我有3个文件夹，其中包含一堆子文件夹和文件。我需要创建一个ContextMenuStrip，所有的文件夹和文件作为ToolStripMenuItems（作为一个树层次结构）。我知道如何硬编码它：

public class CustomApplicationContext : ApplicationContext
    {
        private NotifyIcon trayIcon;
        private ContextMenuStrip contextMenuStrip = new ContextMenuStrip();
        ToolStripMenuItem option1 = new ToolStripMenuItem("Option 1");
        ToolStripMenuItem option1a = new ToolStripMenuItem("Option 1a");
        ToolStripMenuItem option1b = new ToolStripMenuItem("Option 1b");
        ToolStripMenuItem option1c = new ToolStripMenuItem("Option 1c");
        ToolStripMenuItem option1ca = new ToolStripMenuItem("Option 1ca");
        ToolStripMenuItem option2 = new ToolStripMenuItem("Option 2");
        ToolStripMenuItem option3 = new ToolStripMenuItem("Option 3");
        ToolStripMenuItem option4 = new ToolStripMenuItem("Option 4");

        public CustomApplicationContext()
        {
            contextMenuStrip.Items.AddRange(new ToolStripItem[]
            {
                this.option1,
                this.option2,
                this.option3,
                this.option4
            });
            this.option1.DropDownItems.AddRange(new ToolStripItem[]
            {
                this.option1a,
                this.option1b,
                this.option1c
            });
            this.option1c.DropDownItems.AddRange(new ToolStripItem[] 
            {
                this.option1ca
            });
            trayIcon = new NotifyIcon()
            {
                Icon = Resources.AppIcon,
                ContextMenuStrip = contextMenuStrip,
                Visible = true
            };
        }
    }

然而，我想让它更动态，所以如果在其中一个文件夹内的东西改变，它也将动态改变。
我怎么能做到呢？