#588 – A Default Parameter Value Can Be Null

When defining optional parameters and providing a default value for the parameter, you can use a value of null for a reference-typed parameter.  null is actually the only valid default value that you can use for a reference-typed parameter.

        static void LogDogInfo(Dog myDog, Dog anotherDog = null)
        {
            Console.WriteLine("My dog is {0}", myDog.Name);
            if (anotherDog != null)
                Console.WriteLine("  And there is also {0}", anotherDog.Name);
        }

        static void Main()
        {
            Dog dog1 = new Dog("Kirby", 15);
            Dog dog2 = new Dog("Jack", 17);

            LogDogInfo(dog1);
            LogDogInfo(dog2, dog1);
        }

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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