DotNet Core 创建 Proto 消息公共库

Question

The use case is pretty simple: I have two projects (ProtoProvider & ProtoConsumer).

ProtoProvider has the proto file (to_import.proto) and the message I want to use on the ProtoConsumer.
ProtoConsumer has a referrence on ProtoProvider and attempts to use the ProvidedMessage in the imported.proto. I cannot use the the message because I get "File not found." on the impoort and "ProvidedMessage is not defined" on the compiler for the imported.proto.
EDIT2>>> To clarify I want to create a message like google's google.protobuf.Timestamp and distribute it to another project or projects without the other projects while having the project/projects (consumer) getting the message from the dll. The whole premise of the question is how to use the message defined in to_import.proto in another project through the dll (think of it as a common.grpc lib).

EDIT1>>> The error messages I'm getting

Is there a solution that allows the importing of the proto files from a project reference? I'm looking for something like google's solution for the well-known-types

import "google/protobuf/timestamp.proto";
import "google/protobuf/empty.proto";

source: https://developers.google.com/protocol-buffers/docs/csharptutorial#where-to-find-the-example-code .
(Copying the proto files or moving the files is not an elegant solution).

Below I'll provide the.csproj files

ProtoProvider:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <None Remove="to_import.proto" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Grpc.AspNetCore" Version="2.27.0" />
  </ItemGroup>

  <ItemGroup>
    <Protobuf Include="to_import.proto" GrpcServices="None" />
  </ItemGroup>

</Project>

ProtoConsumer:

    <Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <Protobuf Include="Protos\imported.proto" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Grpc.AspNetCore" Version="2.27.0" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\ProtoProvider\ProtoProvider.csproj" />
  </ItemGroup>
</Project>

Edit>>3 Some context: The purpose of this question is to help me understand a clearer way to implement decimal once (as specified here ) and reuse them in each project.

Answer 1

AFAIK, compiling proto files requires all files (including imports) to exist on disk.

The way this works for the well known types is that they are included in Grpc.Tools nuget package .

So its not possible to ship a class library that accomplishes what you want.

Discussion on a related grpc-dotnet issue suggests using a combination of:

• Building a nuget package containing your common proto and associated class library
• In the consuming code's package reference, use GeneratePathProperty to generate a variable holding the path to the nuget package content
• In the consuming code's Protobuf Include , use AdditionalImportDirs to include the common proto from the nuget package.