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Visual Basic 2015 Unleashed
book

Visual Basic 2015 Unleashed

by Alessandro Del Sole
July 2015
Intermediate to advanced content levelIntermediate to advanced
1300 pages
87h 27m
English
Sams
Content preview from Visual Basic 2015 Unleashed

Understanding Deferred Execution

When the Common Language Runtime (CLR) encounters a LINQ query, the query is not executed immediately. LINQ queries are executed only when they are effectively used. This concept is known as deferred execution and is part of all LINQ providers you encounter, both standard and custom ones. For example, consider the query that is an example in the previous discussion:

Dim query = From prod In products            Where prod.UnitsInStock > 10 _            And prod.Discontinued = False            Order By prod.UnitPrice            Select prod

This query is not executed until you effectively use its result.

For example, iterations cause the query to be executed:

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Publisher Resources

ISBN: 9780134196664Purchase book