C#Captive dependency xảy ra khi scoped service bị inject vào singleton — service scoped sống mãi cùng singleton, không bao giờ được dispose đúng chu kỳ.
Ví dụ: IUnitOfWork (scoped) inject vào AppService (singleton), UnitOfWork bị "giam" mãi, scope không bao giờ kết thúc. Hậu quả: memory leak, dữ liệu stale, connection pool cạn kiệt. Phòng tránh: không bao giờ inject scoped vào singleton; dùng factory pattern hoặc IServiceScopeFactory để tạo scope tạm thời khi cần. Singleton nên stateless.
Captive dependency occurs when a scoped service is injected into a singleton — the scoped service lives as long as the singleton, never disposed at the correct scope boundary.
Example: IUnitOfWork (scoped) injected into AppService (singleton); UnitOfWork is captured and its scope never ends. Consequences: memory leaks, stale data, and connection pool exhaustion. Prevention: never inject scoped services into singletons; use IServiceScopeFactory to create temporary scopes when needed. Singletons should be stateless.