#976 – SelectedItem Binding on an ItemsControl is Two-Way

When you use data binding to associate a property in your data context to the currently selected item in an ItemsControl (e.g. a ListBox), the data binding is by default two-way.  That is:

  • When the user selects a new item in the list, the value of the bound property changes
  • If the value of the bound property changes, the selection in the list changes

Suppose that we bind the ItemsSource of a ListBox to a collection of Actor objects and that we bind the SelectedItem property of the ListBox to a SelectedActor property in our data context (of type Actor).

When the user selects an item, the value of the SelectedActor property changes.  (Below, the labels are bound to sub-properties of SelectedActor).

976-003

If we instead change the value of SelectedActor (e.g. in code-behind after clicking a button), the currently selected item in the ListBox will change.

976-004

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #976 – SelectedItem Binding on an ItemsControl is Two-Way

  1. Pingback: Dew Drop – December 26, 2013 (#1690) | Morning Dew

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