[C#关于绘制透明控件的求助]

设计视图

代码：

public MyTransparentControl()
        {
            InitializeComponent();
           
            SetStyle(ControlStyles.SupportsTransparentBackColor

              | ControlStyles.UserPaint

              | ControlStyles.AllPaintingInWmPaint

              | ControlStyles.Opaque, true);

 
            base.CreateControl();
            
            this.BringToFront();
        }

protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            for (int i = 0; i < this.Width; i += 100)//画线
            {
                e.Graphics.DrawLine(new Pen(Color.Gray), new Point(i + 50, 0), new Point(i, this.Height - 1));
            }
        }

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                
                cp.Style |= 0x00000020;
                //WS_EX_TRANSPARENT 
 

                return cp;
            }
        }

运行时：

后面就是桌面……

为啥我不能实现这个效果：

虚心求大神解答。 没人知道？
同3楼 看法
[解决办法]
class TransparentControl:Control
{
protected override CreateParams CreateParams
{
get
{
CreateParams para = base.CreateParams;
para.ExStyle
[解决办法]
= 0x00000020; //WS_EX_TRANSPARENT 透明支持
return para;
}
}
protected override void OnPaintBackground(PaintEventArgs e) //不画背景
{
//base.OnPaintBackground(e);
}
protected override OnPaint(PaintEventArgs e)

{
//绘制图形
}
}