ASP.NET Core: Docker restore/build failed to include the 3rd party assembly from project

Question

Good day everyone,

I'm trying to containerize my ASP.NET Core Application. In my previous projects, this sample docker file works perfectly fine.

FROM microsoft/dotnet:sdk AS build-env

COPY . /app

WORKDIR /app/MyApp
RUN dotnet build

RUN dotnet publish -c Release -o out

FROM microsoft/dotnet:2.2-aspnetcore-runtime
EXPOSE 80
WORKDIR /app
COPY --from=build-env /app/MyApp/out .
ENTRYPOINT [ "dotnet","MyApp.dll" ]

But the problem is, I have a project application that uses a 3rd party assembly or dll (Covered by red marker).

In my local project solution, it compiles and runs alright. But when I'm trying to build my project image, the C# files that use that assembly return an error, it says The type or namespace name 'the_assembly' could not be found. This happens when the docker step is in RUN dotnet build , RUN dotnet restore or RUN dotnet publish...

Any help please?

Answer 1

Check your csproj file if it holds that dll reference as realitve location somewhere in your solution. Maybe you have it in some other place, so this file is not included in docker copy.