单件模式笔记

          单件模式要求一个类有且仅有一个实例,同时提供了一个全局访问点.

          单线程Singleton模式实现
public class Singleton
{
  private static Singleton singleton;
  private Singleton(){       }
  public static Singleton Singleton
{  get 
        {   if(singleton==null)  {singleton=new Singleton();}             return singleton;
}
}

多线程Singleton模式的实现
Œ
public class Singleton
{
     public static readonly Singleton Singleton=new Singleton();
     private Singleton(){}
}


public class Singleton
{
    public static readonly Singleton Singleton;
    static Singleton{Singlenton=new Singlenton();}
    private Singleton(){}
}