以下代碼均是寫在partial class Form1 : Form{}代碼塊之間，廢話不多說直接上代碼。

第一種方法是通過OnResize方法來實現?

第一種方法 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, 10);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();// 左上角 path.AddArc(arcRect, 180, 90);// 右上角 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(); }

第二種方法是通過Point方法來實現

第二種方法 private SetFormCircle() {int radian = 4; //圓弧角的比率，可以自己改變這個值看具體的效果int w = this.Width; //窗體寬int h = this.Height; //窗體高//對于矩形的窗體，要在一個角上畫個弧度至少需要2個點，所以4個角需要至少8個點Point p1 = new Point(radian, 0);Point p2 = new Point(w - radian, 0);Point p3 = new Point(w, radian);Point p4 = new Point(w, h - radian);Point p5 = new Point(w - radian, h);Point p6 = new Point(radian, h);Point p7 = new Point(0, h - radian);Point p8 = new Point(0, radian);System.Drawing.Drawing2D.GraphicsPath shape = new System.Drawing.Drawing2D.GraphicsPath();Point[] p = new Point[] { p1, p2, p3, p4, p5, p6, p7, p8 };shape.AddPolygon(p);//將窗體的顯示區域設為GraphicsPath的實例this.Region = new System.Drawing.Region(shape); } private void Form1_Load(object sender, EventArgs e) {SetFormCircle(); }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); } //備注：在窗體的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果)

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轉載于:https://www.cnblogs.com/zxin/archive/2012/12/07/2806406.html

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