Returning IQueryable vs. ObjectQuery when using LINQ to Entities?

My repositories always returns IQueryable. The reason for this is that IQueryable is not dependent on EF whereas ObjectQuery is. So if I want my other layers to be persistance ignorant I don't want to introduce dependency on ObjectQuery ObjectQuery is implementation of IQueryable with several additional features.

First feature you will quickly discover is Include function which is need for eager loading of navigation properties (related entities). Second feature is EQL - entity query language. EQL is second way how you can query your conceptual model.It has similar syntax as SQL.

You can write simple query as string, pass it to ObjectQuery constructor and execute query or use it in Linq-To-Entities.

My repositories always returns IQueryable. The reason for this is that IQueryable is not dependent on EF whereas ObjectQuery is. So if I want my other layers to be persistance ignorant I don't want to introduce dependency on ObjectQuery.

ObjectQuery is implementation of IQueryable with several additional features. First feature you will quickly discover is Include function which is need for eager loading of navigation properties (related entities). Second feature is EQL - entity query language.

EQL is second way how you can query your conceptual model. It has similar syntax as SQL. You can write simple query as string, pass it to ObjectQuery constructor and execute query or use it in Linq-To-Entities.

Thanks again – mark smith Sep 4 '10 at 21:15 No you don't need to cast. – Ladislav Mrnka Sep 4 '10 at 21:19 Thanks great! Just what I needed!

– mark smith Sep 4 '10 at 22:11.

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