ASP.Net MVC – model with collection not populating on postback

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I think that your model is too complex for the default model binder to work with. You could try using multiple parameters and binding them with prefixes:

public ActionResult Create( 
    Person person,
    [Bind(Prefix="Person.PersonDetails")]
    PersonDetails details,
    [Bind(Prefix="Person.PersonDetails.ContactInformation")] 
    ContactInformation[] info )
{
      person.PersonDetails = details;
      person.PersonDetails.ContactInformation = info;

      ...
}

Or you could develop your own custom model binder that would understand how to derive your complex model from the form inputs.

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