如何允许用户编辑ListBox中的项目？

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (listBox1.SelectedIndex != -1)
    {
        textBox1.Text = listBox1.SelectedItem.ToString();
    }
}

private void textBox1_TextChanged(object sender, EventArgs e)
{
    if (listBox1.SelectedIndex != -1)
    {
        listBox1.Items[listBox1.SelectedIndex] = textBox1.Text;
    }
}

<ListBox x:Name="listBox" SelectionChanged="listBox_SelectionChanged">
    <ListBoxItem>Item 1</ListBoxItem>
    <ListBoxItem>Item 2</ListBoxItem>
    <ListBoxItem>Item 3</ListBoxItem>
</ListBox><TextBox x:Name="textBox" TextChanged="textBox_TextChanged" />

private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (listBox.SelectedIndex != -1)
    {
        textBox.Text = listBox.SelectedItem.ToString();
    }
}

private void textBox_TextChanged(object sender, TextChangedEventArgs e)
{
    if (listBox.SelectedIndex != -1)
    {
        listBox.Items[listBox.SelectedIndex] = textBox.Text;
    }
}