Professional LINQ

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Scott Klein

"Professional LINQ"

Overview
Standard query operators are the building blocks of LINQ query expressions, providing many of
the query capabilities such as filtering and sorting. They are a set of methods that constitute a query
pattern and are implemented by their respective LINQ provider, such as LINQ to XML and LINQ
to Datasets.
As you learned in the last chapter, some operators return results immediately, while others have a
deferred execution. Those queries whose execution is immediate return a single value such as a Sum
or Count, while those queries that have a deferred execution return multiple values.
As stated earlier, the standard query operator is a set of methods. These methods operate on
sequences. A sequence is an object whose type implements either the IEnumerable interface or
Part I: Introduction to Project LINQ
the IQueryable interface. The IEnumerable interface provides iteration over a collection
of a specified type.
The IQueryable interface provides the ability to execute queries against a known and specific data
source whose type of data is known.

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Scott Klein

"Professional LINQ"