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SelectedIndex Property

Selector.SelectedIndex Property

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

Namespace:  System.Windows.Controls.Primitives
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

[BindableAttribute(true)]
[LocalizabilityAttribute(LocalizationCategory.NeverLocalize)]
public int SelectedIndex { get; set; }
<object SelectedIndex="int" .../>

Property Value

Type: System.Int32
The index of first item in the current selection. The default value is negative one (-1).

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.

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";
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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