Core Design Patterns(8) Prototype 原型模式

VS 2008

当我们需要实例化一个类的多个实例，并且实例化的代价比较昂贵的时候，可以使用原型模式。

1. 模式UML图



2. 应用



IPrototype.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignPattern.Prototype.BLL {

    public interface IPrototype<T> {

        T Clone();
        T DeepCopy();
    }
}

UserInfo.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml.Serialization;

namespace DesignPattern.Prototype.BLL {

    [Serializable]
    public class UserInfo : IPrototype<UserInfo> {

        public int UserId {
            get;
            set;
        }
        public string UserName {
            get;
            set;
        }
        public PetInfo Pet {
            get;
            set;
        }

        IPrototype Members#region IPrototype<UserInfo> Members

        public UserInfo Clone() {
            return this.MemberwiseClone() as UserInfo;
        }

        public UserInfo DeepCopy() {
            using (MemoryStream ms = new MemoryStream()) {
                XmlSerializer xz = new XmlSerializer(this.GetType());
                xz.Serialize(ms, this);
                ms.Seek(0, SeekOrigin.Begin);
                return xz.Deserialize(ms) as UserInfo;
            }
        }

        #endregion
    }
}

PetInfo.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;

namespace DesignPattern.Prototype.BLL {

    [Serializable]
    public class PetInfo {

        public string PetName {
            get;
            set;
        }
    }
}

Client

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DesignPattern.Prototype.BLL;

namespace DesignPattern.Prototype {
    class Program {
        static void Main(string[] args) {
            UserInfo u = new UserInfo() {
                UserId = 1,
                UserName = "guozhijian",
                Pet = new PetInfo() {
                    PetName = "nana"
                }
            };
            UserInfo uCopy = u.Clone();

            Console.WriteLine("{0},{1},{2}", uCopy.UserId.ToString(), uCopy.UserName, uCopy.Pet.PetName);

            UserInfo uDeepCopy = u.DeepCopy();
            uDeepCopy.Pet.PetName = "sasa";
            Console.WriteLine("{0},{1},{2}", uDeepCopy.UserId.ToString(), uDeepCopy.UserName, uDeepCopy.Pet.PetName);

            Console.WriteLine(u.Pet.PetName);


        }
    }
}

Output