protobuf-net UseImplicitZeroDefaults and Enum defaults

问题

We're trying to use protobuf-net but having trouble understanding UseImplicitZeroDefaults which we now disable in a custom RuntimeTypeModel. We initially used the default RuntimeTypeModel but noticed boolean properties were not being cloned even though a DefaultValue was being specified, i.e. DefaultValue=true but when set to false the cloned property would always be true.

We resolved this by creating a custom RuntimeTypeModel which has allowed us to set UseImplicitZeroDefaults to false. But setting this to false is causing the following error;

ProtoBuf.ProtoException: No wire-value is mapped to the enum

Note that some of our enums are non-zero based, could this be causing an issue? How can we clone/serialize boolean properties and enums (mixture of non-zero and zero based)?

Edit: I used some of the information found at: protobuf-net enum serialization and can report:

[ProtoMember(10), DefaultValue(SiteType.Partition)]
public SiteType Type { get; set; }

Still results in the "No wire-value" error.

[ProtoMember(10, IsRequired = true)]
public SiteType Type { get; set; }

Still results in the "No wire-value" error.

public enum SiteType
{
    Error = 0,
    ...

This works but ideally we would like to leave our enum clean.
Perhaps a cleaner way to specify the default value:

[DefaultValue(SiteType.Server)]
public enum SiteType
{
    Server = 1,
    Monkey = 2
    ...

回答1:

We resolved this issue by specifying a default enum for any non-zero based enums. We specified the default in the constructor of the class being serialized. This was by far the tidiest solution and didn't require any additional protobuf-net attributes.

Plus, it made sense to explicitly set a default value for non-zero based enum properties.

来源：https://stackoverflow.com/questions/13887553/protobuf-net-useimplicitzerodefaults-and-enum-defaults

标签

serialization

protocol-buffers

protobuf-net