public static void Main()
{
var p = new Person() { Name = "Luke", Age = 50 };
WriteLine(string.Format("{0} is {1} year{{s}} old", p.Name, p.Age));
WriteLine($"{p.Name} is {p.Age} year{{s}} old");
WriteLine($"{p.Name,20} is {p.Age:D3} year{{s}} old");
WriteLine($"{p.Name} is {p.Age} year{(p.Age == 1 ? "" : "s")} old");
}
public static void Main()
{
// Use ?. to access the Name property
Person person = null;
Console.WriteLine("person?.Name: {0}", person?.Name ?? "null");
List<Person> persons = null;
Console.WriteLine("persons?[0].Name: {0}", persons?[0].Name ?? "null");
person = new Person() { Name = "Luke" };
Console.WriteLine("person?.Name: {0}", person?.Name ?? "null");
persons = new List<Person>() { person };
Console.WriteLine("persons?[0].Name: {0}", persons?[0].Name ?? "null");
// Use ?. to raise the PropertyChanged event
Console.WriteLine();
person.PropertyChanged += PersonPropertyChanged;
person.Name = "Han";
}
