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.

dotnet6.tar.gz

dotnet6job

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#

Now, let's rewrite our example to find our favorite movies. We’ve decided a movie is a favorite if it has a rating greater than 4.5 points.

# How to filter a collection with `Where`

To start using LINQ methods, let's add the statement `using System.Linq` to our `using` declarations at the top of our file. Next, we want to filter our favorite movies, the ones with a rating greater than 4.5. The LINQ method `Where` filters and returns a new collection with all the elements that meet a condition.

Let's replace the first `foreach` statement from our first example with the `Where` method. Then let's keep the same `IsFavorite()` method to find if a movie has a rating that makes it a favorite film. Our example looks like this:

Learn how to filter a collection with Where.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

How to Use the Where Method

How to filter a collection with `Where`

How to Use the Where Method

How to filter a collection with Where

How to filter a collection with `Where`