How to call UpdateModel from a custom ModelBinder? (MVC)

Question

I create several custom binders for complex types in my model. My model consists of objects that have their own binders. I want the base object to do its dirty work, and then populate the complex object that it encapsulates, passing standard ModelBinder routing. How to do it?

For illustration purposes, I created a very simple example.

Say my model contains these objects.

public class Person
{
    public string Name {get; set;}
    public PhoneNumber PhoneNumber {get; set;}
}

public class PhoneNumber
{
    public string AreaCode {get; set;}
    public string LocalNumber {get; set;}
}

And I have the following Binders for each of these models. It’s not that PersonBinder needs to fill in PhoneNumber, but doesn’t want to duplicate code in PhoneNumber bundle. How to delegate this back to the routing of the Stardard Binder?

public class PersonBinder: IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext     bindingContext)
    {
        Person person = new Person();
        person.Name = bindingContext.ValueProvider.GetValue(String.Format("{0}.{1}", bindingContext.ModelName, "Name")).AttemptedValue

        // This is where I'd like to have the PhoneNumber object use binding from another customer ModelBinder.
        // Of course the bindingContext.ModelName should be updated to its current value + "PhoneNumber"
        person.PhoneNumber = ???;  // I don't want to explicitly call the PhoneNumberBinder it should go through standard Binding routing.  (ie.  ModelBinders.Binders[typeof(PhoneNumber)] = new PhoneNumberBinder();)

        return person;       
    }
}

public class PhoneNumberBinder: IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext     bindingContext)
    {
        PhoneNumber phoneNumber = new PhoneNumber();
        phoneNumber.AreaCode = bindingContext.ValueProvider.GetValue(String.Format("{0}.{1}", bindingContext.ModelName, "AreaCode")).AttemptedValue
        phoneNumber.LocalNumber = bindingContext.ValueProvider.GetValue(String.Format("{0}.{1}", bindingContext.ModelName, "LocalNumber")).AttemptedValue

        return phoneNumber;
    }
}

And of course, I registered my ModelBinders in the Global.asax.cs file.

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

    RegisterRoutes(RouteTable.Routes);

    ModelBinders.Binders[typeof(Person)] = new PersonBinder();
    ModelBinders.Binders[typeof(PhoneNumber)] = new PhoneNumberBinder();
}

Thank,

Justin

Answer 1

, . , .

public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
     Person person = new Person();
     person.Name = bindingContext.ValueProvider.GetValue("Name").AttemptedValue

     if (bindingContext.ModelName == String.Empty)
     {
         bindingContext.ModelName = "PhoneNumber";
     }
     else
     {
         bindingContext.ModelName = bindingContext.ModelName + ".PhoneNumber";
     }

     PhoneNumber phoneNumber = new PhoneNumber();
     bindingContext.ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => phoneNumber, phoneNumber.GetType());

     IModelBinder binder = ModelBinders.Binders[typeof(PhoneNumber)];
     if (binder == null)
     {
          binder = ModelBinders.Binders.DefaultBinder;
     }

     person.PhoneNumber = binder.BindModel(controllerContext, bindingContext) as PhoneNumber;

     return person;                         
}

, .

• ModelBinder ModelBinders.Binders( , )
• ModelMetadataProvider , .
• ModelName bindingContext , ( "PhoneNumber" ).

Answer 2

, , AutoMapper Action.