Oh, also needed to change all generated classes for descriptor.proto from
internal to public...
On Wednesday, December 2, 2015 at 8:56:12 AM UTC-8, James Hugard wrote:
> Hi Jon:
> Pity that there will be no official support. That means I shall be unable
> to have fully self-describing messages. Further, I believe that will also
> preclude writing proto compiler plugins in C# (F#, VB, etc.).
> As an interim solution (or a permanent one?), I have hand-edited
> Descriptor.proto to remove everything incompatible with proto3, compiled it
> with proto3 syntax, thus generating C# code. The main issue is support for
> extension ranges - without those, it is impossible to declare custom
> options (which we also use). Therefore, I simply compiled all other proto
> files using the original (proto2) descriptor.proto file then hand edited
> the generated code to reference
> Less than ideal, and certainly not acceptable for production use.
> I'm eyeing the Froto <https://github.com/ctaggart/froto> project as a
> possible long-term solution, but with a need to support many languages
> that's also less than ideal and would take .NET out of the primary
> Thanks for the reply!
> On Wednesday, December 2, 2015 at 6:46:52 AM UTC-8, Jon Skeet wrote:
>> On Wednesday, 2 December 2015 04:45:30 UTC, James Hugard wrote:
>>> Trying to use a FileDescriptorSet in my own proto3 message definition
>>> with C# 3.0.0-alpha4 generated code, but running into compilation issues.
>>> The code generates just fine using protoc.exe, but the generated code
>>> won't compile due to a missing reference to "global
>>> Attempting to generate code from the protobuf definition fails, because
>>> the Descriptor.proto file uses proto2 syntax and hence is not supported by
>>> the C# code generator.
>>> A C# object for FileDescriptorSet does not appear to be in
>>> Google.Protobuf assembly. Nor could I figure out how to modify the
>>> generated code to compile properly. Attempting to manually edit the
>>> generated code to use
>>> Google.Protobuf.Reflection.FileDescriptor > failed with a "no
>>> conversion to IMessage<>", or something similar.
>>> Please, what is the right way to use a FileDescriptorSet in my own proto?
>> I'm afraid you can't. We generate the code for descriptor.proto so that
>> we can use it within the protobuf runtime, but it's all internal - we don't
>> have any codegen to support proto2 semantics, and we've carefully looked at
>> what we need from descriptor.proto to check that it's okay with what we
>> need to use it for internally, but that's all. It would be a bad idea to
>> expose it separately.
>> If we ever retroactively fit proto2 support, that would be fine, of
>> course - but until then, I'm afraid there's no way of doing this. You could
>> create your own proto3 copy of descriptor.proto, taking only the bits you
>> care about, and if you're very careful you *may* then be able to
>> interoperate with code that actually expects a FileDescriptorSet... but you
>> would definitely need to be careful.
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