using System;

​

IUIFactory windowsFactory = new WindowsUIFactory();

Button windowsButton = windowsFactory.CreateButton();

Checkbox windowsCheckbox = windowsFactory.CreateCheckbox();

windowsButton.Render();

windowsCheckbox.Render();

​

IUIFactory macFactory = new MacOSUIFactory();

Button macButton = macFactory.CreateButton();

Checkbox macCheckbox = macFactory.CreateCheckbox();

macButton.Render();

macCheckbox.Render();

​

​

​

public abstract class Button

{

    public abstract void Render();

}

​

public class WindowsButton : Button

{

    public override void Render()

    {

        Console.WriteLine("Rendering a Windows button.");

    }

}

​

public class MacOSButton : Button

{

    public override void Render()

    {

        Console.WriteLine("Rendering a macOS button.");

    }

}

​

public abstract class Checkbox

{

    public abstract void Render();

}

​

public class WindowsCheckbox : Checkbox

{

    public override void Render()

    {

        Console.WriteLine("Rendering a Windows checkbox.");

    }

}

​

public class MacOSCheckbox : Checkbox

{

    public override void Render()

    {

        Console.WriteLine("Rendering a macOS checkbox.");

    }

}

​

public interface IUIFactory

{

    Button CreateButton();

    Checkbox CreateCheckbox();

}

​

public class WindowsUIFactory : IUIFactory

{

    public Button CreateButton()

    {

        return new WindowsButton();

    }

​

    public Checkbox CreateCheckbox()

    {

        return new WindowsCheckbox();

    }

}

​

public class MacOSUIFactory : IUIFactory

{

    public Button CreateButton()

    {

        return new MacOSButton();

    }

​

    public Checkbox CreateCheckbox()

    {

        return new MacOSCheckbox();

    }

}

​