1.代码结构

2.实现代码

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;namespace WinFormBeautyButtonDemo
{/// <summary>///     WinForm自制水晶按钮（很漂亮）///     LDH @ 2019-7-18/// </summary>public sealed partial class BeautyButton : Button{/// <summary>///     定义一个位图/// </summary>private Bitmap _btnbmp;/// <summary>///     定义一个矩形/// </summary>private Rectangle _btnrc;private MouseActionType _mouseActionType;public BeautyButton(){InitializeComponent();_mouseActionType = MouseActionType.None;SetStyle(ControlStyles.AllPaintingInWmPaint | // 禁止擦除背景ControlStyles.DoubleBuffer | // 双缓冲ControlStyles.UserPaint, true);// 下面这些可以不设置,也可以自己定义Font = new Font("微软雅黑", 12, FontStyle.Bold);BackColor = Color.DarkTurquoise;Size = new Size(112, 48);}/// <summary>///     按钮形状/// </summary>/// <param name="rc">按钮的坐标和大小</param>/// <param name="r">按钮圆弧的半径</param>/// <returns>返回按钮形状</returns>private GraphicsPath GetGraphicsPath(Rectangle rc, int r){int x = rc.X, y = rc.Y, w = rc.Width, h = rc.Height;var path = new GraphicsPath();path.AddArc(x, y, r, r, 180, 90); // 左上角圆弧path.AddArc(x + w - r, y, r, r, 270, 90); // 右上角圆弧path.AddArc(x + w - r, y + h - r, r, r, 0, 90); // 右下角圆弧path.AddArc(x, y + h - r, r, r, 90, 90); // 左下角圆弧path.CloseFigure(); // 闭合return path;}protected override void OnPaint(PaintEventArgs pe){// base.OnPaint(pe);var g = pe.Graphics; // 创建画布g.Clear(SystemColors.ButtonFace); // 重置背景颜色,可以自定义var clr = BackColor;var btnOff = 0; // 按钮边距var shadowOff = 0; // 阴影边距switch (_mouseActionType){case MouseActionType.None:break;case MouseActionType.Hover:clr = Color.LightGray;break;case MouseActionType.Click:shadowOff = 4;clr = Color.LightGray;btnOff = 2;break;}g.SmoothingMode = SmoothingMode.AntiAlias; // 消除锯齿// 创建按钮本身的图形var rc1 = new Rectangle(btnOff, btnOff, ClientSize.Width - 8 - btnOff, ClientSize.Height - 8 - btnOff);var path1 = GetGraphicsPath(rc1, 20);var br1 = new LinearGradientBrush(new Point(0, 0), new Point(0, rc1.Height + 6), clr, Color.White);// 创建按钮阴影var rc2 = rc1;rc2.Offset(shadowOff, shadowOff);var path2 = GetGraphicsPath(rc2, 20);var br2 = new PathGradientBrush(path2){CenterColor = Color.Black, SurroundColors = new[] {SystemColors.ButtonFace}};// 为了更逼真，我们将渐变结束颜色设定为窗体前景色，可以根据窗口的前景颜色适当调整// 创建按钮顶部白色渐变var rc3 = rc1;rc3.Inflate(-5, -5);rc3.Height = 15;var path3 = GetGraphicsPath(rc3, 20);var br3 = new LinearGradientBrush(rc3, Color.FromArgb(255, Color.White), Color.FromArgb(0, Color.White),LinearGradientMode.Vertical);// 绘制图形g.FillPath(br2, path2); // 绘制阴影g.FillPath(br1, path1); // 绘制按钮g.FillPath(br3, path3); // 绘制顶部白色泡泡// 设定内存位图对象，进行二级缓存绘图操作_btnrc = new Rectangle(rc1.Location, rc1.Size);_btnbmp = new Bitmap(_btnrc.Width, _btnrc.Height);var gBmp = Graphics.FromImage(_btnbmp);gBmp.SmoothingMode = SmoothingMode.AntiAlias;gBmp.FillPath(br1, path1);gBmp.FillPath(br3, path3);// 将region赋值给buttonvar rgn = new Region(path1);rgn.Union(path2);Region = rgn;// 绘制按钮的文本var path4 = new GraphicsPath();var path1Bounds = path1.GetBounds();var rcText = new Rectangle((int) path1Bounds.X + btnOff, (int) path1Bounds.Y + btnOff,(int) path1Bounds.Width,(int) path1Bounds.Height);var strFormat = new StringFormat{Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center};// 横竖都居中path4.AddString(Text, Font.FontFamily, (int) Font.Style, Font.Size, rcText, strFormat);var txtPen = new Pen(ForeColor, 1);g.DrawPath(txtPen, path4);gBmp.DrawPath(txtPen, path4);}protected override void OnMouseDown(MouseEventArgs eventArgs){if (eventArgs.Button == MouseButtons.Left){_mouseActionType = MouseActionType.Click;Invalidate();}base.OnMouseDown(eventArgs);}protected override void OnMouseUp(MouseEventArgs eventArgs){_mouseActionType = MouseActionType.Hover;Invalidate();base.OnMouseUp(eventArgs);}protected override void OnMouseHover(EventArgs e){_mouseActionType = MouseActionType.Hover;Invalidate();base.OnMouseHover(e);}protected override void OnMouseEnter(EventArgs e){_mouseActionType = MouseActionType.Hover;Invalidate();base.OnMouseEnter(e);}/// <summary>///     鼠标离开事件/// </summary>/// <param name="e"></param>protected override void OnMouseLeave(EventArgs e){_mouseActionType = MouseActionType.None;Invalidate();base.OnMouseLeave(e);}private enum MouseActionType{None,Hover,Click}}
}

3.运行效果