lgolubyev

using system;
using System.Runtime.CompilerServices;
class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine($"Data={Data}");
    }
    public static string Data;
    [ModuleInitializer]

lgolubyev

using system;
using System.Collections.Generic;
    IEnumerator<string> colors = new List<string> {"blue", "red", "green"}.GetEnumerator();
foreach (var colors in colors)
{
    Console.WriteLine($"{color} is my favorite color");
}
public static class Extensions
{
    public static IEnumerator<T> GetEnumerator<T>(this IEnumerator<T> enumerator) => enumerator;

lgolubyev

abstract class Weather
{
    public abstract Temperature GetTemperature();
}
class Spain : Weather
{
    public override Celsius GetTemperature() => new Celsius();
}
class USA : Weather
{

lgolubyev

Point point1 = new() { X = 1, Y = 2};
Console.WriteLine(point1.ToString());
public record Point
{
    public int X { get; init;}
    public int Y { get; init;}
}

lgolubyev

Point point1 = new() { X = 1, Y = 2};
Point point2 = point1 with { Y = 4};
Console.WriteLine(point1.ToString());
public record Point
{
    public int X { get; init;}
    public int Y { get; init;}
}

lgolubyev

Point point1 = new(1, 2);
Console.WriteLine(point1.ToString());
Point point2 = new(1, 2)};
Console.WriteLine(point1.Equals(point2));
public record Point
{
    public int X { get;}
    public int Y { get;}
    public Point(int x, int y) => (X, Y) = (x, y);
}

lgolubyev

//C#8
button.Click += (s, e) => {Message.Box.Show("Button clicked"); };
//C#9
button.Click += (_, _) => {Message.Box.Show("Button clicked"); };

lgolubyev

Point point = new() {X = 1, Y = 2};
Console.WriteLine($"point:({point1.X}, {point.Y})");
public class Point
{
    public int X { get; set; }
    public int Y { get; set; }
}

lgolubyev

Point point = new(1, 2);
Console.WriteLine($"point:({point1.X}, {point.Y})");
public class Point{
    public int X { get; }
    public int Y { get; }
    public Point(int x, int y) => (X, Y) = (x, y);
}

lgolubyev

using System;
Console.WriteLine("Hello World!");