LINQ provides a straightforward yet expressive SQL-like syntax with which you can query an Entity Data Model and uses anonymous types to return strongly-typed results.
by Thiru Thangarathinam
January 10, 2007
he previous article in this series introduced the core concepts of Object Services Layer, including the steps to perform CRUD (Create, Read, Update and Delete) operations against the Entity Data Model (EDM). With that foundation, this installment focuses on using LINQ to query the EDM. Specifically, this article focuses on the expressive query capabilities of LINQ in querying the EDM through the object services layer. By using LINQ on top of the EDM, you can perform operations such as sorting, joining multiple tables, projecting result sets and so on.
Figure 1. Using LINQ on top of ADO.NET Object Services Layer: The figure shows the role of the LINQ framework in the overall architecture of ADO.NET vNext.
Figure 1 shows how client applications can work with the object services layer either through LINQ or Entity SQL.
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