Build a Practical Dependency Injection and Services Example in ASP.NET Core Development

Define the build target

For Dependency Injection and Services, build one endpoint or view that receives a dependency through the framework container, delegates business logic to a service, and tests the boundary independently. Build the boundary case using this implementation lens: Use ASP.NET Core routing, middleware, dependency injection, minimal APIs/controllers, EF Core state, validation, authentication/authorization, logging, health checks, and deployment diagnostics.

Keep the Dependency Injection and Services build centered on these technical constraints: Request/controller/view boundary. Service abstraction. Apply them through this path lens: Use ASP.NET Core routing, middleware, dependency injection, minimal APIs/controllers, EF Core state, validation, authentication/authorization, logging, health checks, and deployment diagnostics. Use ASP.NET Core routing, middleware, dependency injection, minimal APIs/controllers, EF Core state, validation, authentication/authorization, logging, health checks, and deployment diagnostics.

Implement the core behavior

Implement Dependency Injection and Services around the module artifact—a working dependency injection and services exercise with a documented technical result—and keep the implementation specific to this path context: Use ASP.NET Core routing, middleware, dependency injection, minimal APIs/controllers, EF Core state, validation, authentication/authorization, logging, health checks, and deployment diagnostics.

from dataclasses import dataclass

class TaskRepository:
    def save(self, title: str) -> int: ...

@dataclass
class TaskService:
    repository: TaskRepository
    def create(self, title: str) -> int:
        clean = title.strip()
        if not clean:
            raise ValueError('title is required')
        return self.repository.save(clean)

Run the framework test that injects a test repository into TaskService

The request/UI layer can depend on TaskService while storage behavior is supplied through an injected repository boundary.

practice/\n├── README.md\n├── dependency-injection-and-services-build.py\n└── evidence/\n    └── expected-result.txt

Run the complete path

Run one realistic Dependency Injection and Services case end to end and record the required evidence: the module-specific command, output, test, rendered state, query result, log, or measurement that proves the exercise worked. Interpret the result through this path context: Use ASP.NET Core routing, middleware, dependency injection, minimal APIs/controllers, EF Core state, validation, authentication/authorization, logging, health checks, and deployment diagnostics.

Change one meaningful condition

Modify one condition central to Dependency Injection and Services using this path context: Use ASP.NET Core routing, middleware, dependency injection, minimal APIs/controllers, EF Core state, validation, authentication/authorization, logging, health checks, and deployment diagnostics. Predict the new result before rerunning the same workflow.

Verify the artifact

Your deliverable is a working dependency injection and services exercise with a documented technical result.

Common mistakes to avoid

• Service locator/global dependency.
• Wrong dependency lifetime.
• Controller/view contains domain logic.
• Framework configuration differs between test and runtime.