将数据从模型传递到自定义validation类

我有一个数据validation类，用于检查会议的开始日期是否在结束日期之前。

该模型会自动传递需要validation的日期，但是我在传递需要validation的数据时遇到了一些困难。

这是我的validation课程

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); } } 

这是包含数据注释的类

 [StartLessThanEnd(ErrorMessage="Start Date must be before the end Date")] public DateTime DateStart { get; set; } 

这是我的控制器

 [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); } 

Answer 1

使用多个属性的validation属性应该应用于模型，而不应用于单个属性：

 [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; } }