[英]Passing data from the model into custom validation class
我有一個數據驗證類,用於檢查會議的開始日期是否在結束日期之前。
模型會自動傳遞需要驗證的日期,但是我在傳遞需要驗證的數據時遇到了一些困難。
這是我的驗證課程
sealed public class StartLessThanEndAttribute : ValidationAttribute
{
public DateTime DateEnd { get; set; }
public override bool IsValid(object value)
{
DateTime end = DateEnd;
DateTime date = (DateTime)value;
return (date < end);
}
public override string FormatErrorMessage(string name)
{
return String.Format(CultureInfo.CurrentCulture, ErrorMessageString, name);
}
}
這是包含數據注釋的類
[StartLessThanEnd(ErrorMessage="Start Date must be before the end Date")]
public DateTime DateStart { get; set; }
這是我的控制器
[HttpPost, Authorize]
public ActionResult Create(Pol_Event pol_Event)
{
ViewData["EventTypes"] = et.GetAllEventTypes().ToList();
StartLessThanEndAttribute startDateLessThanEnd = new StartLessThanEndAttribute();
startDateLessThanEnd.DateEnd = pol_Event.DateEnd;
if (TryUpdateModel(pol_Event))
{
pol_Event.Created_On = DateTime.Now;
pol_Event.Created_By = User.Identity.Name;
eventRepo.Add(pol_Event);
eventRepo.Save();
return RedirectToAction("Details", "Events", new { id = pol_Event.EventID });
}
return View(pol_Event);
}
使用多個屬性的驗證屬性應該應用於模型,而不應用於單個屬性:
[AttributeUsage(AttributeTargets.Class)]
public class StartLessThanEndAttribute : ValidationAttribute
{
public override bool IsValid(object value)
{
var model = (MyModel)value;
return model.StartDate < model.EndDate;
}
}
[StartLessThanEnd(ErrorMessage = "Start Date must be before the end Date")]
public class MyModel
{
public DateTime StartDate { get; set; }
public DateTime EndDate { get; set; }
}
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