#824 – A Copy Constructor Makes a Copy of an Existing Object

A copy constructor is a constructor that you can define which initializes an instance of a class based on a different instance of the same class.

In the example below, we define a copy constructor for Dog.  The constructor creates a new instance of a Dog based on an existing instance.

    public class Dog
    {
        public string Name { get; set; }
        public int Age { get; set; }

        // Constructor that takes individual property values
        public Dog(string name, int age)
        {
            Name = name;
            Age = age;
        }

        // Copy constructor
        public Dog(Dog otherDog)
        {
            Name = otherDog.Name;
            Age = otherDog.Age;
        }
    }

Example of using the copy constructor:

            // Create a dog
            Dog myDog = new Dog("Kirby", 15);

            // Create a copy of Kirby
            Dog other = new Dog(myDog);

824-001

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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.

4 Responses to #824 – A Copy Constructor Makes a Copy of an Existing Object

  1. Skaarj says:

    I think in this case more correct to use interface ICloneable

  2. Pingback: #828 – Implementing Both a Copy Constructor and ICloneable | 2,000 Things You Should Know About C#

  3. Pingback: #829 – Add Comments to Indicate Shallow vs. Deep Copying | 2,000 Things You Should Know About C#

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