EntityFramework 4 upgraded to 5, lambda is not available

Question

I have upgraded my "entityframework 4" project to 5. I want to use lambda expression in Include (my motivation is to suplant string definitions) brackets.

At this momemnt I have:

context.WarrantyContract.Include("Car");

And want to achieve this one:

context.WarrantyContract.Include(w => w.Car);

But when I try to replace string, visual studio is not eable to recognize my will.

I'll appreciate any right direction.

ObjectSet and this in the brackets inherits from EnityObject — Martin Majoroš, Jan 25 '13 at 08:47

score 22 · Accepted Answer · answered Jan 25 '13 at 08:45

22

The lambda version of the Include is declared in the System.Data.Entity.DbExtensions class as an extension method.

In order to use it you need to add an using with the right namespace in your file the:

using System.Data.Entity;

//...

context.WarrantyContract.Include(w => w.Car);

answered Jan 25 '13 at 08:45

nemesv

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Enough to add namespace `using System.Data.Entity;`. @nemesv Thanks for the quick help – Martin Majoroš Jan 25 '13 at 08:56

EntityFramework 4 upgraded to 5, lambda is not available

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