Selector.SelectedIndex Property

Reference

Definition

Namespace:: System.Windows.Controls.Primitives

Assembly:: PresentationFramework.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the index of the first item in the current selection or returns negative one (-1) if the selection is empty.

public:
 property int SelectedIndex { int get(); void set(int value); };

[System.ComponentModel.Bindable(true)]
[System.Windows.Localizability(System.Windows.LocalizationCategory.NeverLocalize)]
public int SelectedIndex { get; set; }

[<System.ComponentModel.Bindable(true)>]
[<System.Windows.Localizability(System.Windows.LocalizationCategory.NeverLocalize)>]
member this.SelectedIndex : int with get, set

Public Property SelectedIndex As Integer

Property Value

Int32

The index of first item in the current selection. The default value is negative one (-1).

Attributes: BindableAttribute LocalizabilityAttribute

Examples

The following example creates a ListBox and sets the SelectedIndex property to 1, which selects the second item in the ListBox.

<ListBox Margin="10,0,0,5" SelectedIndex="1"
  Name="listBox1" VerticalAlignment="Top" Grid.Column="0" Grid.Row="4">
  <ListBoxItem>Item 0</ListBoxItem>
  <ListBoxItem>Item 1</ListBoxItem>
  <ListBoxItem>Item 2</ListBoxItem>
  <ListBoxItem>Item 3</ListBoxItem>
</ListBox>

The following example uses the SelectedIndex property to determine whether the item at index 0 is the first item in the selection.

if (lb.SelectedIndex == 0)
{
    Item.Content = "Index 0";
}

If lb.SelectedIndex = 0 Then
    Item.Content = "Index 0"

Remarks

If a Selector supports selecting a single item, the SelectedIndex property returns the index of the selected item. If a Selector supports multiple selections, SelectedIndex returns the index of the item that the user selected first.

Setting SelectedIndex in a Selector that supports multiple selections clears existing selected items and sets the selection to the item specified by the index. SelectedIndex returns -1 if selection is empty.

If you set SelectedIndex to a value less that -1, an ArgumentException is thrown. If you set SelectedIndex to a value equal or greater than the number of child elements, the value is ignored.

Dependency Property Information


Identifier field	SelectedIndexProperty
Metadata properties set to `true`	BindsTwoWayByDefault, Journal

Applies to

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