Validate Enum Values

Question

I need to validate an integer to know if is a valid enum value.

What is the best way to do this in C#?

Answer 1

You can use the FluentValidation for your project. Here is a simple example for the "Enum Validation"

Let's create a EnumValidator class with using FluentValidation;

public class EnumValidator : AbstractValidator where TEnum : struct, IConvertible, IComparable, IFormattable
{
    public EnumValidator(string message)
    {
        RuleFor(a => a).Must(a => typeof(TEnum).IsEnum).IsInEnum().WithMessage(message);
    }

}

Now we created the our enumvalidator class; let's create the a class to call enumvalidor class;

 public class Customer 
{
  public string Name { get; set; }
  public Address address{ get; set; }
  public AddressType type {get; set;}
}
public class Address 
{
  public string Line1 { get; set; }
  public string Line2 { get; set; }
  public string Town { get; set; }
  public string County { get; set; }
  public string Postcode { get; set; }

}

public enum AddressType
{
   HOME,
   WORK
}

Its time to call our enum validor for the address type in customer class.

public class CustomerValidator : AbstractValidator
{
    public CustomerValidator()
   {
     RuleFor(x => x.type).SetValidator(new EnumValidator("errormessage");
  }
}