Gain insights into LINQ in C#, learn about lambda expressions, explore common LINQ methods, avoid pitfalls, and refactor code to be more expressive and efficient.

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LINQ is the best feature in C#. If you’re interested in writing more expressive code to work with collections, this course is for you. In this course, you will learn about what LINQ is and what lambda expressions are. You will learn the most common LINQ methods and some common pitfalls to avoid when using LINQ. You will also write your first methods using LINQ and use LINQ to refactor some common constructs.

Getting Started with LINQ in C#

# Key points

Let's review what we learned in this course. These are the main ideas we covered in this course:

* Language-Integrated Query (LINQ) is a set of methods to work with collections in a declarative way.
* LINQ is declarative and immutable.
* A LINQ query isn't evaluated until we iterate over its results.
* We write LINQ queries using lambda expressions.
* LINQ has a query-like syntax with keywords like `from`, `where`, and `select`.
* LINQ has methods to filter and transform collections like `Where` and `Select`. It also has methods to check for the content of collections like `Any` and `All`, to group elements and sort collections like `GroupBy` and `OrderBy`, and to select a subset of collections like `First`, `Last`, `Take`, and `Skip`.
* We can pass a condition directly to some LINQ methods instead of first filtering with `Where`.
* With LINQ, we can refactor conditionals and object validation.
* In .NET 6, LINQ has new methods like `Chunk` and `DistinctBy`, new overloads like `Take` with ranges, and `FirstOrDefault` with custom defaults.

Although we covered lots of subjects related to LINQ, we didn't cover every single LINQ method available. We typically use only a few LINQ methods for 80% of the scenarios. The next time you have to work with collections in C#, remember you can write cleaner code with LINQ.

_Happy coding!_

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

Conclusion

Key points