C#实现让ListBox适应最大Item宽度的方法

private void button1_Click(object sender, EventArgs e)
{
 for (int i = 1; i <= 16; i++)
 {
  listBox1.Items.Add("TTTTTTTTTTTTTTTTTTTTTTTTTTTTT" + i.ToString());
 }
}
private void button2_Click(object sender, EventArgs e)
{
 SizeF size = listBox1.CreateGraphics().
 MeasureString(listBox1.Items[0].ToString(), listBox1.Font);
 MessageBox.Show(Convert.ToInt32(size.Width).ToString());
 listBox1.Width = Convert.ToInt32(size.Width)+20;
}