Error message for custom validation not showing asp.net core

Question

My custom validation is working, I've tested it, but the error message is not showing.

My annotation:

    [Required(ErrorMessage = "O campo DATA DE NASCIMENTO é obrigatório")]
    [DataValida( ErrorMessage = "O campo DATA DE NASCIMENTO é inválido")]
    public DateTime DataNascimento { get; set; }

My validation definition:

public class DataValida : ValidationAttribute
{        
 public override bool IsValid(object value)
 {

    DateTime dt;
    bool result = DateTime.TryParse(value.ToString(),out  dt);

    return result;
   }

}

my view:

 <div>
            <label for="tbNome">Data Nascimento:</label>
            <input id="tbDataNascimento" type="text" maxlength="10" placeholder="DD/MM/AAAA" asp-for="DataNascimento" class="form-control" />
            <span asp-validation-for="DataNascimento" class="text-danger"></span>
        </div>

The required validation displays the message but my custom validation doesn't.

obs: I've disabled client-side validation.

It will not show because you have not implemented client side validation for the custom attribute. See — CodingYoshi
– CodingYoshi, Commented Mar 1, 2018 at 13:12
What is your issue? Do you want the message to show or NOT to show? — CodingYoshi
– CodingYoshi, Commented Mar 1, 2018 at 13:29
There's something that I should have included, I considered it at first but didn't include, it is the action. I was redirecting when I shouldn't. — Diego Alves
– Diego Alves, Commented Mar 5, 2018 at 13:29

Diego Alves · Accepted Answer · 2018-03-05 13:33:52Z

1

I was redirecting when Errors occurred.

if(ModelState.IsValid)
{
}
else
{
    return RedirectToAction("action");  //this will cause error messages not to show

   return View(objectToPass); //This will work
}

answered Mar 5, 2018 at 13:33

Diego Alves

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Comments

Oscar · Accepted Answer · 2018-03-01 13:10:36Z

0

If your requirement is just to be sure that a valid date have been entered by end user, simply use DataTypeAtribute instead of reinventing the wheel:

[DataType(DataType.DateTime)]
public DateTime DataNascimento { get; set; }

answered Mar 1, 2018 at 13:10

Oscar

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8 Comments

Diego Alves Over a year ago

I need it to be custom. I am validating birth dates I will extend this functionality further. Prevent under age people from registering and etc.

Oscar Over a year ago

@DiegoAlves That seems like a business requirement that should be implemented in your business model, not inside a view model attribute..

CodingYoshi Over a year ago

@oscar business requirement can be impemented in both client and server. Why make a trip to the server if you can write js or custom attribute to enforce rules. But you should never write them only at the client; never trust the client.

Diego Alves Over a year ago

In an asp.net mvc application Can you give a real-world example where I could put this validation.

CodingYoshi Over a year ago

@diegoalves does not matter if you follow DDD, you can still have those rules in javascript on the client.

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