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#

## The `IEnumerable` type

LINQ is a set of extension methods on the `IEnumerable` type. The `IEnumerable` type represents objects we can loop through like arrays, lists, dictionaries, and others.

The `IEnumerable` type has a `GetEnumerator()` method. It returns an `IEnumerator`. With this `IEnumerator` we can iterate over collections, since it has a `MoveNext` method and a `Current` property. The `MoveNext` method _moves_ the enumerator to the next position, and the `Current` property holds the element at the given position.


# The `IEnumerable` type

LINQ is a set of extension methods on the `IEnumerable` type. The `IEnumerable` type represents objects we can loop through like arrays, lists, dictionaries, and others.

The `IEnumerable` type has a `GetEnumerator()` method. It returns an `IEnumerator`. With this `IEnumerator` we can iterate over collections, since it has a `MoveNext` method and a `Current` property. The `MoveNext` method _moves_ the enumerator to the next position, and the `Current` property holds the element at the given position.


Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

LINQ and IEnumerable Type

The `IEnumerable` type