ContextMenuStrip 隐藏和取消隐藏按钮答案

【问题标题】：ContextMenuStrip Hide and UnHide ButtonsContextMenuStrip 隐藏和取消隐藏按钮
【发布时间】：2013-11-18 16:23:13
【问题描述】：

我正在为一个项目开发系统托盘应用程序。当我点击“切换开启”时，我目前卡住了，它不会自行变为“切换关闭”，我希望也许有人能告诉我我做错了什么并帮助我修复它。

上下文菜单的代码

using System;
using System.Diagnostics;
using System.Windows.Forms;
using TestApplicationforRIVC.Properties;
using System.Drawing;

namespace TestApplicationforRIVC {

    class RIVCContextMenu {

        //Is Add Box Displayed?
        bool isAddLoaded = false;

        //Is the Clear box Displayed?
        bool isClearLoaded = false;

        //Is it listening for voice?
        bool toggleOn = false;

        //Creates this Instance
        public ContextMenuStrip Create() {
            //Add the Default Menu Options
            ContextMenuStrip menu = new ContextMenuStrip();
            ToolStripMenuItem item;
            ToolStripMenuItem off;
            ToolStripSeparator sep;

            if(toggleOn) {
                //Toggle Off
                item = new ToolStripMenuItem();
                item.Text = "Toggle Off";
                item.Click += new EventHandler(toggleOffClick);
                item.Image = Resources.toggleOff;
                menu.Items.Add(item);
            }
            if(!toggleOn) {
                //Toggle On
                item = new ToolStripMenuItem();
                item.Text = "Toggle On";
                item.Click += new EventHandler(toggleOnClick);
                item.Image = Resources.toggleOn;
                menu.Items.Add(item);
            }
            // Separator.
            sep = new ToolStripSeparator();
            menu.Items.Add(sep);

            //Add to RIVC Library
            item = new ToolStripMenuItem();
            item.Text = "Add to Library";
            item.Click += new EventHandler(addClick);
            item.Image = Resources.Add;
            menu.Items.Add(item);

            //Clear RIVC Library
            item = new ToolStripMenuItem();
            item.Text = "Clear Library";
            item.Click += new EventHandler(clearClick);
            item.Image = Resources.Delete;
            menu.Items.Add(item);

            // Separator.
            sep = new ToolStripSeparator();
            menu.Items.Add(sep);

            //Exit Program
            item = new ToolStripMenuItem();
            item.Text = "Exit";
            item.Click += new System.EventHandler(exitClick);
            item.Image = Resources.Exit;
            menu.Items.Add(item);

            return menu;
        }

        //Handles the Click Event of the Toggle On Control
        void toggleOnClick(object sender, EventArgs e) {
            toggleOn = true;
        }

        //Handles the Click Even of the Toggle Off Control
        void toggleOffClick(object sender, EventArgs e) {
            toggleOn = false;
        }

        //Handles the Click Event of the Add Control
        void addClick(object sender, EventArgs e) {
            if(!isAddLoaded) {
                isAddLoaded = true;
                //enter Dialog Box Info
                isAddLoaded = false;
            }
        }

        //Handles the Click Event of the Clear Control
        void clearClick(object sender, EventArgs e) {
            if(!isClearLoaded) {
                isClearLoaded = true;
                //enter dialog box info
                isClearLoaded = false;
            }
        }

        //Handles the Click Event of the Exit Control
        void exitClick(object sender, EventArgs e) {
            Application.Exit();
        }
    }
}

希望你们能帮我解决这个小错误。

【问题讨论】：

为什么每次都创建一个全新的菜单？为什么不直接在 Click 处理程序中更改 ToolStripMenuItem() 的 .Text() 属性？
当您点击“Toggle On”时，您只需将“toggleOn”字段更改为“true”。您是否创建了 ContextMenuStrip 的新实例？我建议您按照@Idle_Mind 的建议做并更改文本，然后您可以使用单个处理程序来更改“toggleOn”。

标签： c# winforms .net-4.5

【解决方案1】：

toggle on/off 只需要 1 个菜单项，如下所示：

item = new ToolStripMenuItem();
item.Name = "onOff";//Name it to refer later if needed
item.Text = "Toggle Off";
item.Click += new EventHandler(toggleOnOffClick);
item.Image = Resources.toggleOff;
menu.Items.Add(item);

注意，切换开关项目需要一些初始化状态，假设它是关闭状态（这意味着toggleOn的初始化值应该是@987654324 @)。这是新的toggleOnOffClick 事件处理程序：

void toggleOnOffClick(object sender, EventArgs e) {
  var item = sender as ToolStripMenuItem;
  if(toggleOn){
    item.Text = "Toggle off";
    item.Image = Resources.toggleOff;
  } else {
    item.Text = "Toggle on";
    item.Image = Resources.toggleOn;
  }
  toggleOn = !toggleOn;
}

【讨论】：