x0013 linq and c morebook vn 8492
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (127.36 KB, 7 trang )
A new way and language to query data
28 JUNI 2006 | © CLASS-A
Overview
•
What is Linq?
•
Flavors of Linq
• Linq to XML
• Linq to DataSets
ã Linq to SQL
28 JUNI 2006 | â CLASS-A
ã
Linq under the covers
•
Linq deferred
•
Q&A and/or Discussion
2
Introducing…
•
Alex Thissen
• Trainer/coach
• Weblog at
•
INETA
• Next step in user group evolution
• By and for user group community
•
Class-A
• Knowledge provider
• Training and coaching on Microsoft development
• www.class-a.nl
28 JUNI 2006 | © CLASS-A
3
What is Linq?
•
Linq stands for Language Integrated Query
•
New set of keywords in C# 3.0 and VB.NET 9.0
to express queries over data
IEnumerable<Match>
Dim
homeMatchesWon As
homeMatchesWon
IEnumerable(Of
= Match) =
from m In
From
in matches
where m.GoalsHome > m.GoalsAway
Where
order By
Order
by m.HomeTeam, m.AwayTeam Descending
descending
select m
Select
m;
28 JUNI 2006 | © CLASS-A
4
Linq project
Languages
C# 3.0 VB 9.0 Other
Linq
Standard Query Operators
Linq to Linq to Linq to Linq to
Linq to
Objects XML
SQL
DataSets Entities
28 JUNI 2006 | © CLASS-A
5
Review
•
Linq == querying from programming language
•
C# 3.0 was created to make Linq happen
•
Several applications of Linq exist
• Linq to Objects, XML, DataSets, SQL, Entities
• More to come in the future
•
28 JUNI 2006 | © CLASS-A
Linq approaches functional programming
57
28 JUNI 2006 | © CLASS-A
