浅析软件项目开发中的单件模式(1)

using System;
namespace VisionLogic.DesignPattern.Practice
...{
public class Singleton
...{
private static Singleton instance;
private Singleton() ...{ }
public static Singleton Instance
...{
get
...{
if (instance == null)
...{
instance = new Singleton();
instance.data = 0;
}
return instance;
}
}
/**//// <summary>
/// 共享的实例数据
/// </summary>
private int data;
public int Data
...{
get ...{ return data; }
set ...{ data = value; }
}
}
}

using System;
using System.Diagnostics;
using VisionLogic.DesignPattern.Practice;
namespace VisionLogic.DesignPattern.Practice.Client
...{
class Program
...{
static void Main(string[] args)
...{
Singleton instance1 = Singleton.Instance;
Singleton instance2 = Singleton.Instance;
instance1.Data = 30;
Trace.WriteLine(instance2.Data);
instance2.Data = 15;
Trace.WriteLine(instance1.Data);
}
}
}
结果：
30
15

using System;
namespace VisionLogic.DesignPattern.Practice
...{
public class BaseEntity : ICloneable
...{
public object Clone()
...{
return this.MemberwiseClone();
}
}

public class Singleton : BaseEntity
...{
private static Singleton instance;
private Singleton() ...{ }
public static Singleton Instance
...{
get
...{
if (instance == null)
...{
instance = new Singleton();
instance.data = 0;
}
return instance;
}
}
….   
}
}