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#

Let's learn how to use the `Any` and `All` methods to check whether a collection has elements or not. Unlike `Select` and `Where`, these two methods don’t return a new collection, but a `boolean` result.

# How to check if a collection has elements

The `Any` method works with and without parameters.

The `Any` method, without parameters, checks if a collection is empty. If a collection has at least one element, the `Any` method returns `true`. But if the collection is empty, it returns `false`.

When we pass a condition to the `Any` method, it checks if a collection has at least one element matching that condition. It also returns either `true` or `false`.

# How to check if all of a collection meets a condition

The `Any` method checks for at least one element in a collection. But what if we want to check for all elements in a collection?

The answer to that question is the `All` method. As its name implies, the `All` method returns `true` only if _every_ element in a collection satisfies a condition. 

Let's find out if we’ve only watched really good movies.

Learn how to filter a collection with the Any and All methods.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

Any and All Methods

How to check if a collection has elements