C# 3.0 Design Patterns

Prototype Pattern Example Code—Photo Archive

See the following code for an example of the Prototype Pattern:

Here is an using System; using System.Collections.Generic; using System.IO; using PrototypePattern; namespace CompositePattern { // The Composite Pattern namespace // including the Share operations // The Interface public interface IComponent <T> { void Add(IComponent <T> c); IComponent <T> Remove(T s); string Display(int depth); IComponent <T> Find(T s); IComponent <T> Share (T s,IComponent <T> home); string Name {get; set;} } // The Composite [Serializable( )] public class Composite <T> : IPrototype <IComponent <T>>, IComponent <T> { List <IComponent <T>> list; public string Name {get; set;} public Composite (string name) { Name = name; list = new List <IComponent <T>> ( ); } public void Add(IComponent <T> c) { list.Add(c); } // Finds the item from a particular point in the structure // and returns the composite from which it was removed // If not found, return the point as given public IComponent <T> Remove(T s) { holder = this; IComponent <T> p = holder.Find(s); if (holder!=null) { (holder as Composite<T>).list.Remove(p); return holder; } else return this; } IComponent <T> holder=null; // Recursively looks for an item // Returns its reference or else null public IComponent <T> Find (T s) { holder = this; if (Name.Equals(s)) return this; IComponent <T> found=null; foreach (IComponent <T> c in list) { found = c.Find(s); if (found!=null) break; } return found; } public ...