การใช้ร่วมกับคุณสมบัติและชนิดฐาน

using System;

class Animal(string name) {
    public string Name => name;
}

class Dog(string name) : Animal(name) {
    public string Speak() => Name + " says Woof";
}

Console.WriteLine(new Dog("Rex").Speak()); // Rex says Woof

using System;

class Shape(string color) {
    public string Color => color;
}

class Box(string color, int size) : Shape(color) {
    public int Size => size;
}

var b = new Box("red", 5);
Console.WriteLine(b.Color + " " + b.Size); // red 5

using System;

class Label(string text) {
    public string Text => text;
}

class UpperLabel(string text) : Label(text.ToUpper()) {
}

Console.WriteLine(new UpperLabel("hi").Text); // HI

using System;

class Product(string name, decimal price) {
    public string Name { get; } = name;
    public decimal Price { get; set; } = price;
}

var p = new Product("Book", 12m);
p.Price = 10m;
Console.WriteLine(p.Name + " " + p.Price); // Book 10

using System;

class Base(int id) {
    public int Id => id;
}

class Item(int id, string label) : Base(id) {
    public string Describe() => "#" + id + ": " + label;
}

Console.WriteLine(new Item(7, "Widget").Describe()); // #7: Widget

using System;

record Person(string First, string Last) {
    public string Full => First + " " + Last;
}

Console.WriteLine(new Person("Ada", "Lovelace").Full); // Ada Lovelace

using System;

record Vehicle(string Make);
record Car(string Make, int Doors) : Vehicle(Make);

var c = new Car("Toyota", 4);
Console.WriteLine(c.Make + " " + c.Doors); // Toyota 4

using System;

class Base(string tag) { public string Tag => tag; }

class Node(string tag) : Base(tag) {
    public string Tag2 { get; } =
        tag.Length > 0 ? tag : throw new ArgumentException("empty");
}

Console.WriteLine(new Node("a").Tag); // a

using System;

class Order(int id, decimal total) {
    public decimal Total { get; } = total; // public
    public string Reference() => "ORD-" + id;   // id stays private
}

var o = new Order(42, 99m);
Console.WriteLine(o.Reference() + " " + o.Total); // ORD-42 99

using System;

class Session(string user) {
    public string User { get; } = user;
    public bool Active { get; set; } = true;
}

var s = new Session("kai");
Console.WriteLine(s.User + " " + s.Active); // kai True

using System;

class Employee(string name) {
    public string Name => name;
}

class Manager(string name, int teamSize) : Employee(name) {
    public int TeamSize { get; } = teamSize;
    public string Title => Name + " (manages " + TeamSize + ")";
}

Console.WriteLine(new Manager("Sam", 5).Title); // Sam (manages 5)