C# - Can I compile Proto 2 with compiler Proto 3

[Marina Karmely]

HI 

Is there some way to compile ptoto 2 with a compiler of proto 3 in VS 2019 for C#?

For example it can be done easily in Java(Eclipse and C++)

But with the latest version of protoc 3.8.0 when I try to compile proto 2 with compiler of proto 3 I have got the following exception "C# code generation only supports proto3 syntax"..

Do you have any advise?

[Marc Gravell]

If it helps, protobuf-net's schema parser can do this. It is a slightly different API to the Google implementation, though.

You can test it online at https://protogen.marcgravell.com/ - or the command-line tool is available as a standalone utility via various mechanisms (the standalone command-line tool is more versatile than the online version, especially when processing multiple files).

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[Derek Perez]

Yes it should be fine, just set syntax = "proto2" in your file, the compiler understands both I believe.

To view this discussion on the web visit https://groups.google.com/d/msgid/protobuf/CAF95VAyE8hVG8p5qh98ETM91vaaigDbVihXwNX8R1NNb%3DZ3E_A%40mail.gmail.com.

[Marc Gravell]

Unless it has been updated recently, then no - the "protoc"/Google C# implementation is (was?) proto3-only.

[Marina Karmely]

Thank you guys ! it was very helpful

On Sun, Jun 2, 2019 at 9:18 PM Derek Perez <de...@perez.earth> wrote:

Ok news to me. I was under the impression the compiler was agnostically backwards compatible but could be wrong. Also unsure for output language support outside the base support languages.