Configurando o desserializador do .NET WCF UTF-8 para modificar / descartar caracteres de formulário não menores, em vez de lançar uma exceção?
Temos um serviço da web SOAP hospedado via WCF.
Um dos clientes dos quais recebemos dados codifica ocasionalmente UTF-8 usando o formato não menor (consultehttp://www.unicode.org/versions/corrigendum1.html para um pouco de informação sobre isso).
Não é fácil modificar o cliente porque esses caracteres de formato não mais curtos não estão sendo codificados pelo nosso código.
Em vez disso, gostaríamos de editar o serviço WCF para descartar esses caracteres, substituí-los por outro caractere de espaço reservado ou até mesmo aceitar os caracteres de formato não mais curtos. Qualquer uma dessas opções seria aceitável para o nosso caso de uso, embora as opções anteriores fossem preferidas, pois diminuem qualquer risco à segurança.
Observando o rastreamento de pilha:
System.ServiceModel.Dispatcher.NetDispatcherFaultException: The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://www.mydomain.com/:mytype. The InnerException message was 'There was an error deserializing the object of type MyNamespace.MyType`1[[System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c461934e089]]. '????' contains invalid UTF8 bytes.'. Please see InnerException for more details. ---> System.Runtime.Serialization.SerializationException: There was an error deserializing the object of type MyNamespace.MyType`1[[System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c461934e089]]. '????' contains invalid UTF8 bytes. ---> System.Xml.XmlException: '????' contains invalid UTF8 bytes. ---> System.Text.DecoderFallbackException: Unable to translate bytes [C0] at index 0 from specified code page to Unicode.
at System.Text.DecoderExceptionFallbackBuffer.Throw(Byte[] bytesUnknown, Int32 index)
at System.Text.DecoderExceptionFallbackBuffer.Fallback(Byte[] bytesUnknown, Int32 index)
at System.Text.DecoderFallbackBuffer.InternalFallback(Byte[] bytes, Byte* pBytes, Char*& chars)
at System.Text.UTF8Encoding.FallbackInvalidByteSequence(Byte*& pSrc, Int32 ch, DecoderFallbackBuffer fallback, Char*& pTarget)
at System.Text.UTF8Encoding.GetChars(Byte* bytes, Int32 byteCount, Char* chars, Int32 charCount, DecoderNLS baseDecoder)
at System.Text.UTF8Encoding.GetChars(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex)
at System.Xml.XmlConverter.ToChars(Byte[] buffer, Int32 offset, Int32 count, Char[] chars, Int32 charOffset)
--- End of inner exception stack trace ---
at System.Xml.XmlConverter.ToChars(Byte[] buffer, Int32 offset, Int32 count, Char[] chars, Int32 charOffset)
at System.Xml.XmlBufferReader.GetChars(Int32 offset, Int32 length, Char[] chars)
at System.Xml.ValueHandle.GetCharsText()
at System.Xml.ValueHandle.GetString()
at System.Xml.XmlBaseReader.get_Value()
at System.Xml.XmlDictionaryReader.ReadContentAsString(Int32 maxStringContentLength)
at System.Xml.XmlBaseReader.ReadContentAsString()
at System.Xml.XmlBaseReader.ReadElementContentAsString()
at System.Runtime.Serialization.XmlReaderDelegator.ReadElementContentAsString()
at ReadOrbliteCompatibleArrayOfstringFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString , XmlDictionaryString , CollectionDataContract )
at System.Runtime.Serialization.CollectionDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context)
at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, DataContract& dataContract)
at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator xmlReader, Type declaredType, DataContract dataContract, String name, String ns)
at System.Runtime.Serialization.DataContractSerializer.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName)
at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName)
--- End of inner exception stack trace ---
at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName)
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
--- End of inner exception stack trace ---
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameters(XmlDictionaryReader reader, PartInfo[] parts, Object[] parameters, Boolean isRequest)
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeBody(XmlDictionaryReader reader, MessageVersion version, String action, MessageDescription messageDescription, Object[] parameters, Boolean isRequest)
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeBodyContents(Message message, Object[] parameters, Boolean isRequest)
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeRequest(Message message, Object[] parameters)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.DeserializeInputs(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
Parece que o que queremos é mudar o fallback do decodificador deSystem.Text.DecoderExceptionFallback paraSystem.Text.DecoderReplacementFallback.
Alguém pode me indicar o local correto e a maneira de substituir o fallback de exceção padrão por um fallback de substituição?