Best way to switch behavior based on type [duplicate]

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There’s another possibility. Use virtual dispatch:

class Widget
{
    public virtual void GuiStuff() { }
} 
class RedWidget : Widget
{
    public override void GuiStuff()
    {
        //... red-specific GUI stuff
        base.GuiStuff();
    }
} 
class BlueWidget : Widget
{
    public override void GuiStuff()
    {
        //... blue-specific GUI stuff
        base.GuiStuff();
    }
}

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