如何在C＃中使用XmlDocument停止自动关闭的空XML元素？

Before I get jumped on by people saying the XML parser shouldn’t care if the elements are empty or self-closed, there is a reason why I can’t allow self-closed XML elements. The reason is that I’m actually working with SGML not XML and the SGML DTD I’m working with is very strict and doesn't allow it.Before I get jumped on by people saying the XML