C# WinForm 繪製圓角表單

public void SetWindowRegion(){System.Drawing.Drawing2D.GraphicsPath FormPath;FormPath = new System.Drawing.Drawing2D.GraphicsPath();Rectangle rect = new Rectangle(0, 22, this.Width, this.Height - 22);//this.Left-10,this.Top-10,this.Width-10,this.Height-10);    FormPath = GetRoundedRectPath(rect, 30);this.Region = new Region(FormPath);}private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius){int diameter = radius;Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));GraphicsPath path = new GraphicsPath();//   左上方    path.AddArc(arcRect, 180, 90);//   右上方    arcRect.X = rect.Right - diameter;path.AddArc(arcRect, 270, 90);//   右下角    arcRect.Y = rect.Bottom - diameter;path.AddArc(arcRect, 0, 90);//   左下角    arcRect.X = rect.Left;path.AddArc(arcRect, 90, 90);path.CloseFigure();return path;}protected override void OnResize(System.EventArgs e){this.Region = null;SetWindowRegion();}

教你一招:構造圓角表單 
http://topic.csdn.net/t/20041128/19/3596094.html 

增加命名空間:using System.Drawing.Drawing2D; 
添加方法如下:當然各角的點可根據需要確定. 複製  儲存

private void Type(Control sender, int p_1, double p_2){GraphicsPath oPath = new GraphicsPath();oPath.AddClosedCurve(new Point[] {new Point(0, sender.Height / p_1),new Point(sender.Width / p_1, 0),new Point(sender.Width - sender.Width / p_1, 0),new Point(sender.Width, sender.Height / p_1),new Point(sender.Width, sender.Height - sender.Height / p_1),new Point(sender.Width - sender.Width / p_1, sender.Height),new Point(sender.Width / p_1, sender.Height),new Point(0, sender.Height - sender.Height / p_1) },(float) p_2);sender.Region = new Region(oPath);}

在表單的paint和resize事件中增加:Type(this,20,0.1); 
參數20和0.1也可以根據自己的需要調整到最佳效