公共静态的GraphicsPath圆角矩形（矩形范围，INT半径）
 {
 INT直径为半径* 2; 
尺寸大小=新的大小（直径，直径）; 
长方形弧=新的Rectangle（bounds.Location，大小）; 
 GraphicsPath的路径=新的GraphicsPath（）; 

如果（半径== 0）
 {
 path.AddRectangle（边界）; 
返回路径; 
} 

 //左上方弧
 path.AddArc（弧，180，90）; 

 //右上弧
 arc.X = bounds.Right  - 直径; 
 path.AddArc（弧，270，90）; 

 //右下弧
 arc.Y = bounds.Bottom  - 直径; 
 path.AddArc（弧，0，90）; 

 //左下弧
 arc.X = bounds.Left; 
 path.AddArc（弧，90，90）; 

 path.CloseFigure（）; 
返回路径; 
} 
 

和您可以为图形两个扩展方法键入所以你可以用它们作为通常的绘制... 和填充... 形状绘制方法。

 公共静态无效DrawRoundedRectangle（此图形显卡，笔笔，矩形范围，诠释cornerRadius）
 {
如果（图形== NULL）
抛出新的ArgumentNullException（图形）; 
如果（笔== NULL）
抛出新的ArgumentNullException（笔）;使用（GraphicsPath的路径=圆角矩形（边界，cornerRadius））
 {
 graphics.DrawPath（钢笔，路径）

; 
} 
} 

公共静态无效FillRoundedRectangle（此图形显卡，刷刷，矩形范围，诠释cornerRadius）
 {
如果（图形== NULL）
抛出新的ArgumentNullException（图形）; 
如果（刷== NULL）
抛出新的ArgumentNullException（刷）;使用（GraphicsPath的路径=圆角矩形（边界，cornerRadius））
 {
 graphics.FillPath（刷，路径）

; 
} 
} 
 

I am using this code to make a rounded rectangle. But it only draws upper left and right corners of rectanlge , more it doest not complete the rectangle at lower part. How to make it complete and filled . What changes should I make ?

public static Bitmap DrawRoundedRectangle(Bitmap Image, Color BoxColor, int XPosition, int YPosition,
        int Height, int Width, int CornerRadius)
    {
     Bitmap NewBitmap = new Bitmap(Image, Image.Width, Image.Height);
     using (Graphics NewGraphics = Graphics.FromImage(NewBitmap))
    {
        using (Pen BoxPen = new Pen(BoxColor))
        {
            using (GraphicsPath Path = new GraphicsPath())
            {
                   Path.AddLine(XPosition + CornerRadius, YPosition, XPosition + Width - (CornerRadius * 2), YPosition);
                    Path.AddArc(XPosition + Width - (CornerRadius * 2), YPosition, CornerRadius * 2, CornerRadius * 2, 270, 90);
                  Path.AddLine(XPosition + Width, YPosition + CornerRadius, XPosition + Width, YPosition + Height - (CornerRadius * 2));
                    Path.AddArc(XPosition + Width - (CornerRadius * 2), YPosition + Height - (CornerRadius * 2), CornerRadius * 2, CornerRadius * 2, 0, 90);
                 Path.AddLine(XPosition + Width - (CornerRadius * 2), YPosition + Height, XPosition + CornerRadius, YPosition + Height);
                   Path.AddArc(XPosition, YPosition + Height - (CornerRadius * 2), CornerRadius * 2, CornerRadius * 2, 90, 90);
                   Path.AddLine(XPosition, YPosition + Height - (CornerRadius * 2), XPosition, YPosition + CornerRadius);
                    Path.AddArc(XPosition, YPosition, CornerRadius * 2, CornerRadius * 2, 180, 90);
                     Path.CloseFigure();
                     NewGraphics.DrawPath(BoxPen, Path);
                 }
              }
          }
         return NewBitmap;
     }

    public static GraphicsPath RoundedRect(Rectangle bounds, int radius)
    {
        int diameter = radius * 2;
        Size size = new Size(diameter, diameter);
        Rectangle arc = new Rectangle(bounds.Location, size);
        GraphicsPath path = new GraphicsPath();

        if (radius == 0)
        {
            path.AddRectangle(bounds);
            return path;
        }

        // top left arc  
        path.AddArc(arc, 180, 90);

        // top right arc  
        arc.X = bounds.Right - diameter;
        path.AddArc(arc, 270, 90);

        // bottom right arc  
        arc.Y = bounds.Bottom - diameter;
        path.AddArc(arc, 0, 90);

        // bottom left arc 
        arc.X = bounds.Left;
        path.AddArc(arc, 90, 90);

        path.CloseFigure();
        return path;
    }

And you can make two extension methods for the Graphics type so you can use them as the usual Draw... and Fill... shape-drawing methods.

    public static void DrawRoundedRectangle(this Graphics graphics, Pen pen, Rectangle bounds, int cornerRadius)
    {
        if (graphics == null)
            throw new ArgumentNullException("graphics");
        if (pen == null)
            throw new ArgumentNullException("pen");

        using (GraphicsPath path = RoundedRect(bounds, cornerRadius))
        {
            graphics.DrawPath(pen, path);
        }
    }

    public static void FillRoundedRectangle(this Graphics graphics, Brush brush, Rectangle bounds, int cornerRadius)
    {
        if (graphics == null)
            throw new ArgumentNullException("graphics");
        if (brush == null)
            throw new ArgumentNullException("brush");

        using (GraphicsPath path = RoundedRect(bounds, cornerRadius))
        {
            graphics.FillPath(brush, path);
        }
    }