Language Integrated Query

Mike TaultyDeveloper & Platform GroupMicrosoft LtdMike.Taulty@microsoft.com http://www.mtaulty.com

Why do we need LINQ?

My Code

“API”

SQL XML

Query As String Loosely typed result

Objects

Language Integrated Query

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

Automatic Properties

VB9

LINQ in the Languages

Some are enablers for LINQ

C# 3.0

Collection Initialisers

Partial Methods

Automatic Properties

LINQ Language Features

Query Pattern -> Language Features

Query Pattern -> Language Features

Compiler looks for extension methods which extend

IEnumerable<T> IQueryable<T>

IEnumerable<T> & IQueryable<T>

IEnumerable – query executed piece by piece

IQueryable – query executed in one go

whereselect

Capture & Execute

Execute Execute

where select

LINQ in VS2008 & Fx 3.5

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

LINQ to Entities

Summary

LINQ plumbed into VB9 and C#3.0 LanguagesLots of other language features too

LINQ enabled in .NET Framework V3.5Objects, SQL, XML, DataSet

LINQ enabled post .NET Framework V3.5Entities...

Resources

http://msdn.microsoft.com/vstudio MSDN LINQ Developer Centre

http://tinyurl.com/3e2qpo

ADO.NET Team Bloghttp://blogs.msdn.com/adonet

MSDN in the UK

Visit http://msdn.co.uk NewsletterEventsNugget VideosBlogs

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