private static void Main()
{
var product = new SomeProduct();
var shop1 = new Shop("Shop 1", 11.11f);
var shop2 = new Shop("Shop 2", 22.11f);
var shop3 = new Shop("Shop 3", 33.11f);
var shop4 = new Shop("Shop 4", 44.11f);
Console.WriteLine($"Before update");
Console.WriteLine(shop1);
Console.WriteLine(shop2);
Console.WriteLine(shop3);
Console.WriteLine(shop4);
product.Attach(shop1);
product.Attach(shop2);
product.Attach(shop3);
product.Attach(shop4);
product.ChangePrice(23.0f);
Console.WriteLine();
Console.WriteLine($"After update 1");
Console.WriteLine(shop1);
Console.WriteLine(shop2);
Console.WriteLine(shop3);
Console.WriteLine(shop4);
product.Detach(shop3);
product.Detach(shop4);
Console.WriteLine();
Console.WriteLine($"After update 2");
product.ChangePrice(26.0f);
Console.WriteLine(shop1);
Console.WriteLine(shop2);
Console.WriteLine(shop3);
Console.WriteLine(shop4);
}
public void Detach(Shop product)
{
this.list.Remove(product);
}
public void Attach(Shop product)
{
this.list.Add(product);
}