Validate object instances

The validation service implements the EPiServer.Validation.IValidationService interface to validate object instances. You can retrieve the service instance from the IOC container. The service has a single method: IEnumerable<ValidationError> Validate(object instance);.

The service locates implementations of EPiServer.Validation.IValidate<T> during initialization. When a validation request comes for an object instance, the service checks which registered validators the passed-in object assigns and then calls the validators to perform validation.

IValidate interface

To implement a validator, create a class that implements the EPiServer.Validation.IValidate<T> interface, which has a single method defined as: IEnumerable<ValidationError> Validate(T instance);.

You do not need an explicit registration. The validation service locates classes that implement the interface during initialization. When you call EPiServer.Validation.IValidationService to validate an object instance, it calls each validator to which you can assign the object instance. You can implement a validator for an interface or a base class and then call that validator whenever you validate an object that implements or inherits the registered type.

IContentSaveValidate 

To implement a validator that only runs when you save content, you can implement IContentSaveValidation, which extends IValidate but also adds contextual information, such as which save action was used.

DataAnnotationsValidator

Use the EPiServer.Validation.DataAnnotationsValidator<T> base class when you implement a validator that validates against attributes that inherit System.ComponentModel.DataAnnotations.ValidationAttribute.

Content validation

EPiServer.IContentRepository.Save validates a content instance before you save it to verify that you set the required properties. It also validates the properties on the model class (the class inheriting PageData or BlockData or that implements IContent) against any attributes inheriting from System.ComponentModel.DataAnnotations.ValidationAttribute.

You can prevent validation by using the save action EPiServer.DataAccess.SaveAction.SkipValidation flag during save as follows (here it assumes that an instance of EPiServer.IContentRepository was retrieved from the IOC container and assigned to variable contentRepository):
contentRepository.Save(page, SaveAction.Publish | SaveAction.SkipValidation);