When this page is relevant
Catch ignored TryAdd calls and duplicate registrations that change single-service resolution behavior in Microsoft.Extensions.DependencyInjection.
Problem guide
Detect TryAdd And Duplicate Registration Misuse
This page targets teams debugging confusing registration order issues and silent overrides in service composition code.
Recommended install command
dotnet add package DependencyInjection.Lifetime.Analyzers --version 2.2.2Relevant diagnostics
The rules that cover this failure mode
DI012
Conditional Registration Misuse
- `TryAdd*` calls after an `Add*` already registered that service.