Protobuf-net“找不到二进制的无参数构造函数”

Posted 2023-02-16

【中文标题】Protobuf-net“找不到二进制的无参数构造函数”

【英文标题】：Protobuf-net "No parameterless constructor found for Binary"

【发布时间】：2014-11-17 06:27:23

【问题描述】：

我有一堂课在下面

 [DataContract(IsReference = true)]
    [ProtoContract(SkipConstructor = true)]
    public class BelgeDosyasi : TablesBase
    
        public BelgeDosyasi()
        


        
        [DataMember(Order = 1)]
        public Binary HizmetBelgeDosya  get; set; 
        [DataMember(Order = 2)]
        public string HizmetBelgeUzantisi  get; set; 
        [DataMember(Order = 3)]
        public int HizmetBelgeBoyutu  get; set; 
        [DataMember(Order = 4)]
        public string HizmetBelgeAdi  get; set; 
    

这个类帮助从数据库下载二进制文件，没有 protobuf 它工作得很好，但是在开始对对象反序列化使用 protobuf 后，我收到了这个错误“没有找到二进制的无参数构造函数”并且我无法解决这个问题。 我的 protobuf-net 版本是 Version=2.0.0.668。任何帮助表示赞赏。

    at ProtoBuf.Meta.TypeModel.ThrowCannotCreateInstance(Type type) in c:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 1397
   at proto_8(Object , ProtoReader )
   at ProtoBuf.Serializers.CompiledSerializer.ProtoBuf.Serializers.IProtoSerializer.Read(Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Serializers\CompiledSerializer.cs:line 57
   at ProtoBuf.Meta.RuntimeTypeModel.Deserialize(Int32 key, Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Meta\RuntimeTypeModel.cs:line 775
   at ProtoBuf.ProtoReader.ReadTypedObject(Object value, Int32 key, ProtoReader reader, Type type) in c:\Dev\protobuf-net\protobuf-net\ProtoReader.cs:line 579
   at ProtoBuf.ProtoReader.ReadObject(Object value, Int32 key, ProtoReader reader) in c:\Dev\protobuf-net\protobuf-net\ProtoReader.cs:line 566
   at proto_6(Object , ProtoReader )
   at ProtoBuf.Serializers.CompiledSerializer.ProtoBuf.Serializers.IProtoSerializer.Read(Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Serializers\CompiledSerializer.cs:line 57
   at ProtoBuf.Meta.RuntimeTypeModel.Deserialize(Int32 key, Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Meta\RuntimeTypeModel.cs:line 775
   at ProtoBuf.ServiceModel.XmlProtoSerializer.ReadObject(XmlDictionaryReader reader, Boolean verifyObjectName) in c:\Dev\protobuf-net\protobuf-net\ServiceModel\XmlProtoSerializer.cs:line 193
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.PartInfo.ReadObject(XmlDictionaryReader reader, XmlObjectSerializer serializer)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameter(XmlDictionaryReader reader, PartInfo part, 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.DeserializeReply(Message message, Object[] parameters)
   at System.ServiceModel.Dispatcher.ProxyOperationRuntime.AfterReply(ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)



at ProtoBuf.Meta.TypeModel.ThrowCannotCreateInstance(Type type) in c:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 1397
   at proto_8(Object , ProtoReader )
   at ProtoBuf.Serializers.CompiledSerializer.ProtoBuf.Serializers.IProtoSerializer.Read(Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Serializers\CompiledSerializer.cs:line 57
   at ProtoBuf.Meta.RuntimeTypeModel.Deserialize(Int32 key, Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Meta\RuntimeTypeModel.cs:line 775
   at ProtoBuf.ProtoReader.ReadTypedObject(Object value, Int32 key, ProtoReader reader, Type type) in c:\Dev\protobuf-net\protobuf-net\ProtoReader.cs:line 579
   at ProtoBuf.ProtoReader.ReadObject(Object value, Int32 key, ProtoReader reader) in c:\Dev\protobuf-net\protobuf-net\ProtoReader.cs:line 566
   at proto_6(Object , ProtoReader )
   at ProtoBuf.Serializers.CompiledSerializer.ProtoBuf.Serializers.IProtoSerializer.Read(Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Serializers\CompiledSerializer.cs:line 57
   at ProtoBuf.Meta.RuntimeTypeModel.Deserialize(Int32 key, Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Meta\RuntimeTypeModel.cs:line 775
   at ProtoBuf.ServiceModel.XmlProtoSerializer.ReadObject(XmlDictionaryReader reader, Boolean verifyObjectName) in c:\Dev\protobuf-net\protobuf-net\ServiceModel\XmlProtoSerializer.cs:line 193
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.PartInfo.ReadObject(XmlDictionaryReader reader, XmlObjectSerializer serializer)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest)
   at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameter(XmlDictionaryReader reader, PartInfo part, 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.DeserializeReply(Message message, Object[] parameters)
   at System.ServiceModel.Dispatcher.ProxyOperationRuntime.AfterReply(ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

【问题讨论】：

本例中的Binary 是什么？这是你自己的类型吗？或来自 EF / some-random-framework / 的某种类型 ???

亲爱的 Marc，非常感谢您的回复，是的，我发现异常来自二进制类型，它本身是从 Linq.Binary 继承的 av 类型。将其转换为 Byte[] 解决了这个问题。

【参考方案1】：

Marc，非常感谢您的回复，是的，我发现异常来自它自身的 Binary 类型，它是从 Linq.Binary 继承的 av 类型。将其转换为 Byte[] 解决了这个问题。