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Creating Controllers
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Recall from Lesson 1 that you create controllers for each item in your model by using the EntityController naming convention, as in CustomerController. Controllers are stored in the Controllers folder. Each controller inherits from the Controller base class (which itself inherits from ControllerBase). Each controller has a set of action methods that are based on user activity, such as adding, updating, inserting, viewing, or deleting one or more entity objects; clicking a link; or submitting a form. There is typically a 1:1 mapping from user action to action method. Action methods are often passed values from the request (as parameters in either the URL or HTTP post). The action methods typically work with the model by instantiating it and calling appropriate methods. Action methods are also responsible for handling errors and validation that occurs within the model. Action methods return a selected ActionResult (typically a view) as a result of the request. The result might pass data to the view from the model. Finally, a WebFormViewEngine class is used to render the results to the user.
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Lesson 2: Creating Models, Views, and Controllers
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The Controller Template
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Visual Studio includes a template that is used for creating controllers. If you right-click the Controllers folder, you will see the Add | Controller option. This brings up the Add Controller dialog box, as shown in Figure 14-7. This template allows you to name your controller and generate method stubs for common scenarios such as create, read, update, and delete (CRUD) activities.
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FigURE 14-7 The Add Controller dialog box for the controller item template in Visual Studio.
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By default, this controller template generates code with the following methods (note that you can change these method names as you see fit): Index, Details, Create, Edit, and Delete. Each of these methods is intended to be used as the method name describes. (Index is used to view a single item.) As an example, suppose that you are using an Entity Framework model tied to the Northwind database. You might opt to define a CustomerController class. This class could include a Details method that is designed to get a customer from the model based on the customer s ID. You would then display those details by using the default details view (Details.aspx), passing the Customer instance as a parameter to the view. The following code is an example.
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Sample of Visual Basic Code Function Details(ByVal id As String) As ActionResult Dim nw As New northwndEntities() Dim custQuery = From c In nw.Customers Where c.CustomerID = id Select c Dim cust As Customer = custQuery.FirstOrDefault() Return View(cust) End Function Sample of C# Code public ActionResult Details(string id) { northwndEntities nw = new northwndEntities(); var custQuery = from c in nw.Customers where c.CustomerID == id select c; Customer cust = custQuery.FirstOrDefault(); return View(cust); }
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This action method would then be called based on the URL routing. By default, a call to http://mySite/customer/details/ALFKI would invoke the CustomerController.Details method and pass the customer ID (ALFKI) as a parameter. The view would then be returned as the Detail.aspx page inside the Views/Customer folder. The view would then use the Customer object sent to it to display information (as you will see in the Creating Views section later in this lesson).
Returning Different ActionResult Objects
The return type for most action methods is ActionResult. The ActionResult class is actually a base class that can be used to define several different result types. Each result type does something different as a result of your action method. Possible types include a ViewResult to show a webpage and a RedirectResult to redirect to another controller. Each action result class has an associated helper method that is exposed by the Controller class. You can use these helper methods in your controller to indicate the appropriate ActionResult, as in using View to indicate ViewResult. These action result classes and their helper methods (in parentheses) are listed here:
viewResult (view)
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