C#如何实现自定义圆角按钮

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Winform中自带的button没有圆角属性，所以我们继承Button类，重写OnPaint事件来绘制圆角按钮。

1.绘制圆角按钮框需要用到系统自带的绘制方法：首先引入Gdi32.dll中的CreateRoundRectRgn方法。经过验证此方法在大量控件情况下使用，会导致GDI+绘图问题！现在改用自己绘制的圆角GraphicsPath进行填充显示，效果更好，圆角更圆润了！

重写OnPaint方法：

protected override void OnPaint(PaintEventArgs pe)        {            if (!roundCorner)            {                base.OnPaint(pe);                return;            }            Graphics g = pe.Graphics;            g.SmoothingMode = SmoothingMode.AntiAlias;            //g.SmoothingMode = SmoothingMode.HighQuality;            //g.CompositingQuality = CompositingQuality.HighQuality;            //g.InterpolationMode = InterpolationMode.HighQualityBicubic;            Rectangle rect = this.ClientRectangle;            Brush brhBorder = new SolidBrush(crBorderPainting);            Brush brhRect = new SolidBrush(BackColor);            Brush b0 = new SolidBrush(this.Parent.BackColor);            Brush bfont = new SolidBrush(ForeColor);            try            {                g.Clear(this.Parent.BackColor);                int borderSize = FlatAppearance.BorderSize;                try                {                    GraphicsPath path = CreateRoundRect(rect.Left, rect.Top, rect.Left + rect.Width - borderSize, rect.Top + rect.Height - borderSize);                    g.FillPath(brhBorder, path);                    path.Dispose();                    path = CreateRoundRect(rect.Left + borderSize /2f, rect.Top + borderSize / 2f, rect.Left + rect.Width - borderSize * 2, rect.Top + rect.Height - borderSize * 2);                    g.FillPath(brhRect, path);                    path.Dispose();                }                catch (Exception e)                {                    Console.WriteLine("FillPath:" + e.Message);                }                if (this.Text != string.Empty)                {                    StringFormat sf = StringFormat.GenericTypographic;                    sf.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;                    SizeF sizeoftext = g.MeasureString(this.Text, Font);                    float tx = (float)((this.Width - sizeoftext.Width) / 2.0);                    float ty = (float)((this.Height - sizeoftext.Height) / 2.0);                    g.DrawString(this.Text, Font, bfont, tx, ty);                }            }            finally            {                b0.Dispose();                brhBorder.Dispose();                brhRect.Dispose();                bfont.Dispose();            }        }

private GraphicsPath CreateRoundRect(float rleft, float rtop, float rwidth, float rheight)        {            float r = radius;            if (rwidth < rheight)            {                if (radius > rwidth / 2f)                    r = rwidth / 2f;            }            else            {                if (radius > rheight / 2f)                    r = rheight / 2f;            }            GraphicsPath path;            RectangleF rectRow = new RectangleF(rleft, rtop + r, rwidth, rheight - r * 2);            RectangleF rectColumn = new RectangleF(rleft + r, rtop, rwidth - r * 2, rheight);            path = new GraphicsPath(FillMode.Winding);            path.AddRectangle(rectRow);            path.AddRectangle(rectColumn);            //左上            path.AddEllipse(rleft, rtop, r * 2, r * 2);            //右上            path.AddEllipse(rleft + rwidth - r * 2, rtop, r * 2, r * 2);            //左下            path.AddEllipse(rleft, rtop + rheight - r * 2, r * 2, r * 2);            //右下            path.AddEllipse(rleft + rwidth - r * 2, rtop + rheight - r * 2, r * 2, r * 2);            return path;        }

2.如果需要增加悬浮效果，可以重写OnMouseEnter、OnMouseLeave事件来改变边界及背景色。

private Color crBorderActive = Color.FromArgb(Convert.ToInt32("FF3283C4", 16));private Color crRectActive = Color.FromArgb(Convert.ToInt32("FFE3F3FB", 16));private Color crBorderDefault = Color.FromArgb(215, 215, 215);protected override void OnMouseEnter(EventArgs e)        {            base.OnMouseEnter(e);            this.BackColor = crRectActive;            this.FlatAppearance.BorderColor = crBorderActive;        }        protected override void OnMouseLeave(EventArgs e)        {            base.OnMouseLeave(e);            this.BackColor = Color.White;            this.FlatAppearance.BorderColor = crBorderDefault;        }

至此一个圆角按钮就完成了^_^。效果如下：

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