Object Initializers in C# 3.0

C# 3.0 includes a new language feature called object initializers.

Object initializers enable you to initialize the state of an object with a single expression that does not require use of parameterized constructors.

Basically, this feature allows you to initialize an object by both creating the object instance (i.e. a new expression) as well as assign values to one or more properties in a single sentence, or to initialize a collection with a set of values to add to it in a single expression.

    class Program
    {
        static void Main(string[] args)
        {
            Customer cus1 = new Customer() { Name = "Maor", City = "Herzliya" };
            Customer cus2 = new Customer() { Name = "Guy", City = "Ramat Hasharon" };

            List<Customer> customers = new List<Customer>() { cus1, cus2 };

        }
    }

    class Customer
    {
        public string Name { get; set; }
        public string City { get; set; }

    }

The first & the second lines initialize a Customer object with the default constructor (though you could call a constructor with parameters here), and assigns explicit values to the Name and City properties.

The third line initializes a collection of type List<Customer> with the objects cus1 and cus2.

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