Expression does not work in Include in Entity Framework

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Expression does not work in Include in Entity Framework

Asked 10 years, 3 months ago

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I tried to make the following expression

var listag = db.grupo.Include(x => x.Itens).ToList();

It doesn’t work that way, but if I pass that way:

db.grupo.Include("Itens").ToList();, So it works, why? What am I doing wrong?

Don’t compile that way

– Rod

2014/08/18 at 15:38
Which error, using the first way?

– Leonel Sanches da Silva

2014/08/18 at 15:42
he doesn’t even recognize the expression in the visual studio

– Rod

2014/08/18 at 15:44
Error 5 Cannot Convert lambda Expression to type 'string' because it is not a delegate type

– Rod

2014/08/18 at 15:45
It worked well using System.Data.Entity, thank you =)

– Rod

2014/08/18 at 15:59
@Tiagosilva Do you want to answer? Just so you don’t open the question.

– Leonel Sanches da Silva

2014/08/18 at 16:15

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by Leonel Sanches da Silva • **88,623** points · Answer 1 · 2014-08-18T16:23:44+00:00

The implementation of Include() using a delegate type is in the namespace System.Data.Entity for the Entity Framework case, or System.Linq, if you were using Linq, which is not your case.

As pointed out by @Tiagosilva in comment, check out the header of Controller whether it has the following statements:

using System.Data;
using System.Data.Entity;