Razor‘ > OK


3. You’ll get default ValuesController. When you access <your app url>/api/Values, the array of string value1, value2 is returned.


To create separate action for mobile request, We are going to create separate controller having ‘Mobile‘ suffix.


Right Click on ‘Controllers‘ folder > Add Controller > Give Name ‘ValuesMobileController‘ > Template: ‘API Controller with empty read/write actions‘ > Add


To differentiate both controllers, replace value1, value2 to mobile-value1, mobile-value2 in get method.


4. Now our object is to call action of Mobile controller when request comes from mobile device.


In Global.asax:


default api route:


routes.MapHttpRoute(
              name: "DefaultApi",
              routeTemplate: "api/{controller}/{id}",
              defaults: new { id = RouteParameter.Optional }
          );

Change it to


routes.MapHttpRoute(
               name: "DefaultApi",
               routeTemplate: "api/{controller}/{id}",
               defaults: new { id = RouteParameter.Optional }
           ).RouteHandler = new MyRouteHandler();

and add following class:


public class MyRouteHandler : HttpControllerRouteHandler
   {
       protected override IHttpHandler GetHttpHandler(RequestContext requestContext)
       {
           //Check whether request comes from mobile browser
           if (requestContext.HttpContext.Request.Browser.IsMobileDevice)
           {
               string controller = requestContext.RouteData.Values["controller"].ToString();
               requestContext.RouteData.Values["controller"] = controller + "Mobile";
           }
           return new MyHttpControllerHandler(requestContext.RouteData);
       }
   }

   public class MyHttpControllerHandler : HttpControllerHandler, IRequiresSessionState
   {
       public MyHttpControllerHandler(RouteData routeData)
           : base(routeData)
       {
       }
   }

You have to import following namespaces:


using System.Web.Http.WebHost;
using System.Web.SessionState;

In this RouteHandler, Request.Browser.IsMobileDevice checks whether request comes from mobile browser and change controller name with ‘Mobile‘ suffix.

Now run app on browser, For testing, You can change user-agent to iPhone with user agent switcher Firefox add-on and open same URL. you’ll get mobile-value1 and mobile-value2.



Hope it helps

 



European ASP.NET MVC 4 Hosting - Amsterdam :: Building a Northwind Single Page Application using ASP.NET MVC 4 Beta - Part 2

clock June 4, 2012 08:29 by author Scott

Please see the previous post at here.

Once I removed all the TasksController files and the TodoItem, I chose the Models folder, right click and “Add New Item” and searched for “ADO.NET Entity Model” and added it to the folder.




It allowed me to connect to the Northwind database through “Generate from database” and I selected just three tables “Products”, “Categories” and “Suppliers” table for simplicity. At the end of the wizard, we get a EDMX design file with the 3 tables. On this screen I right clicked and choose “Add Code Generation Item” as below




and then in the dialog that came up, chose the “ADO.NET DbContext Generator” and Added (note, if you don’t see this template, you probably don’t have
Entity Framework 4.1 installed)

This step created the Model1.Context (not required for us though) and the Model1.tt template which groups the individual class files for each of the tables above (these are required)


The next thing I did, was to remove the NorthwindEntities connectionstring that got automatically added when we followed the ADO.NET Entity Model wizard. We don’t need this connection string.


Also, I deleted the Model1.Context file and also the Model1.cs files which are not required (we will be generating a new context to suit our database name)




Note that these files are not required only for our SPA approach here and they are required when working with EF CodeFirst normally as they do the DbSet Tracking and whole bunch of things


So, we now have the basic model classes required for wiring up our Controller required to create the SPA Pages. One important thing I learnt in this process was that, I had to edit the Model classes as follows:-


In Supplier.cs added the “private” keyword to the ICollection<Products> property. Same is the case with Category.cs. Otherwise you would run into an
error explained here.



After this, I added Controller for Products as per the settings below (Right Click Controller – Add –Controller)




Note several important things. I have chosen the “Single Page Application with read/write actions and views, using Entity Framework” template under Scaffolding options. Also, I have edited the Data context class and made it simply MvcApplication126.Models.Northwind. This would be referenced in the web.config connection string as well so that SPA picks up our existing Northwind database instead of creating a new one.


Once you click “Add” the following files are generated.


Under Controllers


- NorthwindController.cs

- NorthwindController.Product.cs
- ProductsController.cs

Under Scripts


- ProductsviewModel.js


Under Views


- Products folder and the Views and Partial Views required


Repeat the steps for adding Controllers for “Categories” and “Suppliers” and the only change would be the respective Model Classes.


One important thing to do is to add the following connectionstring to the web.config file


<add name="Northwind" connectionString="Data Source=SERVERNAME;Initial Catalog=Northwind;User Id=YOUR USER NAME;Password=YOUR PASSWORD" providerName="System.Data.SqlClient" />


Then, when you run the project, it opens up the default Home Page.


- Navigate to /Products and it should load the list of Products from Northwind database.

- Click on each product and edit and note that everything happens in a single page inline.
- Just notice the URLs change in pattern with hash tags.
- Notice that the Categories and Suppliers are wired up as dropdownlists since these are foreign key references.
- Notice that all the items load asynchronously

I went ahead and edited the Shared –> Layout.cshtml under Views folder to add Menu Items for Products, Categories and Suppliers, as below:-


<ul id="menu">
<li>@Html.ActionLink("Home", "Index", "Home")</li>
<li>@Html.ActionLink("Products", "Index", "Products")</li>
<li>@Html.ActionLink("Categories", "Index", "Categories")</li>
<li>@Html.ActionLink("Suppliers", "Index", "Suppliers")</li>
<li>@Html.ActionLink("About", "About", "Home")</li>
<li>@Html.ActionLink("Contact", "Contact", "Home")</li>
</ul>


Now, we have our full blown Northwind Traders Application running as a SPA.


You can download the sample from
https://skydrive.live.com/redir.aspx?cid=069f94a102eff49a&resid=69F94A102EFF49A!919&parid=root

 

 



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