場景

在右鍵菜單ContextMenuStrip下添加子菜單選項可以通過

ContextMenuStrip menuStrip
ToolStripMenuItem mnuChartOption = new ToolStripMenuItem();     //新建菜單項對象
mnuChartOption.Name = "chart_option";
mnuChartOption.Text = "圖形選項";
//點擊彈出圖形選項對話框
mnuChartOption.Click += delegate(object sender, EventArgs e)
   {
                
    };
menuStrip.Items.Add(mnuChartOption);

來實現。但是如果在右鍵菜單的子菜單選項下再添加子菜單選項，形成二級子菜單。

註：

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https://blog.csdn.net/badao_liumang_qizhi
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實現

ToolStripMenuItem 的子級菜單仍然是ToolStripMenuItem ，主要通過DropDownItems屬性來構建關聯關係。

構建右鍵二級子菜單示例代碼

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

            ToolStripMenuItem mnuPrintPageSet = new ToolStripMenuItem("列印頁面設置");
            mnuPrintPageSet.Name = "printPageSet";
            mnuPrintPageSet.Text = "列印頁面設置";
            mnuPrintPageSet.Click += delegate(object sender, EventArgs e)
            {
                control.DoPageSetup();
            };

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

            
            menuStrip.Items.Add(mnuPrint);

效果