.Net 7 Worker service template doesn't appear to configure Docker correctly

[replaysMike]

Hey all,

I'm pretty new to Docker, and ran into an issue right out of the gate. Created a new worker service application using the built-in templates, with Docker enabled. As soon as I try to run the service, the container gets created but immediately throws the error: No frameworks were found.. I'm not really sure to go from here. Is it using the wrong container in the template? Do I install it manually?

Project file

<PropertyGroup>
  <TargetFramework>net7.0</TargetFramework>
  <Nullable>enable</Nullable>
  <ImplicitUsings>enable</ImplicitUsings>
  <UserSecretsId>...</UserSecretsId>
  <DockerDefaultTargetOS>Windows</DockerDefaultTargetOS>
  <DockerfileContext>..\..</DockerfileContext>
</PropertyGroup>

Dockerfile

#See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.

#Depending on the operating system of the host machines(s) that will build or run the containers, the image specified in the FROM statement may need to be changed.
#For more information, please see https://aka.ms/containercompat

FROM mcr.microsoft.com/dotnet/runtime:7.0 AS base
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /src
COPY ["Service/SystemMonitor.MonitoringService/SystemMonitor.MonitoringService.csproj", "Service/SystemMonitor.MonitoringService/"]
RUN dotnet restore "Service/SystemMonitor.MonitoringService/SystemMonitor.MonitoringService.csproj"
COPY . .
WORKDIR "/src/Service/SystemMonitor.MonitoringService"
RUN dotnet build "SystemMonitor.MonitoringService.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "SystemMonitor.MonitoringService.csproj" -c Release -o /app/publish /p:UseAppHost=false

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "SystemMonitor.MonitoringService.dll"]

Docker log

You must install or update .NET to run this application. 
2023-05-15 19:44:26 
2023-05-15 19:44:26 App: C:\app\bin\Debug\net7.0\SystemMonitor.MonitoringService.dll
2023-05-15 19:44:26 Architecture: x64
2023-05-15 19:44:26 Framework: 'Microsoft.AspNetCore.App', version '7.0.0' (x64)
2023-05-15 19:44:26 .NET location: C:\Program Files\dotnet\
2023-05-15 19:44:26 
2023-05-15 19:44:26 No frameworks were found.
2023-05-15 19:44:26 
2023-05-15 19:44:26 Learn about framework resolution:
2023-05-15 19:44:26 https://aka.ms/dotnet/app-launch-failed
2023-05-15 19:44:26 
2023-05-15 19:44:26 To install missing framework, download:
2023-05-15 19:44:26 https://aka.ms/dotnet-core-applaunch?framework=Microsoft.AspNetCore.App&framewor
2023-05-15 19:44:26 k_version=7.0.0&arch=x64&rid=win10-x64

[replaysMike]

solved it. Weird but having the NLog.Web.AspNetCore package specified caused this error. It's not an AspNetCore application, but was being used for the builder extensions.

[ikramer-hcat]

What was your solution for this? I ran into it today with NLog. Thanks.

[snakefoot]

The runtime package was probably missing ASP.NET, which your app requested, mabye because you didn't use the mcr.microsoft.com/dotnet/aspnet image.