Question

C#中怎么重写button让button显示为圆形

高分请高手，

Answer 1

using System;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace WindowsApplication1
{
/// <summary>
/// Summary description for cilpButton.
/// </summary>
public class cilpButton : System.Windows.Forms.Button
{
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
base.OnPaint(e);
System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
path.AddEllipse(0,0, this.Width, this.Height);
this.Region = new Region(path);
}

protected override void OnMouseEnter(EventArgs e)
{
Graphics g = this.CreateGraphics();
g.DrawEllipse(new Pen(Color.Red), 0, 0 , this.Width, this.Height);
g.Dispose();
}
protected override void OnMouseLeave(EventArgs e)
{
Graphics g = this.CreateGraphics();
g.DrawEllipse(new Pen(this.BackColor), 0, 0 , this.Width, this.Height);
g.Dispose();
}

protected override void OnPaintBackground(PaintEventArgs pevent)
{
Pen pen = new Pen(this.BackColor);
Graphics g = this.CreateGraphics();
g.Clear(Color.Goldenrod);
g.FillEllipse(Brushes.DarkKhaki, new Rectangle(0,0, this.Width, this.Height));
}

protected override void OnMouseDown(MouseEventArgs e)
{
OnPaintBackground(null);
}
protected override void OnMouseUp(MouseEventArgs e)
{
this.OnClick(e);//响应click事件.
}
}
}