先看下效果
纯透明的pane，然后设置一个半透明的图片，可以看出来显示了父控件的button
看代码
代码语言：javascript复制 public partial class PanelEx : Panel
{
protected Graphics graphics;
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00000020; // 实现透明样式
return cp;
}
}
public PanelEx()
{
InitializeComponent();
this.BackColor = Color.Transparent;
this.ForeColor = Color.Transparent;
}
protected override void OnPaintBackground(PaintEventArgs pevent)
{
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
this.graphics = e.Graphics;
this.graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
this.graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
this.graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
this.graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
this.graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
if (this.BackgroundImage != null)
{
int width = this.Width;
int height = this.Height;
Rectangle recModel = new Rectangle(0, 0, width, height);
this.graphics.DrawImage(this.BackgroundImage, recModel);
}
else if (this.ForeColor != Color.Transparent)
{
this.graphics.Clear(this.ForeColor);
}
}
}
