在用户选择时更改标签的边框颜色

Question

当用户选择他想要的颜色时，我想更改标签的边框颜色。我知道标签的绘制事件可以改变边框颜色。我只想要这段代码：

private void label1_Paint(object sender, PaintEventArgs e)
{
    ControlPaint.DrawBorder(e.Graphics, label1.DisplayRectangle, Color.Blue, ButtonBorderStyle.Solid);
}

继续工作：

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
      if (comboBox1.SelectedIndex == 0)
      {
           //apply red color
      }
}

要应用的组合框的选定索引（用户想要的颜色）。我只是不知道该怎么做。

Answer 1

Color selectedColor;

private void label1_Paint(object sender, PaintEventArgs e)
{
    base.OnPaint(e);
    ControlPaint.DrawBorder(e.Graphics, label1.DisplayRectangle, selectedColor, ButtonBorderStyle.Solid);
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (comboBox1.SelectedIndex == 0)
    {
        selectedColor = Color.Red;         
    }
    if (comboBox1.SelectedIndex == 1)
    {
        selectColor = Color.Blue;
    }
    label1.Invalidate();
    label1.Update();
}