#823 – A Nested Factory Class Implemented as a Singleton

Below is an instance of the factory pattern, with the factory class nested within the class that it creates instances for, implemented as a singleton.

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

        private Dog(string name)
        {
            Name = name;
        }

        public class Factory
        {
            // Instance created when first referenced
            private static readonly Factory instance = new Factory();

            // Prevent early instantiation due to beforefieldinit flag
            static Factory() { }

            // Prevent instantiation
            private Factory() { }

            public static Factory Instance
            {
                get { return instance; }
            }

            // Factory method
            public Dog CreateDog(string name)
            {
                return new Dog(name);
            }
        }
    }
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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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