Custom Validation Attribute with Custom Model Binder in MVC 2
- by griegs
I apologise for the amount of code I have included. I've tried to keep it to a minimum.
I'm trying to have a Custom Validator Attribute on my model as well as a Custom Model binder. The Attribute and the Binder work great seperately but if I have both, then the Validation Attribute no longer works.
Here is my code snipped for readability. If I leave out the code in global.asax the custom validation fires but not if I have the custom binder enabled.
Validation Attribute;
public class IsPhoneNumberAttribute : ValidationAttribute
{
public override bool IsValid(object value)
{
//do some checking on 'value' here
return true;
}
}
Useage of the attribute in my model;
[Required(ErrorMessage = "Please provide a contact number")]
[IsPhoneNumberAttribute(ErrorMessage = "Not a valid phone number")]
public string Phone { get; set; }
Custom Model Binder;
public class CustomContactUsBinder : DefaultModelBinder
{
protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
ContactFormViewModel contactFormViewModel = bindingContext.Model as ContactFormViewModel;
if (!String.IsNullOrEmpty(contactFormViewModel.Phone))
if (contactFormViewModel.Phone.Length > 10)
bindingContext.ModelState.AddModelError("Phone", "Phone is too long.");
}
}
Global asax;
System.Web.Mvc.ModelBinders.Binders[typeof(ContactFormViewModel)] =
new CustomContactUsBinder();
