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"; }