C#中怎样在ToolStripMenuItem下再添加子级菜单

场景

在右键菜单ContextMenuStrip下添加子菜单选项可以通过

ContextMenuStrip menuStrip
ToolStripMenuItem mnuChartOption = new ToolStripMenuItem();     //新建菜单项对象
mnuChartOption.Name = "chart_option";
mnuChartOption.Text = "图形选项";
//点击弹出图形选项对话框
mnuChartOption.Click += delegate(object sender, EventArgs e)
   {
                
    };
menuStrip.Items.Add(mnuChartOption);

来实现。但是如果在右键菜单的子菜单选项下再添加子菜单选项，形成二级子菜单。

注：

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实现

ToolStripMenuItem 的子级菜单仍然是ToolStripMenuItem ，主要通过DropDownItems属性来构建关联关系。

构建右键二级子菜单示例代码

     ToolStripMenuItem mnuDirectPrint = new ToolStripMenuItem("直接打印");
            mnuDirectPrint.Name = "directPrint";
            mnuDirectPrint.Text = "直接打印";
            mnuDirectPrint.Click += delegate(object sender, EventArgs e)
            {
                control.DoPrint();
            };

            ToolStripMenuItem mnuPrintPageSet = new ToolStripMenuItem("打印页面设置");
            mnuPrintPageSet.Name = "printPageSet";
            mnuPrintPageSet.Text = "打印页面设置";
            mnuPrintPageSet.Click += delegate(object sender, EventArgs e)
            {
                control.DoPageSetup();
            };

            ToolStripMenuItem mnuPrint = new ToolStripMenuItem();
            mnuPrint.Name = "mnuPrint";
            mnuPrint.Text = "打印";
            mnuPrint.DropDownItems.Add(mnuDirectPrint);
            mnuPrint.DropDownItems.Add(mnuPrintPageSet);

            
            menuStrip.Items.Add(mnuPrint);

效果