#715 – Private Members Are Not Visible in a Derived Class

Class members declared with an accessibility level of private are accessible only within the code for the class in which they are declared.  They are not accessible from a derived class.

In the example below, dogData is a private member of the Dog class, so it is not visible within the Terrier class (which inherits from Dog).

    public class Dog
    {
        // Stuff that's clearly public
        public string Name { get; set; }
        public int Age { get; set; }

        private int dogData;

        public Dog(string name, int age)
        {
            Name = name;
            Age = age;
            dogData = 12;
        }
    }
    public class Terrier : Dog
    {
        public Terrier(string name, int age) : base(name, age)
        {
        }

        public void Snarl()
        {
            // Compiler error: dogData is inaccessible due to its protection level
            Console.WriteLine(dogData);
        }
    }
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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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