CODEWITHSUNDEEP
c#ef-code-firstentity-framework-4.1
maxlego
maxlego

Reputation: 4914

EF code first attach and create proxy

Let's say I have an entity Foo.

public class Foo
{
  public int Id {get;set;}
  public virtual ICollection<Bar> Bars {get;set;}
}

When I get this entity from the db then I actually get a proxy and everything works as it should be.

But, can I attach Foo to DbContext and create the proxy manually so Bars would not return null after attaching it, but an actual collection of bars?

Meaning

var foo = new Foo { Id = 1 };
Context.Set<Foo>().Attach(foo);
foo = CreateProxyOf(foo);
var countOfBars = foo.Bars.Count();

Is there something like CreateProxyOf?

Upvotes: 4

Views: 1331

Answers (2)

Sam Huggill
Sam Huggill

Reputation: 3126

When you get all Foos or a single Foo you can tell EF to get bars at the same time. For example:

var foos = db.Foos.Include("Bars");

var foo = db.Foos.Include("Bars").Single(f => f.Id == 1);

More details on MSDN here

http://msdn.microsoft.com/en-us/library/bb896272.aspx

Upvotes: 0

Ladislav Mrnka
Ladislav Mrnka

Reputation: 364259

Yes there is a way but instead of Foo's constructor you must use:

var set = Context.Set<Foo>();
var foo = set.Create();
foo.Id = 1;
set.Attach(foo);
var countOfBars = foo.Bars.Count();

Upvotes: 6

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