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How do Dependency Injection scopes affect Razor Views, Controllers, and Middleware differently?

Expert .NET Core
Quick Answer Controllers receive Scoped services — fresh per request. Middleware registered as singletons (inline lambdas) must not capture Scoped services — inject them via IServiceProvider.CreateScope() instead. Razor Views can inject services via @inject and receive Scoped services correctly. The key rule: never store a Scoped service in a Singleton field.

Answer

Controllers use scoped services per request, Razor Views should avoid heavy scoped logic, and Middleware must avoid scoped services because middleware is created once and would turn scoped dependencies into singletons.

This scope behavior prevents state leakage, concurrency bugs, and lifecycle misalignment across pipeline components.

S
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This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.

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Source: SugharaIQ

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