#590 – Optional Parameters in Constructors

You’ll typically see optional parameters in methods.  But you can also define an optional parameter in a constructor:

        public string Name { get; set; }
        public int Age { get; set; }
        public string FavoriteToy { get; set; }
        public Dog Father { get; set; }
        public Dog Mother { get; set; }

        public Dog(string name, int age = 1, string favToy = "Bone",
            Dog father = null, Dog mother = null)
        {
            Name = name;
            Age = age;
            FavoriteToy = favToy;
            Father = father;
            Mother = mother;
        }

 

            Dog kirby = new Dog("Kirby", 15, "Ball");
            Dog sonOfKirby = new Dog("Ferbie", 2, "Frisbee", kirby);


Optional parameters in constructors avoid the need to chain constructors.

 

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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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