类前加： [SoapDocumentService(RoutingStyle = SoapServiceRoutingStyle.RequestElement)]
方法前加：[SoapRpcMethod(Use = SoapBindingUse.Literal, Action = "http://tempuri.org/MethodName", RequestNamespace = "http://tempuri.org/", ResponseNamespace = "http://tempuri.org/")]
不然,方法参数传递,总是为空