public ClientSideQuerying()
{
InitializeComponent();
// Define and bind a live view of expensive non-discontinued products ordered by price.
_viewProducts =
(from p in _scope.GetItems <Product>()
where !p.Discontinued && p.UnitPrice >= 30
orderby p.UnitPrice
select new
{
ProductID = p.ProductID,
ProductName = p.ProductName,
CategoryID = p.CategoryID,
CategoryName = p.Category.CategoryName,
SupplierID = p.SupplierID,
Supplier = p.Supplier.CompanyName,
UnitPrice = p.UnitPrice,
QuantityPerUnit = p.QuantityPerUnit,
UnitsInStock = p.UnitsInStock,
UnitsOnOrder = p.UnitsOnOrder
}).AsDynamic(); // AsDynamic() is required for data binding because an anonymous class is used (select new...)
dataGrid1.ItemsSource = _viewProducts;
// Define a view of seafood products. Filtering is performed on the server.
_seafoodProductsView = _scope.GetItems <Product>().AsFiltered(p => p.CategoryID == 8);
// Bind the label text to the number of products in the view
textBlockCount.SetBinding(TextBlock.TextProperty, new Binding("Value")
{
Source = _viewProducts.LiveCount()
});
}
public CategoryProductsViewModel()
{
// These binding sources will be used by the CategoryProductsView
// to display categories and products.
Categories = new BindingSource(
from c in _scope.GetItems <Category>()
select new CategoryViewModel()
{
CategoryID = c.CategoryID,
CategoryName = c.CategoryName
}, null);
// Products are filtered by CategoryID on the server.
// Filtering is performed automatically when the current Category changes.
// Product suppliers are fetched along with the products.
Products = new BindingSource(
from p in _scope.GetItems <Product>().AsFilteredBound(p => p.CategoryID)
.BindFilterKey(Categories, "Current.CategoryID").Include("Supplier")
select new ProductViewModel()
{
ProductID = p.ProductID,
ProductName = p.ProductName,
CategoryID = p.CategoryID,
CategoryName = p.Category.CategoryName,
SupplierID = p.SupplierID,
SupplierName = p.Supplier.CompanyName,
UnitPrice = p.UnitPrice,
QuantityPerUnit = p.QuantityPerUnit,
UnitsInStock = p.UnitsInStock,
UnitsOnOrder = p.UnitsOnOrder
}, null);
}
public DataSourcesInCode()
{
InitializeComponent();
// Bind the category combo box to the category view
// and show the products of the first category in the data grid.
ClientView <Category> viewCategories = _scope.GetItems <Category>();
comboBox1.DisplayMemberPath = "CategoryName";
comboBox1.ItemsSource = viewCategories;
BindGrid(viewCategories.First().CategoryID);
}
public MainWindow()
{
InitializeComponent();
// Initialize the client cache and the client scope.
_clientCache = new EntityClientCache(new NORTHWNDEntities());
_scope = new EntityClientScope(_clientCache);
// Bind a combo box to the list of cities
// using a live view of customers grouped by city.
comboCity.ItemsSource =
(from c in _scope.GetItems <Customer>()
group c by c.City into g
orderby g.Key
select new
{
City = g.Key,
Customers = g
}).AsDynamic();
}
