winform中的透明都是假透明，只是将背景色设置为父级容器的背景色。所以从网上找到这个真正透明的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 CreateParams13         {14             get15             {16                 CreateParams cp = base.CreateParams;17                 cp.ExStyle |= 0x00000020; //WS_EX_TRANSPARENT 18                 return cp;19             }20 21         }22     }