Static Methods Can Call Instance Methods

Static methods can call instance methods in a class–provided that they have access to a reference to an instance of the class.
In the example below, we have a static method of the Dog class that dumps out a bunch of information about every Doginstance in a collection of dogs passed to it.
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public static void ListDogs(List<Dog> dogList, Cat cat)
{
    foreach (Dog d in dogList)
    {
        string likes = d.LikesCat(cat) ? "Yes" : "No";
 
        Console.WriteLine("{0}: {1} yrs old.  Motto is [{2}]. Likes {3}? {4}",
            d.Name,
            d.Age,
            d.Motto,
            cat.Name,
            likes);
    }
}
Note that the static Dog method can also call an instance method of the Cat class.
Here’s how we might call this method:
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List<Dog> dogs = new List<Dog>();
 
dogs.Add(new Dog("Kirby", 14, "Chase balls"));
dogs.Add(new Dog("Jack", 17, "Lounge around house"));
dogs.Add(new Dog("Ruby", 1, "Stare out window"));
 
Cat morris = new Cat("Morris");
 
Dog.ListDogs(dogs, morris);
Output:
Be a Fan
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