C# 5.0 Programmer's Reference

J
LINQ
This appendix provides syntax summaries for the most useful LINQ methods. For more
detailed information, see Chapter 8, “LINQ.”
Basic LINQ Query Syntax
The following text shows the typical syntax for a LINQ query.
from ... where ... orderby ... select ...
The following sections describe these four standard clauses. The sections after those describe
some of the other most useful LINQ clauses.
from
The from clause tells where the data comes from and defines the name by which it is known
within the LINQ query.
Examples:
from queryVariable in dataSource
var customerQuery =
from person in customers
select person;
var scoresQuery =
from student in students
from score in testScores
where student.StudentId == score.StudentId
select new {student, score};
Usually, if you select data from multiple sources, you will want to use a where clause to join
the results from the sources.
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