Frequently Asked Questions

• How do I work with per-request lifetime scope?
  • Note on ASP.NET Core
  • Registering Dependencies as Per-Request
  • How Per-Request Lifetime Works
  • Sharing Dependencies Across Apps Without Requests
  • Testing with Per-Request Dependencies
    • Faking an MVC Request Scope
    • Faking a Web API Request Scope
  • Troubleshooting Per-Request Dependencies
    • No Scope with a Tag Matching ‘AutofacWebRequest’
    • No Per-Request Filter Dependencies in Web API
  • Implementing Custom Per-Request Semantics
• How do I pick a service implementation by context?
  • Option 1: Redesign Your Interfaces
  • Option 2: Change the Registrations
  • Option 3: Use Keyed Services
  • Option 4: Use Metadata
• How do I create a session-based lifetime scope in a web application?
  • Why This is a Bad Idea
    • Memory Footprint
    • Not Farm Friendly
    • Session Not Consistently Used
    • Unreliable Disposal
  • How to Do It
• Why aren’t my assemblies getting scanned after IIS restart?
• How do I conditionally register components?
  • Use Configuration
  • Use Modules
  • Lambda Registrations
• How do I share component registrations across application types?
• How do I keep Autofac references isolated away from my app?
  • Application Startup
  • Component Registrations
    • Assembly Scanning
    • Modules
    • Configuration
    • IStartable
  • Service Resolution
    • Service Location
    • Implicit Relationships
• Why are “old versions” of the framework (e.g., System.Core 2.0.5.0) referenced?
• Why don’t all Autofac packages target the latest Autofac core?
• How do I inject configuration, environment, or context parameters?
  • Option 1: Register Using a Lambda
  • Option 2: Use a Provider
• How do I pass a parameter to a component in the middle of a resolve chain?
  • Why This is a Design Problem
  • Solutions
• Why isn’t container registration analysis built in?
• Why are things in my Xamarin app misbehaving?