我想强制我系统中的所有日期都是有效的,而不是将来,所以我在自定义模型绑定器中强制它们:
class DateTimeModelBinder : IModelBinder {
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) {
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
try {
var date = value.ConvertTo(typeof(DateTime), CultureInfo.CurrentCulture);
// Here I want to ask first if the property has the FutureDateAttribute
if ((DateTime)date > DateTime.Today) {
bindingContext.ModelState.AddModelError(bindingContext.ModelName, "No se puede indicar una fecha mayor a hoy");
}
return date;
}
catch (Exception) {
bindingContext.ModelState.AddModelError(bindingContext.ModelName, "La fecha no es correcta");
return value.AttemptedValue;
}
}
}
现在,对于一些例外情况,我想允许一些日期在未来
[Required]
[Display(Name = "Future Date")]
[DataType(DataType.DateTime)]
[FutureDateTime] <-- this attribute should allow the exception
public DateTime FutureFecha { get; set; }
这是属性
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public class FutureDateTimeAttribute : Attribute {
}
现在,问题是:如何检查该属性是否存在于BindModel
方法中?