Question

System.InvalidOperationException：生成XML文档时出错。 ---＆GT; System.InvalidOperationException：不期望WebService.Property.Property_Users类型。使用XmlInclude或SoapInclude属性指定静态未知的类型。 at System.Xml.Serialization.XmlSerializationWriter.WriteTypedPrimitive（String name，String ns，Object o，Boolean xsiType）在Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write1_Object（String n，String ns，Object o，Boolean isNullable，Boolean needType）在Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write8_ArrayOfAnyType（Object o）在Microsoft.Xml.Serialization.GeneratedAssembly.ListOfObjectSerializer.Serialize（Object objectToSerialize，XmlSerializationWriter writer）在System.Xml.Serialization.XmlSerializer.Serialize（XmlWriter xmlWriter，Object o，XmlSerializerNamespaces namespaces，String encodingStyle，String id） ---内部异常堆栈跟踪结束--- 在System.Xml.Serialization.XmlSerializer.Serialize（XmlWriter xmlWriter，Object o，XmlSerializerNamespaces namespaces，String encodingStyle，String id）在System.Xml.Serialization.XmlSerializer.Serialize（TextWriter textWriter，Object o，XmlSerializerNamespaces名称空间）在System.Xml.Serialization.XmlSerializer.Serialize（TextWriter textWriter，Object o）在System.Web.Services.Protocols.XmlReturnWriter.Write（HttpResponse response，Stream outputStream，Object returnValue）在System.Web.Services.Protocols.HttpServerProtocol.WriteReturns（Object [] returnValues，Stream outputStream）在System.Web.Services.Protocols.WebServiceHandler.WriteReturns（Object [] returnValues）在System.Web.Services.Protocols.WebServiceHandler.Invoke（）

public List<object> GetDataByModuleName(string ModuleName)
    {
       List<Property_Users> obj_UserList = new List<Property_Users>(); 
      // performing some operation that add data to obj_UserList

     List < Object > myList = new List<object>();
            return ConvertToObjectList<Property_Users>(obj_UserList); 
    }
     public List<Object> ConvertToObjectList<N>(List<N> sourceList)
        {
            List<Object> result = new List<Object>();

            foreach (N item in sourceList)
            {
                result.Add(item as Object);
            }
            return result;
        } 

     [WebMethod]
        public List<object> GetDataByModuleName(string ModuleName)
        {
            List<object> obj_list = new List<object>();
            obj_list = BAL_GeneralService.GetDataByModuleName(ModuleName);
            return obj_list;
        }

Answer 1

序列化程序无法序列化object

如果要返回任意类型的列表，则必须Use the XmlInclude or SoapInclude attribute给序列化程序一个提示。

此外，列表必须是同质的，包含只有一种类型的元素。例如您无法返回包含Foo和Bar

的列表

我试图从webmethod返回列表<object>，但给出错误</object>

1 个答案: