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

如何解决Web服务调用导致System.Xml.XmlException：\'\'，十六进制值为0x00

| 我从Web服务中抛出以下未处理的异常-这与我的代码无关，并且仅在多次异步调用服务器时才间歇性地发生。我已经包含了我返回的代码响应对象，这是唯一返回的内容（因此，通用响应是字符串列表）。 有没有人遇到过这个问题，然后才知道为什么Web服务可能会抛出这个错误？ 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

我跑了提琴手，但这是我从未见过的唯一异常结果，但是我不认为这会导致我遇到的问题吗？

<?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>

    

解决方法

        我以前在错误代码中看到过这一点，该错误代码在用户将值从另一个应用程序复制/粘贴到数据库字段中时没有进行编码或删除0，然后对于这些记录，直到XML解析器一直为0。