Chapter 21. Querying In-Memory Data by Using Query Expressions

After completing this chapter, you will be able to

  • Define Language-Integrated Query (LINQ) queries to examine the contents of enumerable collections.

  • Use LINQ extension methods and query operators.

  • Explain how LINQ defers evaluation of a query and how you can force immediate execution and cache the results of a LINQ query.

You have now met most of the features of the C# language. However, so far I have glossed over one important aspect of the language that is likely to be used by many applications: the support that C# provides for querying data. You have seen that you can define structures and classes for modeling data and that you can use collections and arrays for temporarily storing ...

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