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DataBinding Support Overview

Data binding allows you to establish a link between the UI and the underlying business logic and to keep them synchronized. It means that when a value is changed in the business layer, that change is automatically populated to the UI and vice versa. Of course, in order for this to work, you have to implement the proper notification or to use objects that have already implemented it.

Binding to RadComboBox involves the following property:

  • RadComboBox.ItemsSource - gets or sets the data source (IEnumerable) used to generate the content of the combo box control. It can be bound to data from a variety of data sources in the form of common language runtime (CLR) objects.

Supported Data Sources

You can bind RadComboBox to the following types of data sources:

Change Notification Support

To bind the RadComboBox to a collection of business objects, you should use its ItemsSource property. If you want the changes to the collection to be automatically reflected to the RadComboBoxItems, the collection should implement the INotifyCollectionChanged interface. There is a built-in collection in WPF, which implements the INotifyCollectionChanged interface and you could use it without making any effort - this is the generic ObservableCollection. However, to get full benefit from the change notification support, your custom business objects should implement the INotifyPropertyChanged interface.

Consider using ObservableCollection or one of the other existing collection classes like List, Collection, instead of implementing your own collection. If the scenario requires a custom collection to be implemented, use the IList interface, which provides individual access by index to its items and the best performance.

Data Templates

The ItemsSource property allows the RadComboBox to be bound to any collection that implements the IEnumerable interface. For each item in the collection, a container of type RadComboBoxItem is created. By using the ItemTemplate, ItemContainerStyle and TemplateSelectors you can control the appearance of the dynamically created items.

Besides the RadComboBox's ItemTemplate property, you could use the DisplayMemberPath property for controlling the appearance of the created items.

If neither the DisplayMemberPath nor the ItemTemplate are set, then the content of the item would be set to the value returned by the ToString() method of the business object.

See Also

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