DateTime (date and hour) validation with Data Annotation

问题

I have the following code:

        [DisplayName(\"58.Date and hour of birth\")]
        [DataType(DataType.DateTime, ErrorMessage = \"Please enter a valid date in the format dd/mm/yyyy hh:mm\")]
        [Range(typeof(DateTime), \"1/1/2011\", \"1/1/2016\")]
        [RequiredToClose]
        public object V_58 { get; set; }

I want to force the inclusion of time (in format hh:mm) and not only the date. This code considers 1/1/2011 as valid when it shouldn\'t as it does not containt the hour , Any clue about how to express the correct format ? (dd/mm/yyyy hh:mm)

回答1:

You could write your own ValidationAttribute and decorate the property with it. You override the IsValid method with your own logic.

public class MyAwesomeDateValidation : ValidationAttribute
{
    public override bool IsValid(object value)
    {
        DateTime dt;
        bool parsed = DateTime.TryParse((string)value, out dt);
        if(!parsed)
            return false;

        // eliminate other invalid values, etc
        // if contains valid hour for your business logic, etc

        return true;
    }
}

And finally, decorate your property:

[MyAwesomeDateValidation(ErrorMessage="You were born in another dimension")]
public object V_58 { get; set; }

Note: Be wary of multiple validation attributes on your properties, as the order in which they are evaluated is unable to be determined without more customization, and subsequently if validation logic overlaps, your error messages might not accurately describe what exactly you mean to be wrong with the property (yeah, that's a run-on sentence)

回答2:

Finally solved with a custom ValidationAttribute :

public class DateTimeValidation : RegularExpressionAttribute {
    public DateTimeValidation()
        : base(@"^((((31\/(0?[13578]|1[02]))|((29|30)\/(0?[1,3-9]|1[0-2])))\/(1[6-9]|[2-9]\d)?\d{2})|(29\/0?2\/(((1[6-9]|[2-9]\d)?(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))|(0?[1-9]|1\d|2[0-8])\/((0?[1-9])|(1[0-2]))\/((1[6-9]|[2-9]\d)?\d{2})) (20|21|22|23|[0-1]?\d):[0-5]?\d$") {
        ErrorMessage = "Date must be in the format of : dd/mm/yyyy hh:mm";
    }
}

回答3:

If you just pass date in a string it will consider it as 12:00 AM. If you want to pass time within a string use "06/06/2011 7:00 PM" syntax.

Other workaround would be to keep your string as is, convert it to DateTime & then AddHours &/or AddMinutes to DateTime object depending on your needs.

回答4:

This solution doesn't allow to input time 00.00, but will work with another values.

public class TimeRequiredAttribute : ValidationAttribute
{
    protected override IsValid(object value)
    {
        DateTime result;
        bool parsed = DateTime.TryParse((string)value, out result);
        if(!parsed && DateTime.MinValue.TimeOfDay == result.TimeOfDay)
        {
           return false;
        }
        return true;
    }
}

But it will work only with string proprety.

来源：https://stackoverflow.com/questions/5390403/datetime-date-and-hour-validation-with-data-annotation