How can I create custom attributes in ASP.NET MVC?

How can I create custom attributes in ASP.NET MVC?

To create custom attributes in ASP.NET MVC, you can define a class that inherits from the Attribute class. You can then apply this attribute to your models or actions.

Can you give me an example of a custom attribute?

Sure! Here's a simple example: you can create a RequiredIf attribute that checks if a property is required based on the value of another property.

How do I apply this custom attribute to a model?

You can apply it by decorating your model properties with the [RequiredIf] attribute, specifying the conditions in the constructor.

What if I want to validate it in the controller?

You can use the ModelState.IsValid method in your controller action to check if the model validation passes, including your custom attributes.