How make Docker find referenced projects on build?

Question

How should I reference a project in project file so Docker build finds the projects?

Project file:

<ItemGroup>
    <ProjectReference Include="..\Assets.Core\Assets.Core.csproj" />
    <ProjectReference Include="..\Creator.Components\Creator.Components.csproj" />
    <ProjectReference Include="..\LC.Components.Core\LC.Components.Core.csproj" />
    <ProjectReference Include="..\LC.Components\LC.Components.csproj" />
</ItemGroup>

Dockerfile:

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
WORKDIR /app
EXPOSE 80
EXPOSE 443

COPY *.csproj ./
RUN dotnet restore

COPY . ./
RUN dotnet publish -c Release -o out

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1
WORKDIR /DIRPATH
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "Creator.Demo.dll"]

Output:

Determining projects to restore... Skipping project "C:\Assets.Core\Assets.Core.csproj" because it was not found.
Skipping project "C:\Creator.Components\Creator.Components.csproj" because it was not found. Skipping project "C:\LC.Components.Core\LC.Components.Core.csproj" because it was not found. Skipping project "C:\LC.Components\LC.Components.csproj" because it was not found. Skipping project "C:\Assets.Core\Assets.Core.csproj" because it was not found.
Skipping project "C:\Creator.Components\Creator.Components.csproj" because it was not found. Skipping project "C:\LC.Components.Core\LC.Components.Core.csproj" because it was not found. Skipping project "C:\LC.Components\LC.Components.csproj" because it was not found. Restored C:\app\creator.demo.csproj (in 282 ms).

Where is this DockerFile exist? is it in the same folder where these .csproj files you asking to copy? — Asif
– Asif, Commented Aug 29, 2020 at 7:39
Does this answer your question? Building a Docker image from a multi project dot net core solution — Roar S.
– Roar S., Commented Aug 29, 2020 at 9:15

Mario Villanueva · Accepted Answer · 2022-06-22 16:24:15Z

Is complicated to explaind, why is not posible to build Dockerfile from same project space, then I read this article [blog]: https://josiahmortenson.dev/blog/2020-06-08-aspnetcore-docker-https and finaly understud how I need to run the build.

In my case:

/src
 .sln
 /project1
   project1.csproj
   Dockerfile
 /project2
   project2.csproj
   Dockerfile
 /reference1
   reference1.csproj
 /reference2
   reference2.csproj

Is necesary to move to /src level for run command

docker build -t {nametagedcontainer} -f project1/Dockerfile .

Finally

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS c
WORKDIR /app   

    
COPY ["project1/project1.csproj", "project1/"]
COPY ["reference1/reference1.csproj", "reference1/"]
#others reference if necesary



RUN dotnet restore "project1/project1.csproj" 

COPY . .
WORKDIR "/app/project1"
RUN dotnet build "project1.csproj" -c Release -o /app/build

from c as publish
RUN dotnet publish "project1.csproj" -c Release -o /app/publish
 

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app 
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "{dllname}.dll"]

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