C# - 从 ContextMenuStrip 和 "Smart Events"动态添加和删除项目

Question

简而言之，我的问题是如何实现“发送到”(在 Windows 上右键单击文件)

我有一个数据 GridView ，其中还包含一个带有日志文件名的列(我知道每个文件的路径)

我想在我的弹出菜单中添加复制选项到桌面和磁盘上的关键(可移动)驱动程序。

我的弹出菜单可能是这样的:

   View log

   Open file location

   <---------------->

   Copy to -->  Desktop
                (and Removable Drivers)

   ...

所以我想:

1. 在“复制到”子菜单下添加包含“桌面”和所有可移动驱动程序的列表(并删除用户弹出的可移动驱动程序)

2. 正如我所说，我想将文件复制到可移动驱动程序，那么我如何添加“动态事件”——我的意思是——如果用户插入 4 Disk On Key 驱动程序，我在“下有新的 4 行”复制到”子菜单(比方说，桌面和 E:\、F:\、G:\、L:)，所以我需要为每个可移动驱动程序创建新的单击事件，以将文件复制到真正的驱动程序...

关于问题 1 - 我找到了检测可移动驱动程序是否插入计算机的代码，并且我成功地将可移动驱动程序添加到子菜单中。但是我没有从子菜单中删除项目:

private void menu_PopUp_Opening(object sender, CancelEventArgs e)
{
    // Need to remove all removable drivers first --> How to do ?

    // to update the USB drivers when opening new pop up menu
    DriveInfo[] ListDrives = DriveInfo.GetDrives();
    foreach (DriveInfo Drive in ListDrives)
    {
        if (Drive.DriveType == DriveType.Removable)
        {
            // add to popup menu, from: http://stackoverflow.com/questions/5868446/how-to-add-sub-menu-items-in-contextmenustrip-using-c4-0
            (menu_PopUp.Items[3] as ToolStripMenuItem).DropDownItems.Add(Drive.Name + " (" + Drive.VolumeLabel + ")");
        }
    }
}

谢谢你的帮助!

Answer 1

为什么不明确删除除顶部菜单项(即“桌面”)之外的所有菜单子(monad)项:

  ...
  // Need to remove all removable drivers first
  ToolStripMenuItem copyToItem = menu_PopUp.Items[3] as ToolStripMenuItem;

  // Assuming that "Desktop" menu item is the top one, 
  // we should delete all the items except #0 
  for (int i = copyToItem.DropDownItems.Count - 1; i >= 1; --i)
    copyToItem.DropDownItems.RemoveAt(i);

  ...
  // to update the USB drivers when opening new pop up menu
  DriveInfo[] ListDrives = DriveInfo.GetDrives();

  foreach (DriveInfo Drive in ListDrives) {
    if (Drive.DriveType == DriveType.Removable) {
      // add to popup menu, from: http://stackoverflow.com/questions/5868446/how-to-add-sub-menu-items-in-contextmenustrip-using-c4-0
      ToolStripItem item = (menu_PopUp.Items[3] as ToolStripMenuItem).DropDownItems.Add(Drive.Name + " (" + Drive.VolumeLabel + ")");

      item.Tag = Drive.Name; // <- bind (via tag) driver name with menu item
      item.Click += OnRemovableDriveClick;
    }
  }

...

  private void OnRemovableDriveClick(object sender, EventArgs e) {
    ToolStripItem item = sender as ToolStripItem;

    String driveName = item.Tag as String;
    ...