c# - 如何更改(并稍后恢复)文本框中的默认上下文菜单

Question

我想更改默认的文本框上下文菜单，所以我创建了自己的菜单并像那样分配它们

texbox.ContextMenu = myContextMenu

但是我不知道如何恢复默认的文本框菜单(在运行时)。仅当我用鼠标右键单击文本框(同时按住控制按钮)时，我才需要显示 myContextMenu。在其他情况下，我需要显示默认的文本框上下文菜单。可能吗？？

Answer 1

这里是微软给出的例子:

http://msdn.microsoft.com/en-us/library/ms750420.aspx

作为记录，这里是使用 WinForms 执行此操作的方法:

public partial class TextBoxContextMenuDemo : Form
{
    ContextMenu mnuContextDefault;
    ContextMenu mnuContextAlt;

    MenuItem mnuItmAltMenuTest;

    public TextBoxContextMenuDemo()
    {
        InitializeComponent();
        InitializeAltContextMenu();
    }

    private void InitializeAltContextMenu()
    {
        mnuContextDefault = new ContextMenu();
        mnuContextDefault = this.TextBox1.ContextMenu;

        mnuItmAltMenuTest = new MenuItem();
        mnuItmAltMenuTest.Index = -1;
        mnuItmAltMenuTest.Text = "Test Menu Item";
        mnuItmAltMenuTest.Click += new System.EventHandler(this.mnuItmAltMenuTest_Click);

        mnuContextAlt = new ContextMenu();
        mnuContextAlt.MenuItems.Add(mnuItmAltMenuTest);
    }

    private void TextBox1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            if ((Control.ModifierKeys == Keys.Control))
            {
                this.TextBox1.ContextMenu = mnuContextAlt;
                TextBox1.ContextMenu.Show(TextBox1, new Point(e.X, e.Y));
            }
            else
            {
                this.TextBox1.ContextMenu = mnuContextDefault;
            }
        }
    }

    private void mnuItmAltMenuTest_Click(object sender, System.EventArgs e)
    {
        MessageBox.Show("You clicked the alternate test menu item!");
    }
}

喂!