winform中真正的透明label

 1 public partial class transparentLabel : UserControl
 2     {
 3         public transparentLabel()
 4         {
 5             InitializeComponent();
 6             SetStyle(ControlStyles.SupportsTransparentBackColor
 7               | ControlStyles.UserPaint
 8               | ControlStyles.AllPaintingInWmPaint
 9               | ControlStyles.Opaque, true);
10             this.BackColor = Color.Transparent;
11         }
12         protected override CreateParams CreateParams
13         {
14             get
15             {
16                 CreateParams cp = base.CreateParams;
17                 cp.ExStyle |= 0x00000020; //WS_EX_TRANSPARENT 
18                 return cp;
19             }
20 
21         }
22     }