Validation

Question 1

What attribute do you use when a class’s property can’t be null? How do you add an error message?

Answer 1

[Required(ErrorMessage = “”)]

Question 2

What attribute do you use when class’s property can’t exceed a number of characters?

Answer 2

[MaxLength(60, ErrorMessage = “”)]

Question 3

What attribute do you use when a class’s property must be between two numbers?

Answer 3

[Range(18,65, ErrorMessage = “”)]

Question 4

What attribute used on the controller applies a model state validation? How do we supress this behavior if desired?

Answer 4

[ApiController] //
services.Configure( opt => 
{
  opt.SuppressModelStateInvalidFilter = true));
}

Question 5

What is the expression used to check on model state?

Answer 5

if (ModelState.IsValid)