The built-in validations exposed in the framework may be solving most of our technical validation problems, but there may be some business needs/requirements that require additional provision on top of built-in validations.
The custom validation can be performed at two levels:
- Field level
- Class level
The field-level custom validator can be created using the following:
- Inherit the custom validation class from the ValidationAttribute base type
- Override the IsValid method and handle your business validation
- The IsValid method accepts two parameters—value and validationContext
- The value field is the actual field value against which the attribute is configured
- The validationContext field would have ObjectInstance of the model that contains the configured field
In our blogging system, we can provide a business validation to the publication...
