C # developing a rounded corner control (form)

Recently, I am working on the card view program, which requires that the control be made with rounded corners. below is the information I searched online. After testing, I confirmed that the function can be implemented. Method 3 is applicable to both controls and forms.

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Method 1:

Add namespace: using System. Drawing. Drawing2D;
The method is as follows: Of course, the points of each angle can be determined as needed.

   Type(Control sender,  p_1,               GraphicsPath oPath =                                 Point(, sender.Height /              Point(sender.Width / p_1,               Point(sender.Width - sender.Width / p_1,               Point(sender.Width, sender.Height /              Point(sender.Width, sender.Height - sender.Height /              Point(sender.Width - sender.Width /              Point(sender.Width /              Point(, sender.Height - sender.Height /                  (              sender.Region =          }

Add: Type (this, 20, 0.1) to the form paint and resize events );
Parameters 20 and 0.1 can also be adjusted to the best effect as needed

 

Method 2:

                   FormPath =               Rectangle rect =  Rectangle(, , .Width, .Height - );              FormPath = GetRoundedRectPath(rect,               .Region =              GraphicsPath GetRoundedRectPath(Rectangle rect,                 diameter =              Rectangle arcRect =  Rectangle(rect.Location,               GraphicsPath path =                             path.AddArc(arcRect, ,                             arcRect.X = rect.Right -              path.AddArc(arcRect, ,                             arcRect.Y = rect.Bottom -              path.AddArc(arcRect, ,                             arcRect.X =              path.AddArc(arcRect, ,                           }

Add SetWindowRegion () in the resize event of the form ();

Method 3: Use the number of API lines in the Window system to modify the control and form to an elliptical shape. The Code is as follows:

 [System.Runtime.InteropServices.DllImport(                    [System.Runtime.InteropServices.DllImport(             SetBkMode(IntPtr hdc,            TRANSPARENT =          [System.Runtime.InteropServices.DllImport(                    [System.Runtime.InteropServices.DllImport(                    [System.Runtime.InteropServices.DllImport(             Ellipse(IntPtr hdc,  x1,  y1,  x2,          [System.Runtime.InteropServices.DllImport(            IntPtr SetWindowRgn(IntPtr hwnd, IntPtr hRgn,          [System.Runtime.InteropServices.DllImport(            IntPtr GetDC(IntPtr hwnd);

                                  dc = GetDC(               Ellipse(dc, , , .Width - , .Height -               region =             SetWindowRgn(.Handle, region,          }