#313 – Accessibility of Constructors in a Class

You can apply access modifiers to instance constructors, dictating what code is allowed to create an instance of the class using a signature that matches the constructor.

• public – All code has access
• private – Only code in defining class has access
• protected – Code in defining class or derived classes has access
• internal – All code in defining assembly has access
• protected internal – Code in defining assembly or in derived classes has access

        // All code
        public Dog(string name, int age)
        {
            Name = name;
            Age = age;
        }

        // Only code in this class has access
        private Dog()
        {
            Name = "UNKNOWN";
            Age = 0;
        }

        // Code in this class or subclass has access
        protected Dog(string name)
        {
            Name = name;
            Age = 1;
        }

        // Code in same assembly has access
        internal Dog(int age)
        {
            Name = "INTERNAL";
            Age = age;
        }

        // Code in same assembly or derived classes has access
        protected internal Dog(double age)
        {
            Age = (int)age;
        }