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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
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); } } }
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