在我的MVC应用程序中,我具有以下ViewModel

public class MyViewModel
{
   public int StartYear { get; set; }
   public int? StartMonth { get; set; }
   public int? StartDay { get; set; }

   public int? EndYear { get; set; }
   public int? EndMonth { get; set; }
   public int? EndDay { get; set; }

   [DateStart]
   public DateTime StartDate
   {
       get
       {
           return new DateTime(StartYear, StartMonth ?? 1, StartDay ?? 1);
       }
   }

   [DateEnd(DateStartProperty="StartDate")]
   public DateTime EndDate
   {
       get
       {
           return new DateTime(EndYear ?? DateTime.MaxValue.Year, EndMonth ?? 12, EndDay ?? 31);
       }
   }
 }


我不使用日历助手,因为我需要这种格式的日期(后面有逻辑)。现在,我创建了自定义验证规则:

    public sealed class DateStartAttribute : ValidationAttribute
    {
        public override bool IsValid(object value)
        {
            DateTime dateStart = (DateTime)value;
            return (dateStart > DateTime.Now);
        }
    }

    public sealed class DateEndAttribute : ValidationAttribute
    {
        public string DateStartProperty { get; set; }
        public override bool IsValid(object value)
        {
            // Get Value of the DateStart property
            string dateStartString = HttpContext.Current.Request[DateStartProperty];
            DateTime dateEnd = (DateTime)value;
            DateTime dateStart = DateTime.Parse(dateStartString);

            // Meeting start time must be before the end time
            return dateStart < dateEnd;
        }
    }


问题是DateStartProperty(在本例中为StartDate)不在Request对象中,因为它是在将表单发布到服务器后计算的。因此,dateStartString始终为空。如何获得StartDate的值?

最佳答案

您可以使用反射来获取this answer中的其他属性(在我看来有点不客气),也可以为该类创建自定义验证属性,而不是像here所述的那样创建单个属性。

10-07 20:01
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