将项添加到默认的TextBox上下文菜单

Question

有没有办法在没有自己创建的情况下将额外的项添加到默认的WinForms TextBox上下文菜单中？

Answer 1

Subclass TextBox (derive from it) or native handle (with NativeWindow), and then override window procedure as follows:

protected override void WndProc(ref Message m)
{
  if (m.Msg == <your menu id>) { ... return; }
  ...

  if (m.Msg == 0x0093 /*WM_UAHINITMENU*/ || m.Msg == 0x0117 /*WM_INITMENUPOPUP*/ || m.Msg == 0x0116 /*WM_INITMENU*/)
  {
    IntPtr shortcut = m.Msg == 0x0093 ? Marshal.ReadIntPtr(m.LParam) : m.WParam;
    // add <your menu id> to shortcut
    ...
  }
  ...
  base.WndProc(ref m);
}

Answer 2

我认为你应该覆盖WndProc并捕获文本框接收的消息。

Answer 3

It is possible, but complicated. I suggest you implement your own menu using "modern" ContextMenuStrip class instead of standard ContextMenu.