print barcode labels vb.net Public Class CustomerRepository Private m_ctx As New MyShopDataContext in Visual C#

Generator Code39 in Visual C# Public Class CustomerRepository Private m_ctx As New MyShopDataContext

Public Class CustomerRepository Private m_ctx As New MyShopDataContext
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9: Creating Web Applications with ASPNET MVC
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Public Function InsertCustomer( ByVal cust As Customer) As Integer m_ctxCustomersInsertOnSubmit(cust) m_ctxSubmitChanges() Return custCustomerID End Function Public Sub UpdateCustomer(ByVal cust As Customer) Dim currentCust = (From currCust In m_ctxCustomers Where currCustCustomerID = custCustomerID Select currCust)SingleOrDefault()
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If Not currentCust Is Nothing Then With currentCust Age = custAge Birthday = custBirthday Income = custIncome Name = custName End With m_ctxSubmitChanges() End If End Sub Public Function GetCustomer(ByVal custID As Integer) As Customer Dim customer = (From cust In m_ctxCustomers Where custCustomerID = custID Select cust)SingleOrDefault() Return customer End Function Public Function GetCustomers() As List(Of Customer) Dim customers =
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(From cust In m_ctxCustomers Select cust)ToList() Return customers End Function Public Sub DeleteCustomer(ByVal custID As Integer) Dim customer = (From cust In m_ctxCustomers Where custCustomerID = custID Select cust)SingleOrDefault() m_ctxCustomersDeleteOnSubmit(customer) m_ctxSubmitChanges() End Sub End Class
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You can have more methods in a repository for doing whatever is required with data for the application, but the items in Listing 9-6 are typical The LINQ to SQL operations are consistent with the material covered in 7, so there s no need to repeat the same material here The purpose of the repository is to give the Controller an object to work with for getting data without filling up Controller methods with data access logic Let s see how the Controller works with this repository next
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Creating a Customer Controller
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Right-click the Controllers folder, select Add | Controller, or press CTRL-M, press CTRLC, and name the file CustomerController Check the box for Add action methods for Create, Update, and Details scenarios as shown in Figure 9-4
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Figure 9-4 Creating a new Controller
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This will create a new Controller with several methods for working with Customer data Listing 9-1 already showed what a Controller looks like, and this is no different, except that it contains more action methods The following sections explain how to perform various operations on customer data
Displaying a Customer List
The first thing to do with customers is to display a list that will serve as a starting point for other operations Listing 9-7 shows the Index action method of the CustomerController and how it gets a list of customers to display The code uses the CustomerRepository, created in the preceding section For C#, you need to add a using directive at the top of the file for the MyShopCSModels namespace
Listing 9-7 A Controller for displaying a list
public ActionResult Index() { var customers = new CustomerRepository() GetCustomers(); return View(customers); }
Function Index() As ActionResult Dim custRep As New CustomerRepository Dim customers As List(Of Customer) customers = custRepGetCustomers() Return View(customers) End Function
Listing 9-7 shows how the Index method uses the CustomerRepository to get the list of customers You need to pass that list to the View for display To create the View, right-click anywhere in the Index method and select Add View, which will display the Add View window, shown in Figure 9-5 The name of the View is Index, corresponding to the name of the action method invoking the View Naming the View after the action method is the default behavior, but
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Figure 9-5 The Add View window
you can name the View anything you want If the View you need to display is named differently than the action method, you can use the following View method overload:
View("SomeOtherViewName", customers);
We want to use a strongly typed View, meaning that you will have IDE support for referencing the properties of your own object when working in the View The selected object is Customer, which is already defined as a LINQ to SQL entity, which is the same type returned by the call to the GetCustomers method in CustomerRepository The purpose of this View is to display a list of customers, so we ll select List as View content This will prepopulate the View with a template for displaying customers You ll be able to modify the screen as you like Additionally, if you prefer to write your own code to populate the screen, you can select the Empty option for View content and then code the View manually yourself Selecting List is a quick way to get started You learned about MasterPages earlier in this chapter, and you have the option of selecting a MasterPage of your choice and specifying which ContentPlaceHolder your code will render in Click Add to generate the View shown in Listing 9-8
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