Language Integrated Query Mike Taulty Developer & Platform Group Microsoft Ltd

Agenda Why do we want LINQ? How are query capabilities added to the languages? What is LINQ enabled in VS2008 & Fx 3.5? What is LINQ enabled after VS2008?

Why do we need LINQ? My Code “API”  SQL XML Query As String Loosely typed result Objects

Language Syntax for Querying

LINQ brings us closer to data

VB9 LINQ in the Languages Many new language features in VB9 & C# 3 XML Literals Relaxed Delegates C# 3.0 Extension Methods Object Initialisers Anonymous Types Implicit Typing Lambdas Collection Initialisers Partial Methods

VB9 LINQ in the Languages Some are enablers for LINQ C# 3.0 Collection Initialisers XML Literals Relaxed Delegates Partial Methods

LINQ Language Features

Query Pattern -> Language Features

Compiler looks for extension methods which extend IEnumerable IQueryable

IEnumerable & IQueryable IEnumerable – query executed piece by piece IQueryable – query executed in one go where select Capture & Execute Execute where select

LINQ in VS2008 & Fx 3.5 LINQ Objects (IE) XML (IE) SQL (IQ) DataSet (IE)

LINQ to SQL, XML and DataSet

Beyond VS 2008 – ADO.NET V3.0 DataStore (SQL, Oracle, etc) ADO.NET Provider (e.g. SqlClient, OracleClient, etc) ADO.NET V2.0 ADO.NET Entity Provider (EntityClient) Conceptual Data Model Query with LINQ to Entities, Entity SQL ADO.NET V3.0 & Entity Framework Mapping

LINQ to Entities

Summary LINQ plumbed into VB9 and C#3.0 Languages Lots of other language features too LINQ enabled in.NET Framework V3.5 Objects, SQL, XML, DataSet LINQ enabled post.NET Framework V3.5 Entities...

Resources MSDN LINQ Developer Centre ADO.NET Team Blog

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