Custom model binding issue - asp.net-mvc

Question

In my MVC 3 solution I want to have all Ids in querystring to be crypted. To decrypt URLs I inherited from DefaultModelBinder and overrided BindProperty method:
public class CryptedIdBinder : DefaultModelBinder
{
protected override void BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, System.ComponentModel.PropertyDescriptor propertyDescriptor)
{
if (propertyDescriptor.Name.ToLower() == "id")
{
propertyDescriptor.SetValue(bindingContext.Model, CryptoHelper.Decrypt(controllerContext.HttpContext.Request.Form["id"]));
return;
}
base.BindProperty(controllerContext, bindingContext, propertyDescriptor);
return;
}
After that I set new DefaultBinder in global.asax on Application_Start:
System.Web.Mvc.ModelBinders.Binders.DefaultBinder = new CryptedIdBinder();
I didn't inherit from IModelBinder because I want to change binding logic only for id fields in solution.
The issue is that BindProperty method is never called. What am I doning wrong?
PS. In order to be sure that I call at least BindModel method I added a peace of this code inside my custom binder, and it was hit by the debugger:
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
return base.BindModel(controllerContext, bindingContext);
}

Answer 1

If your models don't have Id properties of course the BindProperty won't be called. Because it called on the model properties. If I understood your question what you need is to transform each Id named query string parameter. In this case you need a custom value provider instead of a modelbinder. This is good article about the value providers. And it's quite easy to write one:
public class MyValueProviderFacotry : ValueProviderFactory
{
public override IValueProvider GetValueProvider(ControllerContext controllerContext)
{
return new MyValueProvider(controllerContext);
}
}
public class MyValueProvider : IValueProvider
{
private ControllerContext controllerContext;
public MyValueProvider(ControllerContext controllerContext)
{
this.controllerContext = controllerContext;
}
public bool ContainsPrefix(string prefix)
{
return true;
}
public ValueProviderResult GetValue(string key)
{
if (key.ToLower() == "id")
{
var originalValue = controllerContext.HttpContext.Request.QueryString[key];
var transformedValue = CryptoHelper.Decrypt(orignalValue );
var result = new ValueProviderResult(transformedValue,originalValue,CultureInfo.CurrentCulture);
return result;
}
return null;
}
}
In global.asax:
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
ValueProviderFactories.Factories.Insert(4, new MyValueProviderFacotry()); //Its need to be inserted before the QueryStringValueProviderFactory
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
}