How can I use LINQ to filter a list in C#?

How can I use LINQ to filter a list in C#?

You can use the Where method in LINQ to filter a list. For example, if you have a list of integers and want to filter out even numbers, you can do this: var evenNumbers = numbers.Where(n => n % 2 == 0);

Can you show me a complete example?

Sure! Here's a complete example:

List<int> numbers = new List<int> { 1, 2, 3, 4, 5, 6 };
var evenNumbers = numbers.Where(n => n % 2 == 0).ToList();
Console.WriteLine(string.Join(", ", evenNumbers)); // Output: 2, 4, 6

What if I want to filter based on a condition in a custom object?

You can still use Where with custom objects. For example, if you have a list of Person objects and want to filter by age:

List<Person> people = new List<Person> { new Person { Name = "Alice", Age = 30 }, new Person { Name = "Bob", Age = 20 } };
var adults = people.Where(p => p.Age >= 21).ToList();