结构

原型模式

说明

Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype.

用原型实例指定创建对象的种类,并且通过拷贝这些原型创建新的对象。

适用条件

原型模式多用于创建复杂的或者耗时的实例,因为这种情况下,复制一个已经存在的实例使程序运行更高效;或者创建值相等,只是命名不一样的同类数据。

实现

abstract class Prototype : ICloneable {

   public abstract int X {
      get;
      set;
   }

   public abstract void PrintX();

   public abstract object Clone();

}

class PrototypeImpl : Prototype {

   private int _x;

   public override int X {
      get {
         return this._x;
      }
      set {
         this._x = value;
      }
   }

   public PrototypeImpl(int x) {
      this._x = x;
   }

   public override void PrintX() {
      Console.WriteLine("value : {0}", this.X);
   }

   public override object Clone() {
      return new PrototypeImpl(this._x);
   }
}

class Program {

   static void Main(string[] args) {
      Prototype prototype = new PrototypeImpl(1000);

      for (int i = 1; i < 10; i++) {
         var tempotype = (Prototype)prototype.Clone();

         // Usage of values in prototype to derive a new value.
         tempotype.X = tempotype.X * i;
         tempotype.PrintX();
      }

      Console.ReadKey();
   }
}