Configure Autofac Container for background thread

问题

I have an asp.net MVC site which has many components registered using an InstancePerHttpRequest scope, however I also have a "background task" which will run every few hours which will not have an httpcontext.

I would like to get an instance of my IRepository which has been registered like this

builder.RegisterGeneric(typeof(EfRepository<>)).As(typeof(IRepository<>))
     .InstancePerHttpRequest();

How do I do this from a non http context using Autofac? I think the IRepository should use the InstancePerLifetimeScope

回答1:

There are several ways of how you can do that:

The best one in my opinion. You can register the repository as InstancePerLifetimeScope as you said. It works with HttpRequests and LifetimeScopes equally well.
```
builder.RegisterGeneric(typeof(EfRepository<>)).As(typeof(IRepository<>))
    .InstancePerLifetimeScope();
```

Your registration for HttpRequest may differ from registration for LifetimeScope, then you can have two separate registrations:

builder.RegisterGeneric(typeof(EfRepository<>)).As(typeof(IRepository<>))
    .WithParameter(...)
    .InstancePerHttpRequest(); // will be resolved per HttpRequest

builder.RegisterGeneric(typeof(EfRepository<>)).As(typeof(IRepository<>))
    .InstancePerLifetimeScope(); // will be resolved per LifetimeScope

You can explicitly create "HttpRequest" scope using its tag. Exposed through MatchingScopeLifetimeTags.RequestLifetimeScopeTag property in new versions.

using (var httpRequestScope = container.BeginLifetimeScope("httpRequest")) // or "AutofacWebRequest" for MVC4/5 integrations
{
    var repository = httpRequestScope.Resolve<IRepository<Entity>>();
}

来源：https://stackoverflow.com/questions/21896002/configure-autofac-container-for-background-thread

标签

ASP.NET

backgroundworker

autofac