Message in Chinese (Simplified) (中文(简体))
不能向具有有效 MDI 父级的 Controls 集合添加窗体。
Unlocalized message
Form cannot be added to the Controls collection that has a valid MDI parent.
Search by Google不能向具有有效 MDI 父级的 Controls 集合添加窗体。
Form cannot be added to the Controls collection that has a valid MDI parent.
Search by Google