Entity Framework lazy loading

Question

using(DataContext db = new DataContext ())
{
    var result = db.SomeTable.ToList();
    return result;
}

Problem is after i have returned the result, the connection is closed and because its closed, it crashes when i am trying to access any of the child elements. That happens because with lazy loading set to True ( default ) it never loads the child relations before they are used and i start using them AFTER the connection is closed. So how is the best way to solve this?

I have tried to turn off the lazy loading but then it didnt load any of the child relation tables.

score 14 · Accepted Answer · answered Jan 10 '11 at 14:42

14

You can always explicitly load your child collections:

var result = db.SomeTable.Include("SomeChildCollectionName")
                         .Include("AnotherChildCollectionName")
                         .ToList();

answered Jan 10 '11 at 14:42

Justin Niessner

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Ok but what if i want to load ALL child elements without having to explicitly writing include("ElementName") ? There is a lot of child elements , thats why – syncis Jan 10 '11 at 14:49
@user554978 - That isn't supported. You have to explicitly load all the children up front using Include or keep the connection open and allow Lazy Loading to do its thing. – Justin Niessner Jan 10 '11 at 14:50

score 3 · Answer 2 · answered Jan 10 '11 at 14:41

3

You can use the .include() method.

var result = db.SomeTable.Include("ChildEntitySet").ToList();

You can also add a result.ChildEntitySet.Load() call before returning. This is less efficient as it will result in two trips to the server. Using the .Include() method will generate a SQL Statement with a JOIN allowing only one trip to the server.

answered Jan 10 '11 at 14:41

DCNYAM

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Ok but what if i want to load ALL child elements without having to explicitly writing include("ElementName") ? There is a lot of child elements , thats why – syncis Jan 10 '11 at 14:49

Entity Framework lazy loading

2 Answers2

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