LINQ's OfType and Inheritance

Just in case you were wondering, the generic type argument passed into the LINQ method "OfType<T>" filters the list to only objects that are, or inherit from a specific type, that is, it will also return instances of objects that inherit from the specified type. The following code gives an example:

public class Thing 
{
    public override string ToString()
    {
        return "I'm a CompanyBase";
    }
}

public class Widget : Thing
{
    public override string ToString()
    {
        return "I'm a WidgetBase";
    }
}

public class FooWidget : Widget
{
    public override string ToString()
    {
        return "I'm a FooWidget";
    }
}

public class BarWidget : Widget
{
    public override string ToString()
    {
        return "I'm a BarWidget";
    }
}


public class Gadget : Thing
{
    public override string ToString()
    {
        return "I'm a Gadget!";
    }
}

class Program
{
    static void Main(string[] args)
    {
        List<Thing> items = new List<Thing>();
        items.Add(new Gadget());
        items.Add(new Thing());
        items.Add(new Widget());
        items.Add(new FooWidget());
        items.Add(new BarWidget());

        var widgets = items.OfType<Widget>();

        foreach (var item in widgets)
            Console.WriteLine(item);
        Console.ReadLine();
    }
}