In a distributed system using Entity Framework, describe how you would handle validation when part of the data comes from external services.
- Implement custom validation logic in a separate service layer
- Perform validation only at the database level
- Propagate validation errors to the calling layer
- Validate incoming data before passing it to Entity Framework for further processing
In a distributed system, data may originate from various sources, including external services. Handling validation in a separate service layer allows you to centralize validation logic, ensuring consistency regardless of the data source. By validating incoming data before passing it to Entity Framework, you can prevent invalid data from being persisted in the database, maintaining data integrity. Propagating validation errors to the calling layer is essential for providing meaningful feedback to the user or client application. This approach enables prompt error handling and validation feedback, enhancing the overall user experience.
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