Message in Chinese (Simplified) (中文(简体))
如果构造 PackagePart 对象时为内容类型传递空值,则 PackagePart 子类必须实现 GetContentTypeCore 方法。
Unlocalized message
PackagePart subclass must implement GetContentTypeCore method if passing a null value for the content type when PackagePart object is constructed.
Search by Google