MVVM Survival Guide for Enterprise Architectures in Silverlight and WPF

Listing the customers

The next thing we need to do is to get a list of customers to display in the UI. Our approach will be to create a data provider that will query the entity framework to get our entities, which we will use as our models. To accomplish this, follow these steps:

1. Add a project reference from Northwind.ViewModel to Northwind.Data.
2. Add a .NET reference to System.Data.Entity.
3. Add using statements for System.Collections.Generic, Northwind.Data, and System.Data.Objects to MainWindowViewModel.
4. Add the following code to MainWindowViewModel:

   private IList<Customer> _customers; public IList<Customer> Customers { get { if (_customers == null) { GetCustomers(); } return _customers; } } private void GetCustomers() { _customers = new NorthwindEntities() ...