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 oddNumbers = numbers.Where(n => n % 2 != 0).ToList();

Can you show me a complete example with a list of objects?

Sure! Here's a complete example:

using System;
using System.Collections.Generic;
using System.Linq;

public class Person {
    public string Name { get; set; }
    public int Age { get; set; }
}

class Program {
    static void Main() {
        List<Person> people = new List<Person> {
            new Person { Name = "Alice", Age = 30 },
            new Person { Name = "Bob", Age = 25 },
            new Person { Name = "Charlie", Age = 35 }
        };

        var filteredPeople = people.Where(p => p.Age > 30).ToList();
        foreach (var person in filteredPeople) {
            Console.WriteLine(person.Name);
        }
    }
}

This will output "Charlie".

What if I want to filter by multiple conditions?

You can combine conditions using logical operators. For example:

var filteredPeople = people.Where(p => p.Age > 25 && p.Name.StartsWith("A")).ToList();

This filters for people older than 25 whose names start with 'A'.

Is there a way to sort the filtered results?

Yes! You can chain the OrderBy method after filtering. For example:

var sortedFilteredPeople = people.Where(p => p.Age > 25).OrderBy(p => p.Name).ToList();

This will sort the filtered results by name.