我尝试将外部库导入我的项目,但收到错误消息:
错误 CS0012:
System.Xml.XmlElement' is defined in an assembly that is not referenced. Consider adding a reference to assembly
System.Xml 类型,版本=2.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089'
System.XML (2.0.5.0) 已添加到项目中。可能是什么问题?