C# ContextMenu EventArgs

Question

当为上下文菜单构建单击事件方法时，Event Args传递单击事件的内容是什么?

我试图建立一个树列表上下文菜单，以便当我右键单击一个文件夹，我有创建一个新文件夹的选项。我想弄清楚的是如何传递被点击的文件夹，这样我就可以在正确的位置创建文件夹。

这是我目前为止写的:

    private void qList_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
        if(e.Button == System.Windows.Forms.MouseButtons.Right)
        {
            ContextMenu cm = new ContextMenu();
            //folder or file
            if(e.Node.ImageKey == "folder")
            {
                cm.MenuItems.Add(new MenuItem("Create New Folder",CreateNewFolder_Click));
                cm.MenuItems.Add("Create New QPack");
                cm.MenuItems.Add("Remove New Folder");
                e.Node.ContextMenu = cm;
            }
            else if (e.Node.ImageKey == "files")
            {
                cm.MenuItems.Add("Create QPack", CreateNewQPack_Click);
                cm.MenuItems.Add("Remove QPack");
                e.Node.ContextMenu = cm; 
            }
        }
    }
    private void CreateNewFolder_Click(object sender, EventArgs e)
    {
    }
    private void CreateNewQPack_Click(object sender, EventArgs e)
    {
    }

Answer 1

您可以简单地创建一个匿名事件处理程序，它将捕获任何相关数据并将其传递给不同的方法:

var menuItem = new MenuItem(
    "Create New Folder",
    // the following lambda will capture the `e` parameter
    (sender, args) => DoSomething(e.Node, "stuff just happened"));

Answer 2

另一种方法是创建自己的自定义菜单项，如下所示:

public class CustomMenuItem : MenuItem
{
    public TreeNode SelectedTreeNode { get; set; }
    public CustomMenuItem(string text, EventHandler onClick, TreeNode treeNode) : base(text, onClick)
    {
        SelectedTreeNode = treeNode;
    }
}

与其像这样创建菜单项

cm.MenuItems.Add(new MenuItem("Create New Folder",CreateNewFolder_Click));

你做:

cm.MenuItems.Add(new CustomMenuItem("Create New Folder", CreateNewFolder_Click, e.Node));

然后你将在你的方法中得到你的TreeNode，像这样:

private void CreateNewFolder_Click(object sender, EventArgs e)
{
    CustomMenuItem customMenuItem = sender as CustomMenuItem;
    MessageBox.Show(customMenuItem.SelectedTreeNode.FullPath);
}