HOW TO：取得 ListBoxItem

如果您需要取得位於 ListBox 中特定索引處的特定 ListBoxItem，可以使用 ItemContainerGenerator。

範例

下列範例顯示 ListBox 及其項目。

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

下列範例示範如何在 ItemContainerGenerator 的 ContainerFromIndex 屬性中指定項目的索引，以便擷取該項目。

Private Sub GetIndex0(ByVal Sender As Object, ByVal e As RoutedEventArgs)

    Dim lbi As ListBoxItem = CType( _
        lb.ItemContainerGenerator.ContainerFromIndex(0), ListBoxItem)
    Item.Content = "The contents of the item at index 0 are: " + _
        (lbi.Content.ToString()) + "."
End Sub

private void GetIndex0(object sender, RoutedEventArgs e)
{
  ListBoxItem lbi = (ListBoxItem)
      (lb.ItemContainerGenerator.ContainerFromIndex(0));
  Item.Content = "The contents of the item at index 0 are: " +
      (lbi.Content.ToString()) + ".";
}

擷取清單方塊項目之後，您就可以顯示項目的內容，如下列範例所示。

Item.Content = "The contents of the item at index 0 are: " + _
    (lbi.Content.ToString()) + "."

Item.Content = "The contents of the item at index 0 are: " +
    (lbi.Content.ToString()) + ".";