Validate nullable date time with fluent validation

Question

In my web api project, I have model class RegisterModel, There is nullable date time, I want to validate input enter by user only when if user has enter the dob. I'm using Json.Net Serializer

my model class

 [Validator(typeof(RegisterModelValidator))]
   public class RegisterModel
    {
        [JsonProperty("dob")]
        public Nullable<DateTime> DOB { get; set; }
    }

my validator

public class RegisterModelValidator : AbstractValidator<RegisterModel>
    {
        public RegisterModelValidator()
        {
            RuleFor(x => x.DOB).Must(BeAValidDate).WithMessage("Please enter valid date.");
        }
        private bool BeAValidDate(DateTime date)
        {
            if (date == default(DateTime))
                return false;
            return true;
        }
        private bool BeAValidDate(DateTime? date)
        {
            if (date == default(DateTime))
                return false;
            return true;
        }
    }

But when I pass value e.g: "dob":"123 APR 2015" It ModelState.IsValid return false, But does not return validation message.

Aniket Sharma · Answer 1 · 2016-04-30T17:18:23.400

 public ActionResult UpdateDateOfBirth(ModelClass model)
    {
            if (ModelState.IsValid)
            {
                // your logic
            }
            AddErrors(ModelState);
            return View();
    }

    // in my case i have to be add in viewbag
    private void AddErrors(ModelStateDictionary result)
    {

        ViewBag.ErrorMessages = result;
        //foreach (KeyValuePair<string,System.Web.Mvc.ModelState> error in result)
        //{              
        //    //ModelState.AddModelError(error.Key,error.Value.Errors[0].ErrorMessage);

        //}
    }

   // and you can add the validation message on 
   public class ModelClass
   {
    [StringLength(100, ErrorMessage = "Not a valid date of birth"]
    [DataType(DataType.DateTime)]
    [Display(Name = "Date of Birth")]
    public string DateOfBirth{ get; set; }

   }

First I'm using `FluentValidation` not `DataAnotation`. Second My Property is of type `DateTime` not string. So Please see before posting your answer. — Programmer, Apr 30 '16 at 18:30

score 0 · Answer 2 · edited May 23 '17 at 11:44

0

Validating DateTimes using fluent validation only does not seem to possible, as mentioned here. This answer seems to provide the most useful ways of actually validating invalid dates.

edited May 23 '17 at 11:44

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answered Apr 30 '16 at 17:16

Alexei - check Codidact

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Validate nullable date time with fluent validation

2 Answers2