C Sharp Var data type and Anonymous Type: An Overview

Understand how the var keyword and anonymous types work in C#, including when and why to use implicit typing in your code.

What is the var Keyword?

The var keyword allows the compiler to infer a variable's type automatically based on the value assigned to it at declaration, reducing verbosity while still keeping the code strongly typed under the hood.

When to Use var

var is especially useful when working with complex generic types, such as those returned by LINQ queries, where explicitly writing out the full type name would make the code harder to read.

What is an Anonymous Type?

An anonymous type lets you create an object with a set of read-only properties without explicitly defining a class, using syntax like new { Name = 'John', Age = 25 }, which the compiler generates a type for behind the scenes.

Common Use Cases

Anonymous types are frequently used in LINQ queries to shape or project data into a temporary structure containing only the fields you need, without the overhead of creating a dedicated class.