C#如何禁止textbox 复制、粘贴、剪切、鼠标右键

    1。继承控件，屏蔽消息

       private const int WM_GETTEXT = 0x000d;
        private const int WM_COPY = 0x0301;
        private const int WM_PASTE = 0x0302;
        private const int WM_CONTEXTMENU = 0x007B;
        private const int WM_RBUTTONDOWN = 0x0204;
        class TextBoxCtrl : TextBox//继承控件屏蔽消息
        {
            protected override void WndProc(ref Message m)
            {
                if (m.Msg == WM_RBUTTONDOWN || m.Msg == WM_GETTEXT || m.Msg == WM_COPY)
                    return;
                base.WndProc(ref m);
            }
        }    

2. 设置键盘和鼠标事件 

        private void  TextBoxCtrl_KeyDown(object sender, KeyEventArgs e)
        {
             if (e.Control && e.KeyCode == Keys.V)
                 e.Handled = true;
        }

        private void TextBoxCtrl_MouseDown(object sender, MouseEventArgs e)
        {
              if (e.Button == MouseButtons.Right)
              {
                    TextBoxCtrl.ContextMenu = new ContextMenu();
              }
        }

3. 用HOOK勾住textbox的消息，比较复杂 。