AddSingleton is swallowing exceptions silently

[colemickens]

services.AddSingleton<IDatabase>((IServiceCollection) => configureRedis());

configureRedis() is throwing an exception. I know because I catch it, print the exception and then rethrow it. It seems that AddSingleton or something down the stack is swallowing the exception. As a user, I didn't know until I was informed that Could not resolve a service of type 'StackExchange.Redis.IDatabase' for the parameter.....

Not sure if this is standard for DI or a bug or something else?

[nil4]

Could be related to aspnet/Hosting#695

[pranavkm]

Dup of aspnet/Tooling#363.

[colemickens]

@pranavkm Can you give more details? That bug was labeled "fixed" nearly two months ago yet I'm experiencing this will the latest dotnet builds.

[davidfowl]

@colemickens repro?

[colemickens]

This commit shows what I'm seeing at least, on top of the cli-samples repo:

colemickens/cli-samples@cd71527

Compilation succeeded.
    0 Warning(s)
    0 Error(s)

Time elapsed 00:00:06.1246725


Unhandled Exception: System.Exception: Could not resolve a service of type 'HelloMvcApi.IFoo' for the parameter 'foo' of method 'Configure' on type 'HelloMvcApi.Startup'.
   at Microsoft.AspNetCore.Hosting.Startup.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at HelloMvcApi.Program.Main(String[] args)

So, it gets to ConfigureServices and complains there's no IFoo, but it didn't complain about the uncaught exception in makeFoo. But maybe I'm misunderstanding the expected behavior...

[colemickens]

David got me sorted out in Jabbr. I'm still seeing this because I'm using the ci release nuget feed. Thanks all.

[colemickens]

AFAICT this is still happening...