C# 6 Features: Auto-Property Initializer Examples

Auto-Properties_Before.cs

public class Person
{
  public Guid PersonId { get; set; }
  public string FirstName { get; set; }
  public string LastName { get; set; }
}
 
public class Program
{
  public static void Main()
  {
    var person = new Person
      {
        FirstName = "Joe",
        LastName = "Reynolds"
      };
    if(person.PersonId == Guid.Empty) Console.WriteLine("PersonId was not set");
    else Console.WriteLine($"New Person ID: {person.PersonId}");
    Console.WriteLine($"New Name: {person.FirstName} {person.LastName}");
  }
}

Auto-Property-Initializer.cs

public class Person
{
  public Guid PersonId { get; set; } = Guid.NewGuid();
  public string FirstName { get; set; }
  public string LastName { get; set; }
}

ConstructorInit.cs

public class Person
  {
    public Guid PersonId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
     
    public Person()
    {
      PersonId = Guid.NewGuid();
    }
}

RuntimeInitialization.cs

public static void Main()
{
  var person = new Person
  {
    FirstName = "Joe",
    LastName = "Reynolds",
    PersonId = Guid.NewGuid()
  };
  // snip
}