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Before implementing the POST overload of the Edit() action method, let s add a new test to CatalogEditing that defines and verifies that action s behavior. You should check that, when passed a Product instance, the method saves it to the repository by calling productsRepository.SaveProduct() (a method that doesn t yet exist). Then it should redirect the visitor back to the Index action.

[Test] public void Can_Save_Edited_Product() { // Arrange: Given a repository and a product var mockRepository = new Mock<IProductsRepository>(); var product = new Product(); // Act: When a user tries to save the product var result = new AdminController(mockRepository.Object).Edit(product); // Assert: Then the product is saved and the user is suitably redirected mockRepository.Verify(x => x.SaveProduct(product)); result.ShouldBeRedirectionTo(new { action = "Index" }); }

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using System; namespace SilverlightTasks { public class Task { public string Title { get; set; } public string Description { get; set; } public DateTime DueDate { get; set; } } } We will implement the Silverlight application as a MVVM application. This pattern helps to separate out the loading concerns of the data context into layers. In fact, the MVVM model is similar to the ASP.NET MVC pattern that has become popular, with a few exceptions. We will take advantage of MVVM by instantiating an Entities folder that contains our simple Task class, and a ViewModel folder that contains our TaskViewModel. The project looks like Figure 6 10 when completed.

This test will give rise to a few compiler errors: there isn t yet any Edit() overload that accepts a Product instance as parameter, and IProductsRepository doesn t define a SaveProduct() method. We ll fix that next. You could also add a test to define a behavior such that when the incoming data is invalid, the action method will simply redisplay its default view. To simulate invalid data, add to the // Arrange phase of the test a line similar to the following:

Figure 2-6. Interchangable datasources Both of the solutions I ve described work sufficiently if there is not a great deal of data. But after there is a significant amount of data, the time necessary to transfer all that data between the database and application will become unreasonably long because the query is transferring all the data each time. The sheer size of the data being pulled from the database

controller.ModelState.AddModelError("SomeProperty", "Got invalid data"); You can t get very far with saving an updated Product to the repository until IProductsRepository offers some kind of save method (and if you re following in TDD style, your last test will be causing compiler errors for want of a SaveProduct() method). Update IProductsRepository: public interface IProductsRepository { IQueryable<Product> Products { get; } void SaveProduct(Product product); } You ll now get more compiler errors because neither of your two concrete implementations, FakeProductsRepository and SqlProductsRepository, expose a SaveProduct() method. It s always party time with the C# compiler! To FakeProductsRepository, you can simply add a stub that throws a NotImplementedException, but for SqlProductsRepository, add a real implementation: public void SaveProduct(Product product) { // If it's a new product, just attach it to the DataContext if (product.ProductID == 0)

productsTable.InsertOnSubmit(product); else if (productsTable.GetOriginalEntityState(product) == null) { // We're updating an existing product, but it's not attached to // this data context, so attach it and detect the changes productsTable.Attach(product); productsTable.Context.Refresh(RefreshMode.KeepCurrentValues, product); } productsTable.Context.SubmitChanges(); } At this point, you re ready to implement a POST-handling overload of the Edit() action method on AdminController. The view at /Views/Admin/Edit.aspx generates input controls with names corresponding to the properties on Product, so when the form posts to an action method, you can use model binding to receive a Product instance as an action method parameter. All you have to do then is save it to the repository. Here goes: [HttpPost] public ActionResult Edit(Product product) { if (ModelState.IsValid) { productsRepository.SaveProduct(product); TempData["message"] = product.Name + " has been saved."; return RedirectToAction("Index"); } else // Validation error, so redisplay same view return View(product); }

Figure 6 10. MVVM additions The Task class is a simple class, as you can see next. 6. The TaskViewModel.cs class is where we will abstract away the loading of all the data. This way the front end MainPage will not have to have the concerns for data loading mixed up in what it will accomplish. It simply uses a DataContext that is set to the ViewModel, and the elements load themselves on the page. Add code to the TaskViewModel class as follows:

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