Support Generic Hosts in ASP.NET Core 2.1

[michael-wolfenden]

ASP.NET Core 2.1 has introduced Generic Hosts with the new IHostBuilder abstraction which allows configuring a custom container.

It would be nice to have a UseAutofac extension on IHostBuilder as we have on IWebHostBuilder that abstracts the following

var host = new HostBuilder()
    .UseServiceProviderFactory<ServiceContainer>(new SerivceContainerFactory())
    .ConfigureContainer<ServiceContainer>((hostContext, container) =>
    {
    })

[tillig]

I'd be interested in ways we can do something like this and still support pre-ASP.NET-2.1 clients. Maybe @alexmg knows a trick. Problem is we can do conditional compilation on .NET framework but not really based on target dependency versions.

I ran into a similar issue in the multitenant ASP.NET Core support where they made a breaking change in the ASP.NET Core framework but I got around it with some fancy reflection. It wasn't a change in the public Autofac API that should only show up based on the ASP.NET Core you're on.

I'd hate to have to maintain a different integration package for every ASP.NET Core version just to support new convenience extension methods.

[alexmg]

I have created a sample of using Autofac with the new .NET Generic Host.

https://github.com/autofac/Examples/tree/master/src/GenericHostBuilderExample

I don't think there is anything special we have to do here as everything required is in the Autofac.Extensions.DependencyInjection package.

[Deleted user]

That sample builds and runs but it hangs on a thread and does not close down completely. I am unable to get autofac working properly without hanging on console shutdown.

[Thumann]

Same issue as brianw2,

Adding UseConsoleLifetime() doesn't help.

[alex-namely]

Same issue for me, in plain .net core console project.
Console just hangs on shutdown when UseServiceProviderFactory used

[matthewbcline]

@Thumann, @alexmg, and @alex-namely -- did you ever come up with a more generic fix for this? I'm not using Hangfire but am having the same problem -- the console hangs on shutdown.

[matthewbcline]

Updating to the latest Autofac (4.8.1) resolved this for me.