Schweitzer Fachinformationen
Wenn es um professionelles Wissen geht, ist Schweitzer Fachinformationen wegweisend. Kunden aus Recht und Beratung sowie Unternehmen, öffentliche Verwaltungen und Bibliotheken erhalten komplette Lösungen zum Beschaffen, Verwalten und Nutzen von digitalen und gedruckten Medien.
Your Complete Example-Rich Guide to Using and Extending LINQ to Objects and PLINQ
Using LINQ to Objects, .NET developers can write queries over object collections with the same deep functionality that was once available only with SQL and relational databases. Now, for the first time, developers have a comprehensive and authoritative guide to applying LINQ to Objects in real-world software. Microsoft MVP Troy Magennis introduces state-of-the-art techniques for working with in-memory collections more elegantly and efficiently-and writing code that is exceptionally powerful, robust, and flexible.
Drawing on his unsurpassed experience coding software using LINQ and hosting the popular HookedOnLINQ.com site, Magennis presents timely, realistic solutions to a wide spectrum of development challenges, such as combining data from multiple sources, and achieving optimal performance with extremely large sets of data. You'll begin with brief quick-starts that walk you through LINQ to Objects' key features and query syntax. Next, you'll drill down to detailed techniques for applying and extending these features with C# 4.0 and C# 3.0-including code examples that reflect the realities of production development.
Coverage includes
Troy Magennis is a Microsoft C# MVP and a keen traveler who currently works for Travelocity, which manages the travel and leisure websites travelocity.com, lastminute.com, and zuji. As Vice President of Architecture, he leads a talented team of architects spread across four continents, committed to being the traveler's champion. Technology has always been a passion. After cutting his teeth on early 8-bit personal computers, Troy moved into electronic engineering (assembly language coding), which later led to positions in software application development and architecture for some of the most prominent corporations in automotive, banking, and online commerce. Troy's first exposure to LINQ was in 2006 when he took a sabbatical to learn it and became hooked, ultimately leading him to publish the popular HookedOnLINQ website.
Foreword . . . x
Preface . . . xii
Acknowledgments . . . xix
About the Author . . . xx
Chapter 1: Introducing LINQ . . . 1
What Is LINQ? . . . 1
The (Almost) Current LINQ Story . . . 3
LINQ Code Makeover-Before and After Code Examples . . . 5
Benefits of LINQ . . . 12
Summary . . . 15
References . . . 15
Chapter 2: Introducing LINQ to Objects . . . 17
LINQ Enabling C# 3.0 Language Enhancements . . . 17
LINQ to Objects Five-Minute Overview . . . 30
Summary . . . 39
References . . . 39
Chapter 3: Writing Basic Queries . . . 41
Query Syntax Style Options . . . 41
How to Filter the Results (Where Clause) . . . 49
How to Change the Return Type (Select Projection) . . . 54
How to Return Elements When the Result Is a Sequence (Select Many) . . . 59
How to Get the Index Position of the Results . . . 61
How to Remove Duplicate Results . . . 62
How to Sort the Results . . . 63
Summary . . . 73
Chapter 4: Grouping and Joining Data . . . 75
How to Group Elements . . . 75
How to Join with Data in Another Sequence . . . 93
Summary . . . 119
Chapter 5: Standard Query Operators . . . 121
The Built-In Operators . . . 121
Aggregation Operators-Working with Numbers . . . 123
Conversion Operators-Changing Types . . . 131
Element Operators . . . 144
Equality Operator-SequenceEqual . . . 153
Generation Operators-Generating Sequences of Data . . . 155
Merging Operators . . . 159
Partitioning Operators-Skipping and Taking Elements . . . 160
Quantifier Operators-All, Any, and Contains . . . 164
Summary . . . 171
Chapter 6: Working with Set Data . . . 173
Introduction . . . 173
The LINQ Set Operators . . . 174
The HashSet Class . . . 185
Summary . . . 192
Chapter 7: Extending LINQ to Objects . . . 195
Writing a New Query Operator . . . 195
Writing a Single Element Operator . . . 196
Writing a Sequence Operator . . . 208
Writing an Aggregate Operator . . . 216
Writing a Grouping Operator . . . 222
Summary . . . 232
Chapter 8: C# 4.0 Features . . . 233
Evolution of C# . . . 233
Optional Parameters and Named Arguments . . . 234
Dynamic Typing . . . 243
COM-Interop and LINQ . . . 251
Summary . . . 260
References . . . 260
Chapter 9: Parallel LINQ to Objects . . . 261
Parallel Programming Drivers . . . 261
Multi-Threading Versus Code Parallelism . . . 264
Parallelism Expectations, Hindrances, and Blockers . . . 267
LINQ Data Parallelism . . . 271
Writing Parallel LINQ Operators . . . 289
Summary . . . 301
References . . . 301
Glossary . . . 303
Index . . . 307
Dateiformat: PDFKopierschutz: Wasserzeichen-DRM (Digital Rights Management)
Systemvoraussetzungen:
Das Dateiformat PDF zeigt auf jeder Hardware eine Buchseite stets identisch an. Daher ist eine PDF auch für ein komplexes Layout geeignet, wie es bei Lehr- und Fachbüchern verwendet wird (Bilder, Tabellen, Spalten, Fußnoten). Bei kleinen Displays von E-Readern oder Smartphones sind PDF leider eher nervig, weil zu viel Scrollen notwendig ist. Mit Wasserzeichen-DRM wird hier ein „weicher” Kopierschutz verwendet. Daher ist technisch zwar alles möglich – sogar eine unzulässige Weitergabe. Aber an sichtbaren und unsichtbaren Stellen wird der Käufer des E-Books als Wasserzeichen hinterlegt, sodass im Falle eines Missbrauchs die Spur zurückverfolgt werden kann.
Weitere Informationen finden Sie in unserer E-Book Hilfe.
