ASP.NET MVC and Entity framework - List as a property

Question

with entity framework, how should I load object from an object list ? Example.

public class Phone
{
    public int Id { get; set; }
    public string Type { get; set; }
    public Corporation Corp { get; set; }
}

public class Corporation 
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Phone> Phones { get; set; }
}

// And now, when I get a Corporation class from entity framework,
//I can't access the Phones. I get an error: The value canot be null.
_db.Corporations.First().Name; // Works
_db.Corporations.First().Phones.First().Type; // Fails

How should I load the List properties ?

Jason Meckley · Accepted Answer · 2012-12-05 18:50:55Z

3

mark the related entities as virtual to enable lazy loading by default.

class Corporation
{
   public int Id {get;set;}
   public virtual List<Phone> Phones {get;set;}
}
class Phone
{
   public int Id {get;set;}
   public virtual Corporation Corp {get;set;}
}

answered Dec 5, 2012 at 18:50

Jason Meckley

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