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9: Creating Web Applications with ASPNET MVC
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Return RedirectToAction("Index") Catch Return View() End Try End Function
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In the get Edit action method, you need to get a reference to the current record, indicated by the id being passed in, and pass that reference to the View for display The post Edit action method accepts the modified customer and passes it to the repository for update in the database You should also right-click in either of the Edit methods and select Add View Make the View strongly typed, set the class to Customer, and the Content type to Edit The final operation to complete is discussed next, how to delete a Customer
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Deleting a Customer
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The default template for creating a list added an ActionLink for Details, next to the Edit ActionLink You can create a read-only details page if you want, or just ensure the list is in the format you want to show each customer record, but for our purposes the Details option is not necessary So, this example replaces the Details link with one for deleting a record Listing 9-12 shows the Delete Controller method, which replaces the Detail Controller method
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Listing 9-12 The Delete Controller method
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// // GET: /Customer/Delete/5 public ActionResult Delete(int id) { new CustomerRepository() DeleteCustomer(id); TempData["Result"] = "Customer Deleted"; return RedirectToAction("Index"); }
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Microsoft Visual Studio 2010: A Beginner s Guide
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' ' GET: /Customer/Delete/5 Function Delete(ByVal id As Integer) As ActionResult Dim custRep As New CustomerRepository custRepDeleteCustomer(id) TempData("Result") = "Customer Deleted" Return RedirectToAction("Index") End Function
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Besides showing how to use the repository for performing the delete operation, there are a couple of new items in Listing 9-12 that you ll need to know about: TempData and specifying a View TempData is a special object for holding data for a single display of a View So, when the View displays, it can read the current value of TempData, but that same value will not be available on the next View unless the Controller explicitly loads it again In all of the other calls to View, it was assumed that a View named after the Controller method would be returned, so it wasn t necessary to specify the name of the View However, we don t have a delete View, so we specify Index as the View explicitly To accommodate the delete operation, Listing 9-13 shows the modifications on the Indexaspx View for Customers (located under \Views\Customer)
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Listing 9-13 Deleting a Customer
content removed <h2>Index</h2> <p> <% if (TempData["Result"] != null) { %> <label><%= HtmlEncode(TempData["Result"]ToString() )%> </label> <% } %> </p> <table>
9: Creating Web Applications with ASPNET MVC
content removed <% foreach (var item in Model) { %> <tr> <td> <%= HtmlActionLink("Edit", "Edit", new { id=itemCustomerID }) %> | <%= HtmlActionLink("Delete", "Delete", new { id=itemCustomerID })%> </td> content removed
content removed <h2>Index</h2> <p> <% If Not TempData("Result") Is Nothing Then %> <label> <%= HtmlEncode(TempData("Result")ToString())%> </label> <% End If%> </p> <p> <%= HtmlActionLink("Create New", "Create")%> </p> <table> content removed <% For Each item In Model%> <tr> <td> <%=HtmlActionLink("Edit", "Edit", New With {id = itemCustomerID})%> | <%=HtmlActionLink("Delete", "Delete", New With {id = itemCustomerID})%> </td> content removed
Microsoft Visual Studio 2010: A Beginner s Guide
Listing 9-13 has content removed to avoid duplicating code you ve already seen Near the top of the listing, you can see the if statement that will check to see if there is a value in TempData["Result"] (TempData("Result") in VB) and will display that value in a label if present Next to the Edit ActionLink, the Details ActionLink has been changed to a Delete ActionLink, passing the id of the current customer back to the Controller for deletion
Summary
You now know the essential parts of MVC: Models, Views, and Controllers You saw how to implement the repository pattern for managing a data access layer and simplify the code This chapter showed how to create controllers and views You also learned about routing and how it helps match URLs to controllers, actions, and parameters Finally, there was a section that demonstrated how to perform CRUD operations with ASPNET MVC Another popular Web technology is Silverlight, which gives you the ability to create rich user experiences The next chapter helps you get started with Silverlight development
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