使用C#选择列表框中的项目

<ListBox x:Name="listBox" Width="100" Height="100">
    <ListBoxItem Content="Item 1"/>
    <ListBoxItem Content="Item 2"/>
    <ListBoxItem Content="Item 3"/>
</ListBox><Button x:Name="button" Content="Get Selected Item" Click="button_Click"/>

private void button_Click(object sender, RoutedEventArgs e)
{
    if (listBox.SelectedIndex != -1)
    {
        // 使用 SelectedIndex 获取选定项目
        ListBoxItem selectedItem = listBox.Items[listBox.SelectedIndex] as ListBoxItem;
        MessageBox.Show("Selected item using SelectedIndex: " + selectedItem.Content);

        // 使用 SelectedItem 获取选定项目
        selectedItem = listBox.SelectedItem as ListBoxItem;
        MessageBox.Show("Selected item using SelectedItem: " + selectedItem.Content);
    }
    else
    {
        MessageBox.Show("No item selected.");
    }
}