Creating custom attributes
Writing a custom validation annotation is easier than you might expect. It’s just a static method with a specific signature. It doesn’t have to extend ValidationAttribute, and can even live in the same class definition as the entity it validates. Here are some examples:
To use the custom method, you pass the class in which it’s declared and the method name to the CustomValidation attribute:
[CustomValidation(typeof(MyClass), "myValidator")]
<CustomValidation(typeof(MyClass), "myValidator")>
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