RazorView NullReferenceException under Docker/Dotnetcore

[jrodenburg]

I am running a dotnet core MVC service using Razor templates. Under local operation (dotnet run), the site works fine but generates NRE in a view when executed under Docker.

I'm guessing this is related to installed SDKs, but I'm following the example here: https://github.com/dotnet/dotnet-docker/tree/master/samples/aspnetapp

Dockerfile:

FROM microsoft/dotnet:2.1-sdk AS build
WORKDIR /app

# copy csproj and restore as distinct layers
COPY *.sln .
COPY admin-ui/*.csproj ./admin-ui/
COPY api-client/*.csproj ./api-client/  # api-client is a project dependency of admin-ui
RUN dotnet restore

# copy everything else and build app
WORKDIR /app/
COPY admin-ui/. ./admin-ui/
COPY api-client/. ./api-client/

WORKDIR /app/admin-ui
RUN dotnet publish -c Release -o out


FROM microsoft/dotnet:2.1-aspnetcore-runtime AS runtime
WORKDIR /app
COPY --from=build /app/admin-ui/out .

ENV ASPNETCORE_ENVIRONMENT=Production
ENV ASPNETCORE_URLS http://*:3600
EXPOSE 3600/tcp
ENTRYPOINT ["dotnet", "admin-ui.dll"]

Accessing a URL called "Brands", the error output:

NullReferenceException: Object reference not set to an instance of an object.
admin_ui.Pages.Pages_Brands.ExecuteAsync() in Brands.cshtml
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, bool invokeViewStarts)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultAsync(IActionResult result)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResultFilterAsync<TFilter, TFilterAsync>()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResultExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.ResultNext<TFilter, TFilterAsync>(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultFilters()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Is this related to MVC, Razor, docker....?

[jrodenburg]

IGNORE the error -- completely unrelated to Razor/MVC/docker.

Don't ignore the error -- an unrelated error was occurring in the stack, but this is what was reported.