简单的单件模式泛型类

 

using  System;
using  System.Collections.Generic;

public   class  MyClass
{
     public   static   void  Main()
    {
        A a  =  Singleton < A > .GetInstance();
        B b  =  Singleton < B > .GetInstance();
        B b1  =  Singleton < B > .GetInstance();;
         if  (a.Equals(b))
            Console.WriteLine( " a Equals b: true " );
         else
            Console.WriteLine( " a Equals b: false " );
         if  (b.Equals(b1))
            Console.WriteLine( " b Equals b1: true " );
         else
            Console.WriteLine( " b Equals b1: false " );
        RL();
    }
    
     #region  Helper methods

     private   static   void  WL( object  text,  params   object [] args)
    {
        Console.WriteLine(text.ToString(), args);    
    }
    
     private   static   void  RL()
    {
        Console.ReadLine();    
    }
    
     private   static   void  Break() 
    {
        System.Diagnostics.Debugger.Break();
    }

     #endregion
}


public   class  A
{
     public  A()
    {}
}

public   class  B
{
     public  B()
    {}
}

///   <summary>
///  Singleton泛型类
///   </summary>
public   sealed   class  Singleton < T >   where  T :  new ()
{
     private   static   readonly  T instance  =   new  T();

     private  Singleton() { }
       
     public   static  T GetInstance()
    {
         return  instance;
    }
}