The result of a web service call is System.Xml.XmlException: '.', Hexadecimal value 0x00

Question

I get the following unhandled exception thrown from my web service - this has nothing to do with my code, and it only happens periodically when you call the server asynchronously many times. I included the code response object that I received, and also this is the only thing returned (in this case, the general response is a list of strings). Has anyone come across this before to know why a web service might quit this?

Whole stack trace:

System.Xml.XmlException: '.', hexadecimal value 0x00, is an invalid character. Line 4, position -88. at System.Xml.XmlTextReaderImpl.Throw(Exception e) at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args) at System.Xml.XmlTextReaderImpl.Throw(Int32 pos, String res, String[] args) at System.Xml.XmlTextReaderImpl.ThrowInvalidChar(Int32 pos, Char invChar) at System.Xml.XmlTextReaderImpl.ParseNumericCharRefInline(Int32 startPos, Boolean expand, BufferBuilder internalSubsetBuilder, Int32& charCount, EntityType& entityType) at System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars) at System.Xml.XmlTextReaderImpl.ParseText() at System.Xml.XmlTextReaderImpl.ParseElementContent() at System.Xml.XmlTextReaderImpl.Read() at System.Xml.XmlTextReader.Read() at System.Xml.XmlReader.ReadElementString() at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderPartsLibraryService.Read29_GenericResponseOfListOfString(Boolean isNullable, Boolean checkType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderPartsLibraryService.Read34_UploadPartsResponse() at Microsoft.Xml.Serialization.GeneratedAssembly.ArrayOfObjectSerializer5.Deserialize(XmlSerializationReader reader) at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events) 

Simple Response Object (pseudo-code):

 Public Class GenericResponse(Of T) Public Enum StateOptions Private _result As T Private _state As StateOptions Private _msg As String Public Property Result() As T Public Property State() As StateOptions Public Property Message() As String End Class 

I ran the violinist, but this was the only one of the usual result that I did not see, but I don’t think this would cause the problem I encountered?

 <?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><UploadPartsResponse xmlns="http://autovhc.co.uk/"><UploadPartsResult><Result><string>-------------------------------------------------- 01/06/2011 14:38:33 Upsert Exception Backend sent unrecognized response type: &#x0; at Npgsql.NpgsqlState.&lt;ProcessBackendResponses_Ver_3&gt;d__a.MoveNext() in C:\projects\Npgsql2\src\Npgsql\NpgsqlState.cs:line 966 at Npgsql.ForwardsOnlyDataReader.GetNextResponseObject() in C:\projects\Npgsql2\src\Npgsql\NpgsqlDataReader.cs:line 1163 at Npgsql.ForwardsOnlyDataReader.GetNextRowDescription() in C:\projects\Npgsql2\src\Npgsql\NpgsqlDataReader.cs:line 1181 at Npgsql.ForwardsOnlyDataReader.NextResult() in C:\projects\Npgsql2\src\Npgsql\NpgsqlDataReader.cs:line 1367 at Npgsql.NpgsqlCommand.ExecuteNonQuery() in C:\projects\Npgsql2\src\Npgsql\NpgsqlCommand.cs:line 523 at VHC.Connections.DataAccess2.DataAccess.sqlNonQuery(NpgsqlCommand sqlCmd, Boolean closeConnection) in E:\svn_repository\vhc.server.solution\vhc.connections\Tags\v_3_0_0_5\New\ConnectionProxys\DataAccess.vb:line 119 at VHC.Connections.DataAccess2.DataAccess.sqlNonQuery(NpgsqlCommand sqlCmd) in E:\svn_repository\vhc.server.solution\vhc.connections\Tags\v_3_0_0_5\New\ConnectionProxys\DataAccess.vb:line 97 at PartsLibServerSideClasses.DAO.PLM_PsaFormat_DAO.Update(PartLibraryPartTO part, Int32 entityref, NpgsqlConnection conn) in C:\Applications\PartsImporter\Import_Library-Stable\PartsLibServerSideClasses\DAO\PSA\PLM_PsaFormat_DAO.vb:line 61 at PartsLibServerSideClasses.DAO.PLM_PsaFormat_DAO.Upsert(PartLibraryPartTO part, Int32 entityref) in C:\Applications\PartsImporter\Import_Library-Stable\PartsLibServerSideClasses\DAO\PSA\PLM_PsaFormat_DAO.vb:line 21 at PartsLibServerSideClasses.Parsing.PartsLibraryManager.SubmitPartToLibrary(PartLibraryPartWorkSegmentContainer partContainer) in C:\Applications\PartsImporter\Import_Library-Stable\PartsLibServerSideClasses\BOL\PartsLibraryManager.vb:line 70 </string></Result><State>Fail</State></UploadPartsResult></UploadPartsResponse></soap:Body></soap:Envelope> 

Answer 1

I saw this before in the error code, which did not encode or delete 0 when users copied / pasted values ​​into the database field from another application, and then zero was output completely for these entries to the xml parser.