给GroupBox动态添加一个按钮，实现展开和折叠功能

需求：最近项目里有一个Winfrom工具需要扩展，然后就找到了我，我完成了一个页面数据太多的下拉滚动和折叠等功能

主要：谈谈怎么动态给GroupBox新增一个按钮吧

代码实现

        /// <summary>设置GroupBox添加伸展按钮
        /// xun-yu.she|2020-08-05
        /// </summary>
        /// <param name="gb"></param>
        public static void SetGroupBoxAddButtonExtend(this GroupBox gb)
        {
            var btnGroupBox = new Button();
            btnGroupBox.Text = "折叠";
            btnGroupBox.Click += new EventHandler(btnGroupBox_Click);
            btnGroupBox.Size = new System.Drawing.Size(42, 22);
            btnGroupBox.UseVisualStyleBackColor = true;
            btnGroupBox.Tag = gb;
            btnGroupBox.Top = 10;
            btnGroupBox.Left = gb.Width - 70;
            btnGroupBox.BringToFront();
            gb.Controls.Add(btnGroupBox);
        }
        static void btnGroupBox_Click(object sender, EventArgs e)
        {
            var btnGroupBox = sender as Button;
            if (btnGroupBox.Tag != null)
            {
                var groupBox = btnGroupBox.Tag as GroupBox;
                if (btnGroupBox.Text == "展开")
                {
                    btnGroupBox.Text = "折叠";
                    groupBox.Height = Convert.ToInt32(groupBox.Tag);
                }
                else
                {
                    if (groupBox.Tag == null)
                    {
                        groupBox.Tag = groupBox.Height;
                    }
                    btnGroupBox.Text = "展开";
                    groupBox.Height = Convert.ToInt32(50);
                }
            }


        }

总结：我来说下思路，就比如页面上有多个GroupBox，我进行Dock设定Top，然后多个GroupBox就会相邻在一起。然后如果我GroupBox有需要展开按钮我就调用扩张方法，该方法会根据我的默认动态新增一个按钮在GroupBox右上角，然后通过点击可以实现展开和折叠效果，有需要深入交流可以联系我微信