this is my first question and I have tried to follow the formatting guidelines as best I could, apologies if I have not. Thanks in advance for any assistance
I am uni student working on a summer job making an android port of an application from windows/windows mobile CE using mono for android. I have basically been learning as I go so apologies if my terminology/knowledge is a bit thin. The application stores a local copy of an sqlite database and only updates changes to the database when the user chooses to sync with the company database. In order to do this it creates a datatable of changes which is serialised so it can be sent over the network, however it seems that there is some sort of incompatibility between the serialisaiton performed by the host server and the serialisation performed by android. When attempting to serialise the datatable I get the following exception: Exception: "Cannot redefine the namespace for prefix '' used at current element" (Stacktrace below) and when attempting to deserialise I get this exception Exception: "Object reference not set to an instance of an object" (Stacktrace below) The code works when run on windows/windows mobile, so I guess we are really just wondering if anyone out there has encountered something similar before and knows of some requirement/formatting quirk in android we are missing. I know that usually code snippets are appreciated but these exceptions seem to be occurring in the mono library, and the code dealing with all of this is encapsulated and I am not really dealing with it directly (as it is all .NET they had hoped it would be a direct port), so I wouldn't know which part to post, however if more detail is needed and someone can point me towards the right functions I will post further information. Regards, Travis Serialize Stacktrace: at System.Xml.XmlTextWriter.WriteEndAttribute () [0x0010c] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml/XmlTextWriter2 .cs:984 \n at System.Xml.DefaultXmlWriter.WriteEndAttribute () [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml/DefaultXmlWrit er.cs:116 \n at System.Xml.XmlSimpleDictionaryWriter.WriteEndAttribute () [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Xml/XmlSimpleDictionaryWriter.cs:97 \n at System.Xml.XmlWriter.WriteAttributeString (System.String prefix, System.String localName, System.String ns, System.String value) [0x00025] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml/XmlWriter.cs:2 67 \n at System.Xml.XmlWriter.WriteAttributeString (System.String localName, System.String value) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml/XmlWriter.cs:2 51 \n at System.Xml.XmlDictionaryWriter.WriteXmlnsAttribute (System.String prefix, System.String namespaceUri) [0x00077] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Xml/XmlDictionaryWriter.cs:396 \n at System.Runtime.Serialization.DataContractSerializer.WriteStartObject (System.Xml.XmlDictionaryWriter writer, System.Object graph) [0x00210] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/DataContractSerializer.cs:492 \n at System.Runtime.Serialization.XmlObjectSerializer.WriteObject (System.Xml.XmlDictionaryWriter writer, System.Object graph) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/XmlObjectSerializer.cs:106 \n at System.ServiceModel.Dispatcher.DataContractMessagesFormatter+DataContractBodyWrit er.WriteMessagePart (System.Xml.XmlDictionaryWriter writer, System.ServiceModel.Description.MessageBodyDescription desc, System.ServiceModel.Description.MessagePartDescription partDesc, System.Object obj) [0x00044] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Dispatcher/BaseMessagesFormatter.cs:501 \n at System.ServiceModel.Dispatcher.DataContractMessagesFormatter+DataContractBodyWrit er.OnWriteBodyContents (System.Xml.XmlDictionaryWriter writer) [0x00091] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Dispatcher/BaseMessagesFormatter.cs:486 \n at System.ServiceModel.Channels.BodyWriter.WriteBodyContents (System.Xml.XmlDictionaryWriter writer) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/BodyWriter.cs:57 \n at System.ServiceModel.Channels.SimpleMessage.OnWriteBodyContents (System.Xml.XmlDictionaryWriter