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.NET Language Integrated Query

Yishai Zaltzberg

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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 ?

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Classic ADO.NET

SqlConnection conn = new SqlConnection(“...“);SqlCommand cmd = 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"]);}

Application

Relational Database

No intellisence

No compile time checks

Untyped Results

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.NET Language Integrated Query

XMLObjects Relational Data

LINQ to

XML

LINQ to

Objects

LINQ to

Dataset

LINQ to

Entities

LINQ to

SQL

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Samples

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Simple Xml Build – Before LINQ

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Simple Xml Build

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Before LINQ

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Build Xml from DB