CODEWITHSUNDEEP
c#serializationprotocol-buffersprotobuf-net
Orionlk
Orionlk

Reputation: 278

Serialize a protoBuf-net message to a stream c# - getting error "Only data-contract classes can be processed"

I have a message in protoBuf which called "package", I generated my .proto file to classes in purpose to fill all the required fields in that "package" and it works fine. Now, I have that protoBuf message instance called "package" and I want to serialize it to a stream and then output it to a file.

                    byte[] data;
                    using (var ms = new MemoryStream())
                    {
                        Serializer.Serialize<repo_package.Package.Builder>(ms, package);
                        data = ms.ToArray();
                    }
                    string packageFilePath = Path.Combine("C:\\1", package.Name);
                    File.WriteAllBytes(packageFilePath, data);

The problem is the I'm getting an Error when I calling to "Serializer" function, the error is

"Only data-contract classes (and lists/arrays of such) can be processed"

Why is that? How I can output my Package (protobuf message) to a file?

Thank you,

Orion.

Upvotes: 2

Views: 2161

Answers (1)

Marc Gravell
Marc Gravell

Reputation: 1062780

This looks like a library cross-over; if your DTO is Package, then the existence of Package.Builder strongly suggests that you are using the code-generation tools from Jon Skeet's protobuf-csharp-port implementation. That is fine, but code generated via protobuf-csharp-port expect to be used with the protobuf-csharp-port library, which probably means "use the WriteTo method on the DTO instance".

protobuf-net is a completely separate implementation of the same serialization protocol; it has separate code-generation tools (admittedly it may be slightly confusing that both involve tools called protogen and protoc). If you use the protobuf-net version of protogen, it will output code that works with the protobuf-net library (for completeness, with protobuf-net it is also common to use code-first, without ever involving a .proto file, but contract-first .proto usage is fully supported).

So; either:

  • stick with the protobuf-csharp-port code-generation, and switch to the protobuf-csharp-port runtime, or:
  • stick with the protobuf-net runtime, and switch to the protobuf-net code-generation

Upvotes: 1

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