ASP.NET MVC如何找到哪個屬性出錯

Question

我想在ModelBinder中出現錯誤，在ModelState中自動附加錯誤代碼。 所以我已經擴展了默認屬性以添加屬性。（關於RequiredAttribute，RangeAttribute等）：

//new Attribute
public class TestRequiredAttribute : RequiredAttribute
{
    public int ErrorCode { get; set; }
}

但是我不知道，如何知道ModelBinder中哪個屬性出錯？

public class TestModelBinder : DefaultModelBinder
{
      protected override void SetProperty(ControllerContext controllerContext,
ModelBindingContext bindingContext,
System.ComponentModel.PropertyDescriptor propertyDescriptor,
object value)
    {
          //the error was happend in here
          base.SetProperty(controllerContext, bindingContext, propertyDescriptor, value);

          //in here to find which attribute has been error?
          to find attribute and to get ErrorCode then 
          bindingContext.ModelState[modelStateName+code] = ...
    }
}

Answer 1

您可以到MVC的來源

http://aspnetwebstack.codeplex.com/SourceControl/latest#src/System.Web.Mvc/DefaultModelBinder.cs

並重寫DefaultModelBinder