Q: WHEN THE SELECTIONCHANGED EVENT GETS RAISED, HOW DO I GET THE NEW SELECTION?

Awadhendra Tiwari

Total Post:510

Points:2550
Posted by  Awadhendra Tiwari
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  1. Awadhendra Tiwari

    Post:510

    Points:2550
    Q: When the SelectionChanged event gets raised, how do I get the new selection?

    The SelectionChanged event is designed to handle controls that allow multiple selections,
    so it can be a little confusing for a single-selection selector such as ComboBox. The
    SelectionChangedEventArgs type passed to event handlers has two properties of type
    IList: AddedItems and RemovedItems. AddedItems contains the new selection and
    RemovedItems contains the previous selection.

    e.g.
    void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
    if (e.AddedItems.Count > 0)
    object newSelection = e.AddedItems[0];
    }
    Like this code, never assume that there’s a selected item! Besides the fact that ComboBox’s
    selection can be cleared programmatically, it can get cleared by the user when IsEditable is
    true and IsReadOnly is false. In this case, if the user changes the selection box text to
    something that doesn’t match any item, the SelectionChanged event is raised with an
    empty AddedItems collection.

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