[review]Design Pattern:Prototype

最新推荐文章于 2025-04-07 13:20:53 发布

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最新推荐文章于 2025-04-07 13:20:53 发布

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原文链接：http://www.cnblogs.com/sanjia/archive/2011/11/28/2266837.html

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Prototype

Use the current instance of a type to create a same instance with the Clone but not new.

When we use this pattern

I have no idea now, need to dig more in the future.

Roles in this pattern

Prototype: define an interface used to clone itself
ConcretePrototype: implement the interface of the Prototype and what's more, implement the Clone method to make the self-clone.
Client:Use the ConcretePrototype to clone itself.

Demo

namespace Prototype
{
public abstract class Prototype
    {
private string id;

public string Id
        {
get { return this.id; }
        }

public Prototype(string id)
        {
this.id = id;
        }

public abstract Prototype Clone();
    }

public class ConcretePrototype : Prototype
    {
public ConcretePrototype(string id) : base(id) { }

public override Prototype Clone()
        {
return (Prototype)this.MemberwiseClone();
        }
    }

public class Client
    {
static void Main(string[] args)
        {
            ConcretePrototype c1 = new ConcretePrototype("me");
            ConcretePrototype c2 = (ConcretePrototype)c1.Clone();

            Console.WriteLine(c2.Id);//show "me" here
        }
    }
}

This is a common example to demonstrate this pattern, but in ASP.NET, you don't need to do like this, because there is an interface called as ICloneable available.

The ICloneable is equivalent to the Prototype defined above. So in ASP.NET, you can simplify the example above like below:

namespace Prototype
{

public class ConcretePrototype : ICloneable
    {
private string id;

public string Id
        {
get { return this.id; }
        }
public ConcretePrototype(string id)  
        {
this.id = id;
        }

public object Clone()
        {
return (Object)this.MemberwiseClone();
        }

    }

public class Client
    {
static void Main(string[] args)
        {
            ConcretePrototype c1 = new ConcretePrototype("me");
            ConcretePrototype c2 = (ConcretePrototype)c1.Clone();

            Console.WriteLine(c2.Id);//show "me" here
        }
    }
}