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.NET Language Integrated Query

.NET Language Integrated Query. Yishai Zaltzberg. Agenda:. Why LINQ? What is LINQ Code samples Compare to code without LINQ Simple query Working with Xml Aggregation Join Use SP Etc . Impact and performance. Questions ?. Classic ADO.NET. Application.

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.NET Language Integrated Query

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  1. .NET Language Integrated Query Yishai Zaltzberg

  2. Agenda: • Why LINQ? • What is LINQ • Code samples • Compare to code without LINQ • Simple query • Working with Xml • Aggregation • Join • Use SP • Etc. • Impact and performance. • Questions ?

  3. Classic ADO.NET Application SqlConnectionconn = new SqlConnection(“...“); SqlCommandcmd = conn.CreateCommand(); cmd.CommandText = @“ SELECT *                     FROM   Vehicles                     WHERE  Model = @Model"; cmd.Parameters.Add("@Model", “Mercedes“); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[“Number"] + r[“Year"]); } No intellisence No compile time checks Untyped Results Relational Database

  4. LINQ to Objects .NET Language Integrated Query LINQ to Entities LINQ to SQL LINQ to Dataset LINQ to XML XML Objects Relational Data

  5. Samples

  6. Simple Xml Build – Before LINQ

  7. Simple Xml Build

  8. Before LINQ

  9. Build Xml from DB

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