What are some useful collection extensions in C#?

What are some useful collection extensions in C#?

C# provides several collection extensions in the System.Linq namespace. For example, methods like .Select(), .Where(), and .ToList() are very useful.

Can you explain how the .Select() method works?

.Select() projects each element of a collection into a new form. For instance, you can use it to transform a list of integers into their squares.

Can you give me a code example of using .Select()?

Sure! Here's a simple example:

var numbers = new List<int> { 1, 2, 3, 4, 5 };
var squares = numbers.Select(n => n * n).ToList();

This will give you a list of squares: 1, 4, 9, 16, 25.

What about the .Where() method?

.Where() filters a collection based on a predicate. For example, you can use it to get all even numbers from a list.