WPF data binding (IV)

Binding of filtered data sources , Use Linq Filter Data Collection. Filter the set of data objects that meet the set conditions from the data set .

UI Design :

Design list control , Bind the data source to the control in the background

Grid Element is bound to the object selected in the list , such Grid Other controls in can be bound to the property field of the selected object

Background code design :

Define a global data set

private ICollection products;

Filter datasets by criteria , Assign a value to a variable , Then bind the control data source to the variable

products = App.StoreDb.GetProductsFilteredWithLinq(decimal.Parse(txtMinimumCost.Text));

listProducts.ItemsSource = products;

among Linq The query function is as follows :

The parameter passed in is the lowest price of the product

public ICollection GetProductsFilteredWithLinq(decimal minimumCost)

{

// Get the full list of products.

ICollection products = GetProducts();

// Create a second collection with matching products.

IEnumerable matches = from product in products

where product.UnitCost >= minimumCost

select product;

return new ObservableCollection(matches.ToList());

}