How to convert existing POCO classes in C# to google Protobuf standard POCO

问题

I have POCO classes , I use NewtonSoft json for seralization. Now i want to migrate it to Google protocol buff. Is there any way i can migrate all my classes (not manually) so that i can use google protocol buff for serialization and deseralization.

回答1:

Do you just want it to work? The absolute simplest way to do this would be to use protobuf-net and add [ProtoContract(ImplicitFields = ImplicitFields.AllPublic)]. What this does is tell protobuf-net to make up the field numbers, which it does by taking all the public members, sorting them alphabetically, and just counting upwards. Then you can use your type with ProtoBuf.Serializer and it should behave in the way you expect.

This is simple, but it isn't very robust. If you add, remove or rename members it can all get out of sync. The problem here is that the protocol buffers format doesn't include names - just field numbers, and it is much harder to guarantee numbers over time. If your type is likely to change, you probably want to define field numbers explicitly. For example:

[ProtoContract]
public class Foo {
    [ProtoMember(1)]
    public int Id {get;set;}

    [ProtoMember(2)]
    public List<string> Names {get;} = new List<string>();
}

One other thing to watch out for would be non-zero default values. By default protobuf-net assumes certain things about implicit default values. If you are routinely using non-zero default values without doing it very carefully, protobuf-net may misunderstand you. You can turn that off globally if you desire:

RuntimeTypeModel.Default.UseImplicitZeroDefaults = false;

来源：https://stackoverflow.com/questions/44561170/how-to-convert-existing-poco-classes-in-c-sharp-to-google-protobuf-standard-poco

标签

serialization

protocol-buffers

protobuf-net