Question

I have:

public class StudentDto
{
    [Display(Name = "Data de Nascimento")]
    public DateTime? Born { get; set; }
}

I’m using jQuery datepicker, and whenever I put an invalid data, the validation message is: Please enter a valid date.

How can i change this default message?

I’ve already tried using:

[DataType(DataType.Date, ErrorMessage = @"Valor inválido")]

I’ve already tried to create a .resx, and use DefaultModelBinder.ResourceClassKey = "Strings"; , and on my .resx created values for: InvalidPropertyValue, Common_ValueNotValidForProperty, PropertyValueInvalid

None of these worked.

Thanks!

Update: I’m using Unobtrusive validation too!

Answer 1

The following works fine for me:

Model:

public class StudentDto
{
    [Display(Name = "Data de Nascimento")]
    [Required(ErrorMessage = "Some custom message for required date")]  
    public DateTime? Born { get; set; }
}

Controller:

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View(new StudentDto());
    }

    [HttpPost]
    public ActionResult Index(StudentDto dto)
    {
        return View(dto);
    }
}

View:

<script type="text/javascript">
    $(function () {
        $('#Born').datepicker();
    });
</script>

@using (Html.BeginForm())
{
    @Html.LabelFor(x => x.Born)
    @Html.EditorFor(x => x.Born)
    @Html.ValidationMessageFor(x => x.Born)
    <button type="submit">OK</button>
}

Application_Start in Global.asax:

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();

    RegisterGlobalFilters(GlobalFilters.Filters);
    RegisterRoutes(RouteTable.Routes);

    DefaultModelBinder.ResourceClassKey = "Strings";
}

and inside ~/App_GlobalResources/Strings.resx define the key PropertyValueInvalid which will be used if an invalid date is entered. For the value you could use the {0} and {1} placeholders which will be replaced respectively by the value and the display name of the field.