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ASP.NET MVC
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In the View content drop-down menu, select the Edit option to have Visual Studio create a basic edit template for you. Click Add. Open ~/Controllers/FilmController.cs. Add two Edit methods (one for loading the view and one for handling the submission of data): [AcceptVerbs("GET")] public ActionResult Edit(int ID) { return View(filmRepository.GetFilm(ID)); } [AcceptVerbs("POST")] public ActionResult Edit(BobsMoviesMVC.Models.Film Film) { if (Film.IsValid() == true) { filmRepository.Update(Film); return RedirectToAction("All"); } else { foreach (BobsMoviesMVC.Models.Error error in Film.GetErrors()) { ModelState.AddModelError(error.Property, error.Description); } return View(filmRepository.GetFilm(Film.FilmID)); } }
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Press F5 to run the application. Click the Example 4 Edit Strongly Typed link (this is hard-wired to take you to a specific film).
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10. Delete the title of the film and click Submit. You should see a screen similar to Figure 13-8.
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Figure 13-8. ASP.NET MVC validation Note that MVC will not allow you to save a film with a blank title (because of the validation rules created earlier). Enter a new title, click Save, and note that you were redirected back to the All Films page with the updated data. Whew, we covered a lot here:
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You created two actions with the same name that were differentiated by GET and POST attributes (covered in the next section). You did not allow a user to save a film with no title because you utilized the Film.IsValid method on the film class. If the film was not valid, you then displayed the returned error messages to the user by using the ModelState.AddModelError(error.Property, error.Description) method.
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Because you have two Edit ActionResults, you used an attribute to tell ASP.NET MVC to use one method when the page is loaded (AcceptVerbs["GET"]) and another when the user submits data (AcceptVerbs["POST"]). The AcceptVerbs attribute refers to the method in the HTTP protocol that is used when the browser communicates with the server. The use of the AcceptVerbs attribute can assist with making the code a bit neater, but some developers might prefer having a load and edit controller action instead.
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ASP.NET MVC
Creating an Add New and Delete Functionality
Let s finish off the skeleton administration interface by adding the facility for users to create new movies and delete existing movies: 1. 2. 3. 4. 5. Right-click View folder. Click Add View. Call it Create.
Select to create a strongly typed view and select BobsMoviesMVC.Models.Film as the View data class. Select Create as the View content. Open ~/Views/Film/Create.aspx. Remove the FilmID field code: <p> <label for="ID">ID:</label> <%= Html.TextBox("ID") %> <%= Html.ValidationMessage("ID", "*") %> </p>
6. 7.
Open ~/Controllers/Film/FilmController.cs. Add the following code to handle the create and delete actions: [AcceptVerbs("GET")] public ActionResult Create() { return View(); } [AcceptVerbs("POST")] public ActionResult Create(BobsMoviesMVC.Models.Film film) { filmRepository.Add(film); return RedirectToAction("All"); } public ActionResult Delete(int ID) { filmRepository.Delete(ID); return RedirectToAction("All"); }
CAUTION In a real-life application, be very careful with creating a delete method like this. I am taking shortcuts to avoid tedious steps. It is bad practice for methods that modify data to be activated by a GET method imagine if a search engine crawled your site and accidently deleted data!
8. 9. Press F5 to run the application. Click the Example 2 All Films link. You should now be able to delete movies by clicking the Delete link and create new movies by clicking the Create link.
ASP.NET MVC
Accepting Data from Users
In the previous example, you let ASP.NET MVC infer how to bind the submitted data back to the model. However, what if you did not want users to be able to alter all the properties of Film For example in the previous page you exposed the ID property There are a couple of methods to restrict this:
Specify individual properties
You can specify the individual form elements that you will accept in your controller methods (make sure that the name of the variable matches the name of the form element that is getting submitted) in your edit method. MVC will then bind these properties accordingly: [AcceptVerbs("POST")] public ActionResult Edit(string Title, string Description) { return RedirectToAction("All"); }
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