Understanding ASPNET MVC in Visual C#

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Understanding ASPNET MVC
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The essential piece of knowledge required to be successful with ASPNET MVC is the Model View Controller pattern In MVC, the Model, View, and Controller are three separate objects Table 9-1 describes the purpose of each MVC object With MVC, you have a clear separation of concerns where Model, View, and Controller have distinct responsibilities This makes it easier to write good programs that you can return to later for fixing bugs and adding new features Besides knowing what each of these three objects is, you must understand their relationship Figure 9-1 illustrates the Model, the MVC Object
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Model View
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Purpose
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The Model is made up of business objects and data Each MVC application typically has a user interface that displays information to a user and allows the user to input data The data that the View displays is read from a Model, and the data that the user adds to the View is assigned to the Model A Controller orchestrates the activities of an application When a user makes a request for your application, ASPNET MVC invokes a Controller The Controller will communicate with the Model and View to ensure the program operates correctly
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Table 9-1 Purpose of MVC Objects
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9: Creating Web Applications with ASPNET MVC
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Request
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View
Model
Figure 9-1 The Model View Controller pattern
View, and the Controller, including relationships There are variations of the relationship between Model, View, and Controller, so rather than a theoretically correct depiction of all scenarios, Figure 9-1 is a simplification that should help you get started In Figure 9-1, you can see that the Controller references both the View and the Model This makes sense when you consider that the Controller is managing the operation of the application The Controller executes in response to a user request Since the Controller is also responsible for coordinating activity between the Model and the View, you can see the relationship in Figure 9-1 where the Controller references the Model The View references the Model because the View must bind data to the user interface and needs to know what data is available The Model does not reference the View or the Controller The Model is an object that holds data and any other members that help manage that data, such as methods for performing validation A typical sequence of operations for an ASPNET MVC operation starts with a request to a Controller The Controller will perform the actions requested, working with the Model The Controller will then give the Model to a View and run the View The View will display Model data and interact with the user for any screen operations Based on user interaction with the View, more requests will be made to a Controller to repeat this process The rest of this chapter shows you how to write the code to make this process work, starting with creating a new ASPNET MVC project
Starting an ASPNET MVC Project
Just as with any other project in VS, you open the New Project window by selecting File | New | Project Then create an ASPNET MVC 2 Web Application project named MyShopCS (MyShopVB for VB) VS will ask if you want to create a test project, and
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you have the option to choose Yes or No Choosing Yes will add a unit testing project to the solution You can choose either option, which won t matter right now because we ll not be covering this topic here, but it is definitely worth exploring on your own Figure 9-2 shows the new project in Solution Explorer VS created several folders with working code:
The Model, View, and Controller folders hold code for the MVC Models, Views, and Controllers, respectively Previous chapters already explained the purpose of the Properties and References folders The App_Data folder is designed to allow you to ship a local database with your application and is ideal for small programs where you can use the free SQL Express database See the accompanying note to learn how to add a database in the App_Data folder The Content folder is where you add any Cascading Style Sheets (CSS) files CSS is a standardized language for defining layout and appearance of a Web site
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