How can I implement parameter validation in ASP.NET?

How can I implement parameter validation in ASP.NET?

You can implement parameter validation in ASP.NET using data annotations, model binding, or custom validation attributes.

Can you give me an example of using data annotations?

Sure! You can use attributes like [Required], [StringLength], and [Range] on your model properties to enforce validation rules.

What if I need more complex validation logic?

For complex validation, you can create custom validation attributes by inheriting from ValidationAttribute and overriding the IsValid method.

How do I handle validation errors in my API responses?

You can return validation errors in your API responses by using ModelState.IsValid to check for errors and then returning a BadRequest with the errors.