Blog topic
Topic index for ASP.NET Core DI — links to lifetimes, Unable to resolve service, and IOptions deep dives.
ASP.NET Core dependency injection — start with DI lifetimes, then troubleshooting and options articles linked below.
This page is the article map for ASP.NET Core DI. Lifetimes, resolve failures, and options variants each own a dedicated URL.
| You want… | Open |
|---|---|
| Lifetimes / captive dependencies | DI in ASP.NET Core |
| Unable to resolve service | Unable to resolve service |
| IOptions vs Snapshot vs Monitor | IOptions guide |
| Keyed services | FromKeyedServices |
The built-in container registers services in Program.cs, resolves constructor parameters, and disposes scoped/singleton disposables. Lifetime rules and anti-patterns live on the DI article — not this index.
Related: C# Design Patterns
Read Dependency Injection in ASP.NET Core for lifetimes and captive dependencies. This page is the article index.
Registration and resolve failures: Unable to resolve service.
Full comparison: IOptions vs IOptionsSnapshot vs IOptionsMonitor.
Updated Published 11 min read
C# dependency injection in ASP.NET Core — AddTransient vs AddScoped vs AddSingleton, what a transient dependency is, captive dependencies, and habits that keep .NET APIs testable.
5 min read
Fix the ASP.NET Core 'Unable to resolve service' DI error — lifetime mismatches, missing registrations, and captive dependency traps.
Updated Published 6 min read
Options pattern in C# — when to inject IOptions, IOptionsSnapshot, or IOptionsMonitor, AddOptions vs Configure, named options, and the production bugs I see when teams pick the wrong one.
5 min read
How I use AddKeyedScoped and FromKeyedServices in ASP.NET Core for closed sets of implementations — EDI vs FHIR clients, tenant notifiers — and when a factory is still the honest design.