writer) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/MessageImpl.cs:331 \n at System.ServiceModel.Channels.Message.WriteBodyContents (System.Xml.XmlDictionaryWriter writer) [0x00022] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/Message.cs:164 \n at System.ServiceModel.Channels.Message.WriteBody (System.Xml.XmlDictionaryWriter writer) [0x0001c] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/Message.cs:149 \n at System.ServiceModel.Channels.Message.OnWriteMessage (System.Xml.XmlDictionaryWriter writer) [0x00065] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/Message.cs:274 \n at System.ServiceModel.Channels.Message.WriteMessage (System.Xml.XmlDictionaryWriter writer) [0x00026] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/Message.cs:176 \n at System.ServiceModel.Channels.TextMessageEncoder.WriteMessage (System.ServiceModel.Channels.Message message, System.IO.Stream stream) [0x00043] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/TextMessageEncoder.cs:117 \n at System.ServiceModel.Channels.HttpRequestChannel.BeginProcessRequest (System.ServiceModel.Channels.HttpChannelRequestAsyncResult result) [0x00325] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/HttpRequestChannel.cs:173 \n at System.ServiceModel.Channels.HttpRequestChannel.BeginRequest (System.ServiceModel.Channels.Message message, TimeSpan timeout, System.AsyncCallback callback, System.Object state) [0x00012] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/HttpRequestChannel.cs:315 \n at System.ServiceModel.Channels.HttpRequestChannel.Request (System.ServiceModel.Channels.Message message, TimeSpan timeout) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Channels/HttpRequestChannel.cs:72 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Channels.Message msg, TimeSpan timeout) [0x0000b] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:582 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Description.OperationDescription od, System.Object[] parameters) [0x00066] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:537 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.DoProcess (System.Reflection.MethodBase method, System.String operationName, System.Object [] parameters) [0x00038] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:502 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Process (System.Reflection.MethodBase method, System.String operationName, System.Object [] parameters) [0x0001c] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:479 " Deserialize Stacktrace: at System.Xml.Schema.XmlSchemaXPath.Read (System.Xml.Schema.XmlSchemaReader reader, System.Xml.Schema.ValidationEventHandler h, System.String name) [0x00076] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml.Schema/XmlSche maXPath.cs:304 \n at System.Xml.Schema.XmlSchemaUnique.Read (System.Xml.Schema.XmlSchemaReader reader, System.Xml.Schema.ValidationEventHandler h) [0x001e7] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml.Schema/XmlSche maUnique.cs:127 \n at System.Xml.Schema.XmlSchemaElement.Read (System.Xml.Schema.XmlSchemaReader reader, System.Xml.Schema.ValidationEventHandler h) [0x00563] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml.Schema/XmlSche maElement.cs:1182 \n at System.Xml.Schema.XmlSchema.ReadContent (System.Xml.Schema.XmlSchema schema, System.Xml.Schema.XmlSchemaReader reader, System.Xml.Schema.ValidationEventHandler h) [0x00280] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml.Schema/XmlSche ma.cs:883 \n at System.Xml.Schema.XmlSchema.Read (System.Xml.XmlReader rdr, System.Xml.Schema.ValidationEventHandler validationEventHandler) [0x00099] in /home/jon/Development/xamarin/mono/mcs/class/System.XML/System.Xml.Schema/XmlSche ma.cs:729 \n at System.Data.XmlSchemaDataImporter..ctor (System.Data.DataSet dataset, System.Xml.XmlReader reader, Boolean forDataSet) [0x0004b] in /home/jon/Development/xamarin/mono/mcs/class/System.Data/System.Data/XmlSchemaDat aImporter.cs:338 \n at System.Data.DataSet.ReadXmlSchema (System.Xml.XmlReader reader) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.Data/System.Data/DataSet.cs:8 45 \n at System.Data.DataSet.ReadXml (System.Xml.XmlReader reader, XmlReadMode mode) [0x002cd] in /home/jon/Development/xamarin/mono/mcs/class/System.Data/System.Data/DataSet.cs:1 018 \n at System.Data.DataSet.ReadXml (System.Xml.XmlReader reader) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.Data/System.Data/DataSet.cs:8 78 \n at System.Data.DataTable.ReadXml_internal (System.Xml.XmlReader reader, Boolean serializable) [0x00042] in /home/jon/Development/xamarin/mono/mcs/class/System.Data/System.Data/DataTable.cs :1894 \n at System.Data.DataTable.System.Xml.Serialization.IXmlSerializable.ReadXml (System.Xml.XmlReader reader) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.Data/System.Data/DataTable.cs :1807 \n at System.Runtime.Serialization.XmlSerializableMap.DeserializeObject (System.Xml.XmlReader reader, System.Runtime.Serialization.XmlFormatterDeserializer deserializer) [0x0001a] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/SerializationMap.cs:425 \n at System.Runtime.Serialization.XmlFormatterDeserializer.DeserializeByMap (System.Xml.XmlQualifiedName name, System.Type type, System.Xml.XmlReader reader) [0x000ba] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/XmlFormatterDeserializer.cs:234 \n at System.Runtime.Serialization.XmlFormatterDeserializer.Deserialize (System.Type type, System.Xml.XmlReader reader) [0x0028a] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/XmlFormatterDeserializer.cs:187 \n at System.Runtime.Serialization.XmlFormatterDeserializer.Deserialize (System.Xml.XmlReader reader, System.Type declaredType, System.Runtime.Serialization.KnownTypeCollection knownTypes, IDataContractSurrogate surrogate, System.Runtime.Serialization.DataContractResolver resolver, System.Runtime.Serialization.DataContractResolver defaultResolver, System.String name, System.String ns, Boolean verifyObjectName) [0x0007e] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/XmlFormatterDeserializer.cs:65 \n at System.Runtime.Serialization.DataContractSerializer.ReadObject (System.Xml.XmlDictionaryReader reader, Boolean verifyObjectName) [0x00024] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/DataContractSerializer.cs:344 \n at System.Runtime.Serialization.XmlObjectSerializer.ReadObject (System.Xml.XmlDictionaryReader reader) [0x00000] in /home/jon/Development/xamarin/mono/mcs/class/System.Runtime.Serialization/System. Runtime.Serialization/XmlObjectSerializer.cs:74 \n at System.ServiceModel.Dispatcher.DataContractMessagesFormatter.ReadMessagePart (System.ServiceModel.Description.MessagePartDescription part, System.Xml.XmlDictionaryReader r) [0x00032] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Dispatcher/BaseMessagesFormatter.cs:436 \n at System.ServiceModel.Dispatcher.DataContractMessagesFormatter.MessageToParts (System.ServiceModel.Description.MessageDescription md, System.ServiceModel.Channels.Message message) [0x000b8] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Dispatcher/BaseMessagesFormatter.cs:415 \n at System.ServiceModel.Dispatcher.BaseMessagesFormatter.DeserializeReply (System.ServiceModel.Channels.Message message, System.Object[] parameters) [0x0004d] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del.Dispatcher/BaseMessagesFormatter.cs:273 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Description.OperationDescription od, System.Object[] parameters) [0x001cb] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:572 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.DoProcess (System.Reflection.MethodBase method, System.String operationName, System.Object [] parameters) [0x00038] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:502 \n at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Process (System.Reflection.MethodBase method, System.String operationName, System.Object [] parameters) [0x0001c] in /home/jon/Development/xamarin/mono/mcs/class/System.ServiceModel/System.ServiceMo del/ClientRuntimeChannel.cs:479 " -- View this message in context: http://mono-for-android.1047100.n5.nabble.com/Mono-For-Android-Unable-to-Serialise-Deserialise-Datatables-tp5462165p5462165.html Sent from the Mono for Android mailing list archive at Nabble.com. _______________________________________________ Monodroid mailing list [email protected] UNSUBSCRIBE INFORMATION: http://lists.ximian.com/mailman/listinfo/monodroid
