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Getting Started with LINQ in C#

What Are Lambda Expressions?

Explore the basics of lambda expressions and delegates in C#, including Func and Action types. Understand how to declare and use them in methods, and see how lambda expressions simplify passing functions in LINQ queries.

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To work with LINQ, we need to be comfortable with delegates and lambda expressions. Let’s learn about them, starting with delegates.

What are delegates?

A delegate is a variable that references a method instead of a value or an object. In LINQ, Func and Action are the two built-in delegate types. We will be using Func a lot with LINQ.

The difference between Func and Action is the return type of the method they point to. The Action type references a void method. In other words, it references a method without return type. Conversely, Func references a method with a return type.

Let’s look at some Func and Action declarations.

  • Action<Movie> holds a method that receives Movie as a parameter and
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