模型验证(2)

模型绑定中执行验证

1.重写DefaultModelBinder

 public class ValidatingModelBinder:DefaultModelBinder
    {
        protected override void SetProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, System.ComponentModel.PropertyDescriptor propertyDescriptor, object value)
        {
            // 调用基类
            base.SetProperty(controllerContext, bindingContext, propertyDescriptor, value);
            switch(propertyDescriptor.Name)
            {
                case "ClientName":
                    if(string.IsNullOrEmpty((string)value))
                    {
                        bindingContext.ModelState.AddModelError("ClientName","Please enter your name");
                    }
                    break;
                case "Date":
                    if(bindingContext.ModelState.IsValidField("Date")&&DateTime.Now>((DateTime)value))
                    {
                        bindingContext.ModelState.AddModelError("Date","Please enter a date in the future");
                    }
                    break;
                case "TermsAccepted":
                    if(!((bool)value))
                    {
                        bindingContext.ModelState.AddModelError("TermsAccepted","You must accept the terms");
                    }
                    break;
            }

        }
        protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            base.OnModelUpdated(controllerContext, bindingContext);
            Appointment model = bindingContext.Model as Appointment;
            if(model!=null&&bindingContext.ModelState.IsValidField("ClientName")&&bindingContext.ModelState.IsValidField("Date")&&model.ClientName=="Joe"
                &&model.Date.DayOfWeek==DayOfWeek.Monday)
            {
                bindingContext.ModelState.AddModelError("","Joe can not book appointments on Mondays");
            }
        }
    }

2.注册

        protected void Application_Start() {
            AreaRegistration.RegisterAllAreas();

            DependencyResolver.SetResolver(new NinjectDependencyResolver());

            ModelBinders.Binders.Add(typeof(Appointment),new ValidatingModelBinder());
            RegisterGlobalFilters(GlobalFilters.Filters);
            RegisterRoutes(RouteTable.Routes);
        }

3.修改控制器代码如下

        [HttpPost]
        public ViewResult MakeBooking(Appointment appt)
        {          

            if (ModelState.IsValid)
            {
                repository.SaveAppointment(appt);
                return View("Completed", appt);
            }
            else
            {
                return View();
            }
        }

Metadata验证

    public class Appointment {

        [Required]
        public string ClientName { get; set; }

        [DataType(DataType.Date)]
        [Required(ErrorMessage="Please enter a date")]
        public DateTime Date { get; set; }
        [Range(typeof(bool),"true","true",ErrorMessage="You must accept the terms")]
        public bool TermsAccepted { get; set; }
    }