C# 7 and .NET Core: Modern Cross-Platform Development - Second Edition

Chapter 9. Querying and Manipulating Data with LINQ

This chapter is about Language Integrated Query (LINQ), a set of language extensions that add the ability to work with sequences of items and then filter, sort, and project them into different outputs.

This chapter covers the following topics:

• Writing LINQ queries
• Working with sets
• Projecting entities with Select
• Sweetening the syntax with syntactic sugar
• Using multiple threads with parallel LINQ
• Creating your own LINQ extension methods
• Working with LINQ to XML

Writing LINQ queries

Although we wrote a few LINQ queries in Chapter 8, Working with Databases Using the Entity Framework Core, I didn't properly explain how LINQ works.

LINQ has several parts; some are required and some are optional:

• Extension methods ...