linq (from the inside)

Linq (from the inside)

Reinventing the Linq to Objects wheelMike Clement

mike@softwareontheside.com@mdclement

LINQ to AmazonLINQ to Active DirectoryLINQ to Bindable Sources (SyncLINQ)LINQ to C# projectLINQ to Continuous Data (CLinq)LINQ to CRMLINQ To Geo - Language Integrated Query for Geospatial DataLINQ to ExcelLINQ to Expressions (MetaLinq)LINQ Extender (Toolkit for building LINQ Providers)LINQ to FlickrLINQ to GoogleLINQ to Indexes (LINQ and i40)LINQ to IQueryable (Matt Warren on Providers)LINQ to JSONLINQ to LDAPLINQ to NHibernateLINQ to JavaScriptLINQ to LLBLGen ProLINQ to LuceneLINQ to Metaweb(freebase)

LINQ to MySQL, Oracle and PostgreSql (DbLinq)LINQ to NCoverLINQ to Opf3LINQ to Parallel (PLINQ)LINQ to RDF FilesLINQ to SharepointLINQ to SimpleDBLINQ to StreamsLINQ to TwitterLINQ to WebQueriesLINQ to WMI

http://tomasp.net/blog/linq-expand.aspxhttp://tomasp.net/blog/linq-expand-update.aspx

Linq To WIQLLINQ to XtraGrid

Source: http://blogs.msdn.com/b/charlie/archive/2006/10/05/links-to-linq.aspx

If I have seen further it is by standing on the shoulders of giants.

-Sir Issac Newton

http://stackoverflow.com/users/22656/jon-skeet

• Jon Skeet is immutable. If something’s going to change, it’s going to have to be the rest of the universe.

• Jon Skeet is the only top 100 SO user who is human. The others are bots that he coded to pass the time between questions.

• Jon Skeet does not use revision control software. None of his code has ever needed revision.

• When Jon Skeet’s code fails to compile, the compiler apologizes.• Jon Skeet is the traveling salesman. Only he knows the shortest

route.• The Dining Philosophers wait while Jon Skeet eats.• When Jon Skeet points to null, null quakes in fear.• Jon Skeet does not use exceptions when programming. He has

not been able to identify any of his code that is not exceptional.

• Jon Skeet has already written a book about C# 5.0.

• It’s currently sealed up.• In three years, Anders Hejlsberg is going to

open the book to see if the language design team got it right

from cust in customerswhere cust.City == "London"select cust;

customers.Where(cust => cust.City == "London");

C# Language Features

• Query Expressions• Implicitly Typed Variables• Object and Collection Initializers• Anonymous Types• Extension Methods• Lambda Expressions• Auto-implemented Properties

• Iterator blocks• Generics

public static void Method(this IInterface myInterface, int i)

Anatomy of an extension method

IMPLEMENT LINQ TO OBJECTSLearning by Doing… we’ll figure it out as we go.

C# Language Features

• Query Expressions• Implicitly Typed Variables• Object and Collection Initializers• Anonymous Types• Extension Methods• Lambda Expressions• Auto-implemented Properties

• Iterator blocks• Generics

Resources

• Classification by Manner of Execution• C# Features• List of Linq Providers (and other links)• EduLinq code blog posts (from Jon Skeet)• MoreLinq (from Jon Skeet)• My Starter Project

– https://github.com/mdclement/Linq--from-the-inside--Presentation-Base

Action Items!

• Read Jon Skeet’s EduLinq series.• Download my “starter” and play!• If you aren’t already, use Linq in your everyday

coding.• Look for other Linq operators to implement.• Attend the Utah Software Craftsmanship

Group!

Me

• @mdclement• mike@softwareontheside.com• http://blog.softwareontheside.com• Utah Software Craftsmanship Group

– https://groups.google.com/forum/#!forum/ut-software-craftsmanship

– @utahsc– First Wednesday, Neumont, Room 300