如何将自定义错误消息返回给View？

Question

I have created a datechecker class, which returns an error if the selected date is in the past:

public class ValidateDateRange : ValidationAttribute
{
    public DateTime FirstDate = DateTime.Today;

    //public DateTime SecondDate { get; set; }

    private const string DefaultIncorrectDateMessage = "The date you entered is incorrect. Please try again";

    public string DateInPastMessage { get; set; }

    //public string DateNotInRangeMessage { get; set; }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {          
        // your validation logic
        if (Convert.ToDateTime(value) >= DateTime.Today)
        {
            return ValidationResult.Success;
        }
        else
        {
            return new ValidationResult(DateInPastMessage ?? DefaultIncorrectDateMessage);
        }
    }
}

This is my view:

[ValidateDateRange(DateInPastMessage = "Your date is in the past. Please select a date starting from today!")]
[DataType(DataType.Date)]
public DateTime ArrivalDate { get; set; }

This works correctly, however the DateInPastMessage is now returned as a debug message, when the application fails on db.SaveChanges().

I want to have this message in the View, like a normal error message:

How can I send my custom error message to the View? Can this be done without creating custom jquery validation in every view where I have a datepicker field?

Answer 1

You should set the ErrorMessage in ValidationAttribute . I think that's why it's not showing.

ErrorMessage = DefaultIncorrectDateMessage;