Program.StructuralCode.cs

using System;

/// <summary>
///A fully initialized instance to be copied or cloned
///
/// Specify the kind of objects to create using a prototypical instance,
/// and create new objects by copying this prototype.
/// 
/// Frequency of use: 3 Medium.
/// </summary>
namespace DoFactory.GangOfFour.Prototype.Structural
{
    /// <summary>
    /// MainApp startup class for Structural
    /// Prototype Design Pattern.
    /// </summary>
    class MainApp
    {
        /// <summary>
        /// Entry point into console application.
        /// </summary>
        static void Main()
        {
            // Create two instances and clone each

            ConcretePrototype1 p1 = new ConcretePrototype1("I");
            ConcretePrototype1 c1 = (ConcretePrototype1)p1.Clone();
            Console.WriteLine("Cloned: {0}", c1.Id);

            ConcretePrototype2 p2 = new ConcretePrototype2("II");
            ConcretePrototype2 c2 = (ConcretePrototype2)p2.Clone();
            Console.WriteLine("Cloned: {0}", c2.Id);

            // Wait for user
            Console.ReadKey();
        }
    }

    /// <summary>
    /// The 'Prototype' abstract class
    /// </summary>
    abstract class Prototype
    {
        private string _id;

        // Constructor
        public Prototype(string id)
        {
            _id = id;
        }

        // Gets id
        public string Id
        {
            get { return _id; }
        }

        public abstract Prototype Clone();
    }

    /// <summary>
    /// A 'ConcretePrototype' class 
    /// </summary>
    class ConcretePrototype1 : Prototype
    {
        // Constructor
        public ConcretePrototype1(string id)
          : base(id)
        {
        }

        // Returns a shallow copy
        public override Prototype Clone()
        {
            return (Prototype)MemberwiseClone();
        }
    }

    /// <summary>
    /// A 'ConcretePrototype' class 
    /// </summary>
    class ConcretePrototype2 : Prototype
    {
        // Constructor
        public ConcretePrototype2(string id)
          : base(id)
        {
        }

        // Returns a shallow copy
        public override Prototype Clone()
        {
            return (Prototype)MemberwiseClone();
        }
    }
}


//Output:

//Cloned: I
//Cloned: II