Web 服务调用导致 System.Xml.XmlException：'.'，十六进制值 0x00

Question

我的 Web 服务引发了以下未处理的异常 - 这与我的代码无关，它只会在多次异步调用服务器时间歇性发生。我已经包含了我返回的代码响应对象，这是唯一返回的东西（因此通用响应是一个字符串列表）。 有没有人遇到过这个问题，知道为什么 Web 服务会抛出这个问题？

整个堆栈跟踪：

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)

简单响应对象（伪代码）：

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

我运行了 fiddler，但这是我没有看到的唯一不寻常的结果，但我认为这不会导致我遇到的问题？

<?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

我之前在错误代码中看到过这种情况，当用户从另一个应用程序将值复制/粘贴到数据库字段中时，该错误代码没有编码或删除 0，然后将这些记录一直输出到 xml 解析器。