using System;

using System.Collections.Generic;

using System.Linq;

namespace _16AnonymousTypes

{

class Program

{

static void Main(string[] args)

{

//ANONYMOUS TYPES

Console.WriteLine("------------------Anonymous Types------------------");

//Anonymous types are similar to tuples (see project 16Tuples) but are used differently.

//We instantiate an anonymous type using the var keyword.

var myAnonymous = new { Name = "John Smith", Age = 4 };

Console.WriteLine(myAnonymous);

var users = new List<User>()

{

new User()

{

Name = "Test User 1",

Age = 30,

DateOfBirth = new DateTime(1990, 5, 21)

},

new User()

{

Name = "Test User 2",

Age = 55,

DateOfBirth = new DateTime(1965, 3, 10)

}

};

//The most common scenario for anonymous types is in LINQ queries.

//Specifically, LINQ projections:

var results = users.Where(x => x.Age > 40)

.Select(x => new { x.Name, x.Age }); //Anonymous type

foreach (var item in results)

{

Console.WriteLine("Name: " + item.Name + ", Age: " + item.Age);

}

//Anonymous types are immutable (their properties cannot be modified once created)

//and they are not types in the traditional sense. Their type is generated

//by the compiler. Consequently they come with some restrictions

//1. Anonymous types cannot be used as parameters or return values (see 6Methods).

//2. Anonymous types may only have properties; constructors or other methods are not permitted.

//3. Anonymous types inherit from System.Object, and therefore cannot be cast to any other object.

}

}

}