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Programming Entity Framework_DbContext
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清晰版 Programming Entity Framework_DbContext
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Programming Entity Framework:
DbContext
Julia Lerman and Rowan Miller
Beijing
•
Cambridge
•
Farnham
•
Köln
•
Sebastopol
•
Tokyo
Programming Entity Framework: DbContext
by Julia Lerman and Rowan Miller
Copyright © 2012 Julia Lerman and Rowan Miller. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions
are also available for most titles (http://my.safaribooksonline.com). For more information, contact our
corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com.
Editors: Meghan Blanchette and
Rachel Roumeliotis
Production Editor: Teresa Elsey
Cover Designer: Karen Montgomery
Interior Designer: David Futato
Illustrators: Robert Romano and Rebecca Demarest
Revision History for the First Edition:
2012-02-23 First release
See http://oreilly.com/catalog/errata.csp?isbn=9781449312961 for release details.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of
O’Reilly Media, Inc. Programming Entity Framework: DbContext, the image of a great African heron,
and related trade dress are trademarks of O’Reilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as
trademarks. Where those designations appear in this book, and O’Reilly Media, Inc., was aware of a
trademark claim, the designations have been printed in caps or initial caps.
While every precaution has been taken in the preparation of this book, the publisher and authors assume
no responsibility for errors or omissions, or for damages resulting from the use of the information con-
tained herein.
ISBN: 978-1-449-31296-1
[LSI]
1330008698
Table of Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1. Introducing the DbContext API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Getting the DbContext API into Your Project 2
Looking at Some Highlights of the DbContext API 3
Reducing and Simplifying Ways to Work with a Set 5
Retrieving an Entity Using ID with DbSet.Find 5
Avoiding Trolling Around the Guts of Entity Framework 6
Working with the BreakAway Model 6
Getting the Sample Solution 6
Getting DbContext from an EDMX Model 8
Ensuring DbContext Instances Get Disposed 11
2. Querying with DbContext . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Writing Queries with LINQ to Entities 13
Querying All the Data from a Set 16
Using LINQ for Sorting, Filtering, and More 18
Finding a Single Object 21
Querying Local Data 24
Using the Load Method to Bring Data into Memory 26
Running LINQ Queries Against Local 27
Working with the ObservableCollection Returned by Local 29
Loading Related Data 30
Lazy Loading 31
Eager Loading 33
Explicit Loading 36
Checking If a Navigation Property Has Been Loaded 38
Querying Contents of a Collection Navigation Property 39
Explicit Loading a Subset of the Contents of a Navigation Property 41
iii
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- wangmk2013-05-08正要在项目中使用,很好的参考资料。谢谢分享
zhujiazhao123
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