Implementing custom validation attributes

In this recipe, we dive into the flexibility of customizing validation attributes. While built-in data annotations simplify validation logic, they cover only the most commonly used validation rules. You might find yourself missing the coverage for your specific needs. Fortunately, you can implement custom data validation attributes with unique rules beyond the standard validations provided by .NET. Additionally, Blazor’s native DataAnnotationsValidator component seamlessly integrates with any custom attributes.

Let’s implement an event name validation attribute that checks whether the user provided the event name and scans for any forbidden keywords.

Getting ready

Before we implement a custom validation attribute, do the following:

• Create a Chapter07/Recipe03 directory – this will be your working directory
• Copy EventManager and Event from the Leveraging data annotations for form validation recipe or...