C# 3.0 Language Extensions

Put together a little snippet to remind myself of the some of the beautiful language extensions that shipped with the C# language.

namespace CSharpLanguageExperiment
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    class Program
    {
        static void Main(string[] args)
        {
            // Object Initialiser
            Person bill = new Person { FirstName = “Bill”, LastName = “Gates”, Age = 40 };

            // Type Inference
            var ben = new Person { FirstName = “Ben”, LastName = “Simmonds”, Age = 25 };

            // Anonymous Types
            var john = new { FirstName = “John”, LastName = “Smith”, Age = 18 };

            // Anonymous Delegate
            Func<string, bool> filter1 = delegate(string name)
            {
                return name.Length > 4;
            };
            filter1(“hel”);

            // Lambda Expression
            Func<string, bool> filter2 = x => x.Length > 4;
            filter2(“foobar”);

            // Extension Method
            ben.GetData();

            // Queries
            List<Person> people = new List<Person>();
            people.Add(bill);
            people.Add(ben);
            Func<Person, bool> filter = x => x.Age > 30;
            IEnumerable<Person> exp = people.Where(filter);

            foreach (Person person in exp)
            {
                Console.WriteLine(person.GetData());
            }
        }
    }

    public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }

        public override string ToString()
        {
            return String.Format(“{0} {1}”,
                FirstName,
                LastName);
        }
    }

    // Extension Method
    public static class PersonExtension
    {
        public static string GetData(this Person person)
        {
            return String.Format(“Name: {0} {1} Age: {2}”,
                person.FirstName,
                person.LastName,
                person.Age);
        }
    }
}