我有一個(gè) Richtextbox 和 ContextMenuStrip，它們可以剪切、復(fù)制、過去和選擇所有它們都可以在沒有問題的情況下工作，但現(xiàn)在我嘗試添加單詞建議，比如用戶選擇一個(gè)單詞并右鍵單擊它應(yīng)該向他顯示的 Richtextbox：詞建議詞建議詞建議...ETC“越線”切復(fù)制過去的“越線”全選這是應(yīng)該的，但問題是建議列表在每次右鍵單擊時(shí)都會(huì)保持重復(fù)（在我選擇單詞之后）這是代碼：ContextMenuStrip cms = new ContextMenuStrip { ShowImageMargin = true };public void AddContextMenu(RichTextBox rtb)    {       if (rtb.ContextMenuStrip == null)        {            ToolStripMenuItem tsmiCut = new ToolStripMenuItem("Cut");            tsmiCut.Image = msg.Properties.Resources.cut;            tsmiCut.Click += (sender, e) => rtb.Cut();            cms.Items.Add(tsmiCut);            ToolStripMenuItem tsmiCopy = new ToolStripMenuItem("Copy");            tsmiCopy.Image = msg.Properties.Resources.copy;            tsmiCopy.Click += (sender, e) => rtb.Copy();            cms.Items.Add(tsmiCopy);            ToolStripMenuItem tsmiPaste = new ToolStripMenuItem("Paste");            tsmiPaste.Image = msg.Properties.Resources.paste;            tsmiPaste.Click += (sender, e) => rtb.Paste();            cms.Items.Add(tsmiPaste);            cms.Items.Add("-");            ToolStripMenuItem sALL = new ToolStripMenuItem("Select All");            sALL.Image = msg.Properties.Resources.select_all;            sALL.Click += (sender, e) => rtb.SelectAll();            cms.Items.Add(sALL);            rtb.ContextMenuStrip = cms;        }    }private void richTextBox_MouseDown(object sender, MouseEventArgs e)    {        Hunspell hunspell = new Hunspell("en_US.aff", "en_US.dic");        hunspell.Spell(richTextBox.SelectedText);        List<string> suggestions = hunspell.Suggest(richTextBox.SelectedText);        ToolStripSeparator line = new ToolStripSeparator();        AddContextMenu(richTextBox);