Jr. Joseph C. Rattz's LINQ : Language Integrated Query en C# 2008 PDF

By Jr. Joseph C. Rattz

ISBN-10: 2744023078

ISBN-13: 9782744023071

LINQ is the venture identify for a collection of extensions to the .NET Framework that supply a wide-spread method of querying information from diversified information assets. LINQ will best in visible Studio 2008, and may turn into the following must–have ability for .NET builders. for additional information approximately LINQ, you could try out the author’s portal at www.LINQdev.com.

Pro LINQ: Language built-in question in C# 2008 is all approximately code.

Literally, this ebook begins with code and ends with code. In so much books, the writer exhibits the best instance demonstrating the way to use a style, yet they so hardly express easy methods to use the extra advanced prototypes. Pro LINQ: Language built-in question in C# 2008 is varied. Demonstrating the overpowering majority of LINQ operators and protoypes, it's a veritable treasury of LINQ examples.

Rather than vague the appropriate LINQ rules in code examples by means of concentrating on an indication program you don't have any curiosity in writing, Pro LINQ: Language built-in question in C# 2008 cuts correct to the chase of every LINQ operator, process, or type. even though, the place complexity is important to actually show a subject, the examples are correct there within the thick of it. for instance, code samples demonstrating the best way to deal with concurrency conflicts truly create concurrency conflicts so that you can step throughout the code and notice them unfold.

Most books inform you concerning the easy stuff, whereas few books provide you with a warning of the pitfalls. the place Pro LINQ: Language built-in question in C# 2008 returns your funding is within the hours, and infrequently days, spent through the writer picking why whatever would possibly not paintings as anticipated. occasionally this leads to an blameless having a look paragraph that can take you a minute to learn and comprehend, yet took days to analyze and explain.

Face it, such a lot technical books whereas informative, are uninteresting. LINQ don't need to be boring. Written with a feeling of humor, Pro LINQ: Language built-in question in C# 2008 will try to entertain you in your trip in the course of the wonderland of LINQ and C# 2008.

What you’ll learn

  • How to leverage all of the LINQ-relevant C# 2008 language beneficial properties together with extension tools, lambda expressions, nameless info kinds, and partial tools.
  • How to take advantage of LINQ to things to question in–memory information collections comparable to arrays, ArrayLists, and Lists to retrieve the knowledge you will have.
  • Why a few queries are deferred, how a deferred question can chew you, and the way you may make deferred queries give you the results you want.
  • How to take advantage of LINQ to XML to revolutionize your construction, manipulation, and looking of XML information.
  • How to question DataSets with LINQ to DataSet so that you can co–exist with legacy code and use LINQ to question databases except SQL Server.
  • How to question Databases with LINQ to SQL, write your individual entity periods, and know the way to deal with concurrency conflicts.

Who this e-book is for

This ebook is written for the expert C# developer, yet you don't want to be up on all of the most modern C# good points to appreciate the cloth.

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Additional resources for LINQ : Language Integrated Query en C# 2008

Sample text

Vous pourriez par exemple créer la méthode statique d’extension ToDouble dans la classe statique StringConversions. Cette méthode serait appelée comme s’il s’agissait d’une méthode d’un objet de type string. book Page 32 Mercredi, 18. février 2009 7:58 07 32 LINQ et C# 2008 Partie I Avant d’entrer dans le détail des méthodes d’extension, nous allons nous intéresser au problème qui leur a donné naissance. Nous allons comparer les méthodes statiques (class) aux méthodes d’instance (object). Les méthodes d’instance peuvent seulement être appelées dans les instances d’une classe, aussi appelées objets.

0, les développeurs peuvent faire appel aux méthodes anonymes, afin de passer du code comme argument et ainsi d’éviter l’utilisation de délégués. book Page 22 Mercredi, 18. 2). 2 : Appel du filtre par l’intermédiaire d’une méthode anonyme. WriteLine(i); Comme vous le voyez, il n’est plus nécessaire de définir une méthode de filtrage. Cette technique est particulièrement intéressante si le code qui remplace le délégué a peu de chances d’être utilisé à plusieurs reprises. Le résultat est bien entendu identique à celui de l’exemple précédent : 1 3 5 7 Les méthodes anonymes ont un inconvénient : elles sont verbeuses et difficiles à lire.

Bien que les opérateurs OfType et Cast soient utilisables sur une collection héritée, Cast nécessite que tous les objets de la collection aient le type attendu. Pour éviter de générer des exceptions en cas d’incompatibilité de type, préférez-lui l’opérateur OfType. Par son intermédiaire, seuls les objets du type spécifié seront stockés dans la séquence IEnumerable, et aucune exception ne sera générée. Le cas échéant, les objets dont le type n’est pas celui attendu ne seront pas convertis. Les requêtes aussi peuvent être boguées Au Chapitre 3, vous verrez que les requêtes LINQ sont souvent différées.

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LINQ : Language Integrated Query en C# 2008 by Jr. Joseph C. Rattz

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