#331 – Calling a Base Class Constructor Implicitly vs. Explicitly

In a derived class, you can call a constructor in the base class explicitly using the base keyword.

    public class Terrier : Dog
    {
        public string Attitude { get; set; }

        public Terrier(string name, int age, string attitude)
            : base(name, age)
        {
            Attitude = attitude;
        }

If you don’t explicitly call a base class constructor, the default (parameterless) constructor is called implicitly.

        public Terrier(string name, int age, string attitude)
        {
            // Default Dog constructor has already been called
            //   at this point.
            Name = name;
            Age = age;
            Attitude = attitude;
        }

If you do omit the base keyword, the base class must define a default (parameterless) constructor.  If it doesn’t, the compiler will complain that the base class doesn’t have a constructor that takes 0 arguments.

Advertisements

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.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: