Protobuf-net错误:不期望类型,也不能推断出合同:BlockHeader

Question

尝试通过以下来自此线程以及其他来源的信息来正确运行openstreetmap pbf文件的反序列​​化:

Protobuf-net反序列化开放街道地图

我目前正在使用r480的protobug dll.我使用protogen从osm proto创建了csharp类文件,但是当我在代码中点击这一点时,我试图从流中读入:

BlockHeader header;
using (var tmp = new LimitedStream(file, length))
{
    header = Serializer.Deserialize<BlockHeader>(tmp); // exception occurs here
}

它抛出以下异常:

InnerException: System.InvalidOperationException
Message=Type is not expected, and no contract can be inferred: BlockHeader
Source=protobuf-net
StackTrace:
  at ProtoBuf.Meta.TypeModel.ThrowUnexpectedType(Type type) in C:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 1115
  at ProtoBuf.Meta.TypeModel.TryDeserializeAuxiliaryType(ProtoReader reader, DataFormat format, Int32 tag, Type type, Object& value, Boolean skipOtherFields, Boolean asListItem, Boolean autoCreate, Boolean insideList) in C:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 848
  at ProtoBuf.Meta.TypeModel.DeserializeCore(ProtoReader reader, Type type, Object value, Boolean noAutoCreate) in C:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 582
  at ProtoBuf.Meta.TypeModel.Deserialize(Stream source, Object value, Type type, SerializationContext context) in C:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 506
  at ProtoBuf.Meta.TypeModel.Deserialize(Stream source, Object value, Type type) in C:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 488
  at ProtoBuf.Serializer.Deserialize[T](Stream source) in C:\Dev\protobuf-net\protobuf-net\Serializer.cs:line 69
  at OsmParserDemo.MainWindow.OsmParse() in C:\Users\crussell\Documents\Visual Studio 2010\Projects\OsmParseMadness\OsmParserDemo\MainWindow.xaml.cs:line 57
  at OsmParserDemo.MainWindow..ctor() in C:\Users\crussell\Documents\Visual Studio 2010\Projects\OsmParseMadness\OsmParserDemo\MainWindow.xaml.cs:line 28

因此,在比较代码结构与protobuf-net示例的结构时,我得到的印象是,我可能会遗漏一些关于识别每个成员的内容.这是正确的,还是我在这个空间的出路？非常感谢任何帮助或提示!

编辑:这是生成的FileFormat.cs类的BlockHeader片段:

BlockHeader

Answer 1

添加代码文件后,一切都变得清晰了.您正在使用的库,基于堆栈跟踪,是protobuf-net; 但是.cs文件与protobuf-net 无关.嗯,很少.

你看,有(至少)2个c#/ .net protobuf实现,我认为你是在混合它们:

• protobuf-csharp-port由Jon Skeet提供,是Java版本的直接端口,意思是:它遵循相同的设计原则和API.如果你同时使用C#和Java,那就太诱人了.
• protobuf网是我的,是从先的原则实施,其目的是地道的.NET,意思是:它可以工作代码首先,对现有的类型(基本一样XmlSerializer,DataContractSerializer等均可),而且还支持如果你愿意,可以使用.proto

令人困惑的是,它们都具有称为"protogen"的代码生成工具.AFAIK,这个命名巧合只是自然的收敛/巧合,而不是计划(好或恶).

从protobuf-csharp-port的protogen生成的c#文件将与protobuf-csharp-port库一起使用

从protobuf-net的protogen生成的c#文件将与protobuf-net库一起使用

这是protobuf-net生成的版本,包括BlockHeader:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

// Generated from: Foo.proto
namespace ConsoleApplication9
{
  [global::System.Serializable, global::ProtoBuf.ProtoContract(Name=@"Blob")]
  public partial class Blob : global::ProtoBuf.IExtensible
  {
    public Blob() {}


    private byte[] _raw = null;
    [global::ProtoBuf.ProtoMember(1, IsRequired = false, Name=@"raw", DataFormat = global::ProtoBuf.DataFormat.Default)]
    [global::System.ComponentModel.DefaultValue(null)]
    public byte[] raw
    {
      get { return _raw; }
      set { _raw = value; }
    }

    private int _raw_size = default(int);
    [global::ProtoBuf.ProtoMember(2, IsRequired = false, Name=@"raw_size", DataFormat = global::ProtoBuf.DataFormat.TwosComplement)]
    [global::System.ComponentModel.DefaultValue(default(int))]
    public int raw_size
    {
      get { return _raw_size; }
      set { _raw_size = value; }
    }

    private byte[] _zlib_data = null;
    [global::ProtoBuf.ProtoMember(3, IsRequired = false, Name=@"zlib_data", DataFormat = global::ProtoBuf.DataFormat.Default)]
    [global::System.ComponentModel.DefaultValue(null)]
    public byte[] zlib_data
    {
      get { return _zlib_data; }
      set { _zlib_data = value; }
    }

    private byte[] _lzma_data = null;
    [global::ProtoBuf.ProtoMember(4, IsRequired = false, Name=@"lzma_data", DataFormat = global::ProtoBuf.DataFormat.Default)]
    [global::System.ComponentModel.DefaultValue(null)]
    public byte[] lzma_data
    {
      get { return _lzma_data; }
      set { _lzma_data = value; }
    }

    private byte[] _bzip2_data = null;
    [global::ProtoBuf.ProtoMember(5, IsRequired = false, Name=@"bzip2_data", DataFormat = global::ProtoBuf.DataFormat.Default)]
    [global::System.ComponentModel.DefaultValue(null)]
    public byte[] bzip2_data
    {
      get { return _bzip2_data; }
      set { _bzip2_data = value; }
    }
    private global::ProtoBuf.IExtension extensionObject;
    global::ProtoBuf.IExtension global::ProtoBuf.IExtensible.GetExtensionObject(bool createIfMissing)
      { return global::ProtoBuf.Extensible.GetExtensionObject(ref extensionObject, createIfMissing); }
  }

  [global::System.Serializable, global::ProtoBuf.ProtoContract(Name=@"BlockHeader")]
  public partial class BlockHeader : global::ProtoBuf.IExtensible
  {
    public BlockHeader() {}

    private string _type;
    [global::ProtoBuf.ProtoMember(1, IsRequired = true, Name=@"type", DataFormat = global::ProtoBuf.DataFormat.Default)]
    public string type
    {
      get { return _type; }
      set { _type = value; }
    }

    private byte[] _indexdata = null;
    [global::ProtoBuf.ProtoMember(2, IsRequired = false, Name=@"indexdata", DataFormat = global::ProtoBuf.DataFormat.Default)]
    [global::System.ComponentModel.DefaultValue(null)]
    public byte[] indexdata
    {
      get { return _indexdata; }
      set { _indexdata = value; }
    }
    private int _datasize;
    [global::ProtoBuf.ProtoMember(3, IsRequired = true, Name=@"datasize", DataFormat = global::ProtoBuf.DataFormat.TwosComplement)]
    public int datasize
    {
      get { return _datasize; }
      set { _datasize = value; }
    }
    private global::ProtoBuf.IExtension extensionObject;
    global::ProtoBuf.IExtension global::ProtoBuf.IExtensible.GetExtensionObject(bool createIfMissing)
      { return global::ProtoBuf.Extensible.GetExtensionObject(ref extensionObject, createIfMissing); }
  }

}

结论:

使用protobuf-net原子,或使用protobuf-csharp-port库.没有混搭.