if ((e.State & TreeNodeStates.Selected) != 0){ //演示為綠底白字 e.Graphics.FillRectangle(Brushes.DeepSkyBlue, e.Node.Bounds); Font nodeFont = e.Node.NodeFont; if (nodeFont == null) nodeFont = ((TreeView)sender).Font; e.Graphics.DrawString(e.Node.Text, nodeFont, Brushes.White, Rectangle.Inflate(e.Bounds, 2, 0));}else{ e.DrawDefault = true;}if ((e.State & TreeNodeStates.Focused) != 0){ using (Pen focusPen = new Pen(Color.Black)) {  focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;  Rectangle focusBounds = e.Node.Bounds;  focusBounds.Size = new Size(focusBounds.Width - 1,  focusBounds.Height - 1);  e.Graphics.DrawRectangle(focusPen, focusBounds); }}