public void _01()
{
var car01 = new ImmutableVehicle
{
Color = "Red",
Wheels = 4,
};
// 在不修改原对象的基础上, 使用 with 创建一个新的对象, 并更改某些属性的值
var car02 = car01 with {
Color = "Blue"
};
Assert.Equal("Blue", car02.Color);
}
}
static void Main(string[] args)
{
var jeff = new ImmutablePerson {
FirstName = "Jeff",
LastName = "Winger"
};
// jeff.FirstName = "Geoff";
var car = new ImmutableVehicle {
Brand = "Mazda MX-5 RF",
Color = "Soul Red Crystal Metallic",
Wheels = 4
};
var repaintCar = car with {
Color = "Polymetal Grey Metallic"
};
WriteLine("Original color was {0}, new color is {1}.",
arg0: car.Color, arg1: repaintCar.Color);
var oscar = new ImmutableAnimal("Oscar", "Labrador");
var(who, what) = oscar; // calls deconstruct method
WriteLine($"{who} is a {what}.");
}
void UsingPacktLib9()
{
object[] passengers =
{
new FirstClassPassenger {
AirMiles = 1_419
},
new FirstClassPassenger {
AirMiles = 16_562
},
private static void RunRecordsDemo()
{
// work with records
var pavel =
new ImmutablePerson
{
FirstName = "Pavel",
LastName = "Talochka"
};
//init exception, Has to intialize when object create
// pavel.FirstName = "Michail";
var car = new ImmutableVehicle
{
Brand = "BMW",
Color = "Soul Red Crystal Metallic",
Wheels = 4
};
// cloning object
var repaintingCar = car with {
Color = "Pink"
};
WriteLine("Original color of the car is {0}, new color is {1}",
arg0: car.Color,
arg1: repaintingCar.Color);
// immutable animal example
var oscar = new ImmutableAnimal("Oscar", "Labrador");
var(who, what) = oscar;
WriteLine("{0} is a {1}.",
arg0: who,
arg1: what);
}
static void Main(string[] args)
{
Person Olli = new("Olli", new DateTime(1983, 12, 17));
// ------------------------ page 180 - Record short version ------------------------
var kosto = new ImmutableAnimal("Kosto", "Cat");
var(name, species) = kosto;
System.Console.WriteLine($"{name} is a {species}.");
// ------------------------ page 179 - Init / Records ------------------------
var Lenchen = new ImmutablePerson
{
FirstName = "Magdalena",
LastName = "Bergmann"
};
var car = new ImmutableVehicle
{
Wheels = 4,
Brand = "Ford",
Color = "Blue",
};
var repaintedCar = car with {
Color = "Black"
};
// repaintedCar.Color = "Green";
System.Console.WriteLine($"Original color was {car.Color}, repainted color is {repaintedCar.Color}.");
// ------------------------ page 176 - Pattern Matching ------------------------
/*
* object[] passengers = {
* new FirstClassPassenger(){ AirMiles = 1_415},
* new FirstClassPassenger{ AirMiles = 16_562},
* new CoachClassPassenger{ CarryOnKG = 25.3},
* new CoachClassPassenger{ CarryOnKG = 0.3},
* new BusinessClassPassenger(),
* };
*
* foreach (object passenger in passengers)
* {
* decimal fligthCost = passenger switch
* {
* FirstClassPassenger p => p.AirMiles switch
* {
* > 35000 => 1500M,
* > 15000 => 1750M,
* _ => 2000M,
* },
*
* BusinessClassPassenger => 1000M,
*
* CoachClassPassenger p when p.CarryOnKG < 10.0 => 500M,
* CoachClassPassenger => 650M,
* _ => 800M,
* };
*
* System.Console.WriteLine($"Flight costs {fligthCost:C} for {passenger}");
* }
* //*/
// ------------------------ page 172 - Properties and Indexers ------------------------
/*
* System.Console.WriteLine(Olli.Origin);
* System.Console.WriteLine(Olli.Age);
* try
* {
* Olli.FavoritPrimaryColor = "yello";
*
* }
* catch (Exception e)
* {
* System.Console.WriteLine(e.Message);
* }
* System.Console.WriteLine(Olli.FavoritPrimaryColor);
*
* Olli.Children.Add(new Person("child1"));
* Olli.Children.Add(new Person("child2"));
* Olli.Children.Add(new Person("child3"));
* System.Console.WriteLine(Olli.Children[4]);
*/
// ------------------------ page 167 - parameter passing ------------------------
/*
* int a = 10;
* int b = 20;
* int c = 30;
* System.Console.WriteLine($"Before: a = {a}, b = {b}, c = {c}");
* Olli.PassingParameters(a, ref b, out c);
* System.Console.WriteLine($"After: a = {a}, b = {b}, c = {c}");
*/
// ------------------------ page 165 - method overloading ------------------------
// System.Console.WriteLine(Olli.SayHello("Lena"));
// ------------------------ page 162 - tuple / deconstruct tuple ------------------------
(string, int)fruits = Olli.GetFruit();
/*
* System.Console.WriteLine($"There are {fruits.Item2} {fruits.Item1} ");
* // Deconstruct tuple
* (string fruit, int amount) = Olli.GetFruit();
* System.Console.WriteLine($"{fruit}, {amount}");
*
* var fruitNamed = Olli.GetNamedFruit();
* System.Console.WriteLine($"There are {fruitNamed.Numbers} {fruitNamed.Name}");
*/
// ------------------------ page 158 - default ------------------------
ThingOfDefaults defaultThing = new();
//System.Console.WriteLine(defaultThing);
// ------------------------ page 157 - constructor ------------------------
Person Sigi = new("Sigi", new DateTime(2018, 09, 07));
//System.Console.WriteLine(Sigi.ToString());
// ------------------------ page 156 - const / read-only ------------------------
//System.Console.WriteLine($"{Olli.Name} is a {Person.Species}");
// ------------------------ page 155 - static ------------------------
BankAccount.InterestRate = 0.012M;
var lenasAccount = new BankAccount();
lenasAccount.accountName = "Lenas Account";
lenasAccount.Balance = 5500;
//System.Console.WriteLine(format: "{0} earned {1:C} interest.", arg0: lenasAccount.accountName, arg1: lenasAccount.Balance * BankAccount.InterestRate);
// ------------------------ page 150 - basics ------------------------
Person Lena = new();
Lena.Name = "Lena";
Lena.favoriteWonder = WondersOfTheAncientWorld.LighthouseOfAlexandria;
Lena.DateOfBirth = new DateTime(1986, 09, 07);
Person Sigggi = new Person {
Name = "Sigi", DateOfBirth = new DateTime(2019, 12, 24), favoriteWonder = (WondersOfTheAncientWorld).3
};
Lena.Children.Add(new Person {
Name = "child1"
});
Lena.Children.Add(new Person()
{
Name = "child2"
});
/*
* Console.WriteLine(
* format: "{0} was born on {1:dddd, d MMMM yyyy} and likes {2} (int of wonder: ). ",
* arg0: Lena.name,
* arg1: Lena.dateOfBirth,
* arg2: Lena.favoriteWonder);
*
* Console.WriteLine(
* format: "{0} came to us on {1: dd MMM yy} and likes {2}",
* arg0: Sigi.name,
* arg1: Sigi.dateOfBirth,
* arg2: Sigi.favoriteWonder);
*
* foreach (var child in Lena.children) {
* System.Console.WriteLine(child.name);
* }
*/
}
}