Dependency Injection Patterns

When to Use This Skill

Use this skill when:

• Organizing service registrations in ASP.NET Core applications
• Avoiding massive Program.cs/Startup.cs files with hundreds of registrations
• Making service configuration reusable between production and tests
• Designing libraries that integrate with Microsoft.Extensions.DependencyInjection

The Problem

Without organization, Program.cs becomes unmanageable:

// BAD: 200+ lines of unorganized registrations
var builder = WebApplication.CreateBuilder(args);