Lambda Expressions in C#

Lambda expressions in C# provide a concise way to represent anonymous methods. They are essentially a shorthand syntax for creating delegates and are commonly used to pass behavior as parameters. The lambda operator (=>) separates input parameters (left side) from the expression or statements (right side).

Types of Lambda Expressions

1. Expression Lambda

Represents a single expression that returns a value.

Syntax:

input => expression;

2. Statement Lambda

Represents a block of statements enclosed in braces.

Syntax:

input => { statements };

Example 1: Lambda Expressions with Collections

In the below example, a list of integers is processed using lambda expressions to calculate the square of each element and filter numbers divisible by 3.

The list: 36 71 12 15 29 18 27 17 9 34 
Squares: 1296 5041 144 225 841 324 729 289 81 1156 
Numbers Divisible by 3: 36 12 15 18 27 9 

Example 2: Using Lambda Expressions with User-defined Classes

Lambda expressions can also be used with custom objects. The following example sorts a list of students by name using a lambda expression.

1 Liza
4 Stefani
2 Stewart
3 Tina
5 Trish

Note: Sorting rearranges the order of objects in the list based on the specified condition (Name). The RollNo values remain unchanged and stay associated with their respective student objects.