Tip 24 – How to get the ObjectContext from an Entity

re: Tip 24 – How to get the ObjectContext from an Entity

RK — Wed, 13 Apr 2011 09:47:19 GMT

Thanks a lot.

Getting the context of an entity was pretty useful to me, to be able to see if the underlying objectcontext has been disposed (and then handle it accordingly). Thanks for the article.

re: Tip 24 – How to get the ObjectContext from an Entity

Michael Smit — Wed, 17 Nov 2010 11:25:57 GMT

I have been trying a way to do this for nearly TWO DAYS now and finally came upon your post - AND IT WORKS!!! Thank-you, thank-you, thank-you.

My scenaria...

I have a bunch of navigation properties that each have the TypeConverter attribute attached to the relevant partial classes to be able to perform combobox lookups in a PropertyGrid. I needed to be able to find out the ObjectContext from the context.Instance passed in at GetStandardValues so I could do the lookup.

My initial solution was to create a static property in my application that returned the ObjectContext but after lots of reading on EF4 (I am new to it) I have come to the conclusion it is not wise to keep the ObjectContext alive for the life of the application.

So I wanted to create an ObjectContext per form and dispose it when the form closes, but then had no way to access the same ObjectContext for lookup queries for the navigation properties. And I could not create a new one as you get the good old "different contexts" when a user selects a different item from the combobox.

But... Now all is working perfect. You solution is perfect. Thanks BIG time :)

re: Tip 24 – How to get the ObjectContext from an Entity

Manoj — Mon, 28 Dec 2009 21:15:11 GMT

A related issue is that once an entity is detached from context, it loses all the relationship. This is due to the fact that the relationships are tightly coupled to EF. Hopefully EF2 addresses this in a more POCO-friendly fashion.

re: Tip 24 – How to get the ObjectContext from an Entity

AlexY — Fri, 11 Sep 2009 22:56:45 GMT

Thanks a lot for your tips.

I realy enjoy your blog.

Easy Peasy is not not sometimes easy ;-)

re: Tip 24 – How to get the ObjectContext from an Entity

Alex D James — Fri, 12 Jun 2009 00:23:51 GMT

Bingo

We are thinking about adding something, probably a static method on ObjectContext

i.e.

ObjectContext context = ObjectContext.GetContext(entity);

But we need to weigh that up against a lot of other competing ideas, so it might not make it.

Alex

re: Tip 24 – How to get the ObjectContext from an Entity

Bingo — Fri, 12 Jun 2009 00:11:07 GMT

Hi,

Will the next release (.NET 4??) of Entity Framework provide this in a more fundamental fashion.

Maybe as a property like EntityObject.ObjectContext?

Meta-Me : Entity Framework Tips

Meta-Me : Entity Framework Tips — Mon, 08 Jun 2009 21:44:09 GMT

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