New Post: Validating enums with a custom FluentValidator validator

So obvious! Anyways I changed the validator so it also works for nullable enums:

    protected override bool IsValid(PropertyValidatorContext context) {
      Type t = typeof(T).IsGenericType
        ? Nullable.GetUnderlyingType(typeof(T))
        : typeof(T);

      // if T is not an enum to begin with, then must fail without checking anything
      if (!t.IsEnum) return false;

      // valid if T is nullable and value is null
      if (typeof(T).IsGenericType && (_context.PropertyValue == null)) return true;

      // valid if it fits within the enum
      return Enum.IsDefined(t, context.PropertyValue);
    }

And I got the testing code to work too. Thanks for the pointers.

This is really useful in webforms/mvc enviroment for sanitizing inputs. Please consider adding it to the library the next time you make some mods. Awesome library, thanks!