如何為 C# <proto/> 定義傳遞experimental_allow_proto3_optional 以在proto3 中啟用可選？ (How to pass experimental_allow_proto3_optional for C# <proto/> definitions to enable optional in proto3?)

問題描述

如何為 C# 定義傳遞experimental_allow_proto3_optional 以在proto3 中啟用可選？ (How to pass experimental_allow_proto3_optional for C# definitions to enable optional in proto3?)

我到處找這個。C# grpc 的人不知道怎麼做，並指向 grpc/grpc 的人提供工具，但你不能在那裡提問。我想我可以將其表述為一項功能，但這感覺就像在作弊。（請添加文檔也顯示如何...）

如何將參數傳遞給中的C# grpc 定義以便我們可以使用可選關鍵字？

謝謝！

參考解法

方法 1:

As for January 2021, the only ‑ yet hacky ‑ way around this is to make your proto filename (or a directory name) contain the string test_proto3_optional, as pointed out by protobuf documentation:

If you try to run protoc on a file with proto3 optional fields, you will get an error because the feature is still experimental. [...] There are two options for getting around this error:

1. Pass ‑‑experimental_allow_proto3_optional to protoc.
2. Make your filename (or a directory name) contain the string test_proto3_optional. This indicates that the proto file is specifically for testing proto3 optional support, so the check is suppressed.

For more information see #977 (grpc‑dotnet), #19164 (AspNetCore.Docs) and #23686 (grpc) issues.

(by James Hancock、Sezi)

參考文件

1. How to pass experimental_allow_proto3_optional for C# definitions to enable optional in proto3? (CC BY‑SA 2.5/3.0/4.0)