winform折叠菜单

布局：

实际效果：

代码部分：

private static int showPanelCount = 2; //需要展示的面板数量
private List<Control> settingPanels;

public DpRight()
{
    InitializeComponent();
}

private void DpLeft_Load(object sender, EventArgs e)
{

    //侧边栏折叠按钮事件
    settingPanels = new List<Control>();

    var cons = this.SettingPanel.Controls;
    for (int i = cons.Count - 1, j = 0; i >= 0; i--)
    {
        var con = cons[i];

        if (con is Button)
        {
            con.MouseClick += Button_MouseClick;
            con.Tag = $"{j}";

            j++;
        }
        else if (con is Panel)
        {
            if (j <= showPanelCount)
                con.Visible = true;
            else
                con.Visible = false;

            settingPanels.Add(con);
        }
    }

}

        private void Button_MouseClick(object sender, MouseEventArgs e)
        {
            Button btn = sender as Button;
            int index = Convert.ToInt32(btn.Tag.ToString());

            //打开当前按钮对应面板，其他关闭
            for (int i = 0; i < settingPanels.Count; i++)
            {
                Panel panel = settingPanels[i] as Panel;
                if (i == index)
                {         
                    panel.Visible = !panel.Visible;
                }
                else
                {
                    panel.Visible = false;
                }
            }

        }