IValidatableObject
IValidatableObject is a .NET interface that lets an object perform validation involving its own values and relationships and return validation results.
Building Web APIs with ASP.NET Core
IValidatableObject is a .NET interface that lets an object define validation logic involving its own values and relationships.
- How it is used
- Validates complex request DTOs when a rule concerns the whole object or depends on a generic type.
- How deep it goes
- Walks through implementing Validate on a generic request DTO and reusing a sort-column validator.
- Examples
- Uses a board-game sort-column check and a DomainDTO rule involving Id or Name.
- What you can do after
- Build it from scratch by implementing Validate on a DTO and checking its validation outcome through an API action.
Read how Building Web APIs with ASP.NET Core explains IValidatableObject →
ASP.NET Core in Action, 3e
IValidatableObject is a .NET interface that lets an object perform validation involving its own property values and return validation results.
- How it is used
- Handles cross-property validation in models used with minimal APIs and Razor Pages.
- How deep it goes
- Explains interface implementation, ValidationResult creation, execution order, and service-access limitations without developing complex business validation.
- Examples
- Demonstrates requiring either an email address or phone number through a CreateUserModel Validate method.
- What you can do after
- Apply it by implementing Validate and returning property-linked ValidationResult objects for cross-property rules.
Read how ASP.NET Core in Action, 3e explains IValidatableObject →
Related concepts
- validation attributealternative to · A validation attribute is metadata attached to a class or member that applies a rule for determining whether data satisfies specified requirements.
- validationuses · The process of checking data, behavior, systems, models, or results against defined criteria to assess their correctness, suitability, or acceptability.
- dataannotations attributealternative to · A DataAnnotations attribute is a .NET attribute that declares metadata or validation rules for types, members, and data-model elements.
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