dev/CSHARP/Lessons.md

=== Классы и объекты ===

Person tom = new Person(); string personName = tom.name; int personAge = tom.age; Console.WriteLine($"name: {personName} age: {personAge}");

tom.name = "Tom"; tom.age = 37; tom.Print();

class Person { public string name = "Undefined"; public int age;

public void Print()
{
    Console.WriteLine($"Имя: {name} Возраст: {age}");
}

}

=== Конструкторы, инициализаторы и деконструкторы ===

Person tom = new Person(); Person bob = new Person("Bob"); Person sam = new Person("Sam", 25); tom.Print(); bob.Print(); sam.Print();

class Person { public string name; public int age; public Person() { name = "Unknown"; age = 18; } public Person(string n) { name = n; age = 18; } public Person(string n, int a) { name = n; age = a; }

public void Print()
{
    Console.WriteLine($"name: {name} age: {age}");
}

}

Person sam = new Person("Sam", 25); sam.Print();

class Person { public string name; public int age; public Person() { name = "Unknown"; age = 18; } public Person(string name) { this.name = name; age = 18; } public Person(string name, int age) { this.name = name; this.age = age; } public void Print() { Console.WriteLine($"name: {name} age: {age}"); } }

"Цепочка вызова конструкторов" Person sam = new Person("Sam", 25); sam.Print();

class Person { public string name; public int age; public Person() : this("Unknown") { } public Person(string name) : this(name, 18) { } public Person(string name, int age) { this.name = name; this.age = age; } public void Print() => Console.WriteLine($"Name: {name} Age: {age}"); }

"Первичные конструкторы" var tom = new Person("Tom", 38); Console.WriteLine(tom);

public class Person(string name, int age) { public Person(string name) : this(name, 18) { } public void Print() => Console.WriteLine($"name: {name}, age: {age}"); } "Инициализаторы объектов" Person tom = new Person { name = "Tom", company = { title = "Microsoft" } }; tom.Print();

class Person { public string name; public Company company; public Person() { name = "Undefinde"; company = new Company(); } public void Print() => Console.WriteLine($"name: {name} company: {company.title}"); }

class Company { public string title = "Unknown"; }

"Деконструкторы" Person person = new Person("Tom", 33); (string name, int age) = person; //(_, int age) = person если нужен только возраст Console.WriteLine(name);

class Person { string name; int age; public Person(string name, int age) { this.name; this.age; } public void Deconstruct(out string personName, out int personAge) { personName = name; personAge = age; } }

"Класс Program и метод Main. Программы верхнего уровня" string hello = "Hello"; Print(hello);

void Print(string message) { Console.WriteLine(message); }

Person tom = new(); tom.SayHello();

class Person { public void SayHello() => Console.WriteLine("Hello"); }