[XmlInclude(typeof(DescriptorType))]
[XmlInclude(typeof(DescriptorRecognition))]
[XmlInclude(typeof(SeperatorCollection))]
[XmlInclude(typeof(Descriptor))]
[XmlInclude(typeof(DescriptorCollection))]

向 Web Service 里解释你 Include 的几个类型，如果不解释，调用方法时会报：“使用 XmlInclude 或 SoapInclude 属性静态指定非已知的类型。”这种错误