2008-12-19 Purpose of constructors

2008-12-19 purpose-of-constructors

# Title: Purpose of constructors
# Author: Mikael Lundin
# Link: http://blog.mikaellundin.name/2008/12/20/purpose-of-constructors.html

Example1.cs

Person person = new Person
{
    Firstname = "John",
    Lastname = "Doe",
    Address = new Address
    {
        StreetName = "Last Hope",
        Zip = 42,
        City = "Vladivostok"
    },
    PhoneNumbers = new string[]
    {
        "123-321",
        "+45 234 234",
        "3333333"
    }
};

Example2.cs

public class Person
{
    public int ID { get; set; }
    public string Firstname { get; set; }
    public string Lastname { get; set; }
}

Example3.cs

public class Person
{
    private int id;

    public Person(int id)
    {
        System.Diagnostics.Debug.Assert(id > -1, "Class Person was initialized with ID < 0");
        this.id = id;
    }

    public int ID { get { return this.id; } }
    public string Firstname { get; set; }
    public string Lastname { get; set; }
}