C# 开发圆角控件(窗体)

最近在做卡片视图的程序，要求将控件做成带有圆角的效果，下面是我在网上查找的资料，经过测试，确定可以实现功能。其中方法三既适应于控件，也适应于窗体。

先上传效果图：

方法一：

增加命名空间:usingSystem.Drawing.Drawing2D;添加方法如下:当然各角的点可根据需要确定.

 1 PRivate void Type(Control sender, int p_1, double p_2) 2         { 3             GraphicsPath oPath = new GraphicsPath(); 4             oPath.AddClosedCurve( 5                 new Point[] { 6             new Point(0, sender.Height / p_1), 7             new Point(sender.Width / p_1, 0),  8             new Point(sender.Width - sender.Width / p_1, 0),  9             new Point(sender.Width, sender.Height / p_1),10             new Point(sender.Width, sender.Height - sender.Height / p_1), 11             new Point(sender.Width - sender.Width / p_1, sender.Height), 12             new Point(sender.Width / p_1, sender.Height),13             new Point(0, sender.Height - sender.Height / p_1) },14 15                 (float)p_2);16 17             sender.Region = new Region(oPath);18         }

在窗体的paint和resize事件中增加:Type(this,20,0.1);参数20和0.1也可以根据自己的需要调整到最佳效

方法二：

 1 public void SetWindowRegion() 2         { 3  4             System.Drawing.Drawing2D.GraphicsPath FormPath; 5  6             FormPath = new System.Drawing.Drawing2D.GraphicsPath(); 7  8             Rectangle rect = new Rectangle(0, 22, this.Width, this.Height - 22);//this.Left-10,this.Top-10,this.Width-10,this.Height-10);                  9 10             FormPath = GetRoundedRectPath(rect, 30);11 12             this.Region = new Region(FormPath);13 14         }15 16         private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)17         {18 19             int diameter = radius;20 21             Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));22 23             GraphicsPath path = new GraphicsPath();24 25             //   左上角   26 27             path.AddArc(arcRect, 180, 90);28 29             //   右上角   30 31             arcRect.X = rect.Right - diameter;32 33             path.AddArc(arcRect, 270, 90);34 35             //   右下角   36 37             arcRect.Y = rect.Bottom - diameter;38 39             path.AddArc(arcRect, 0, 90);40 41             //   左下角   42 43             arcRect.X = rect.Left;44 45             path.AddArc(arcRect, 90, 90);46 47             path.CloseFigure();48 49             return path;50 51         }

在窗体的resize事件中增加:SetWindowRegion();

方法三：通过Window系统API行数，修改控件和窗体为椭圆形状。代码如下所示：

 1 [System.Runtime.InteropServices.DllImport("gdi32")] 2         private static extern IntPtr BeginPath(IntPtr hdc); 3         [System.Runtime.InteropServices.DllImport("gdi32")] 4         private static extern int SetBkMode(IntPtr hdc, int nBkMode); 5         const int TRANSPARENT = 1; 6         [System.Runtime.InteropServices.DllImport("gdi32")] 7         private static extern IntPtr EndPath(IntPtr hdc); 8         [System.Runtime.InteropServices.DllImport("gdi32")] 9         private static extern IntPtr PathToRegion(IntPtr hdc);10         [System.Runtime.InteropServices.DllImport("gdi32")]11         private static extern int Ellipse(IntPtr hdc, int x1, int y1, int x2, int y2);12         [System.Runtime.InteropServices.DllImport("user32")]13         private static extern IntPtr SetWindowRgn(IntPtr hwnd, IntPtr hRgn, bool bRedraw);14         [System.Runtime.InteropServices.DllImport("user32")]15         private static extern IntPtr GetDC(IntPtr hwnd);

 1 protected override void OnPaint(PaintEventArgs e) 2         { 3             base.OnPaint(e); 4  5             IntPtr dc; 6             IntPtr region; 7  8             dc = GetDC(this.Handle); 9             BeginPath(dc);10             SetBkMode(dc, TRANSPARENT);11             Ellipse(dc, 0, 0, this.Width - 3, this.Height - 2);12             EndPath(dc);13             region = PathToRegion(dc);14             SetWindowRgn(this.Handle, region, false);15         }