{

           
   
   return 
   
   "
   
   my sql connection
   
   ";

       }

   }

 

   
   
   public 
   
   class MSsqlHelp : sqlHelp

   {

 

       
   
   override 
   
   string sqlConnection()

       {

           
   
   ms sql connection
   
   ";

       }

   }

   
   
   class OraclesqlHelp : sqlHelp

   {

 

       
   
   oracle sql connection
   
   ";

       }

   }
  
  

  
  

   
   <?
   
   xml version="1.0" encoding="utf-8" 
   
   ?>


   
   <
   
   configuration
   
   >

  
   
   configSections
   
   section 
   
   name
   
   ="unity"
   
    type
   
   ="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration"
   
   />

  
   
   </
   
   unity 
   
   xmlns
   
   ="http://schemas.microsoft.com/practices/2010/unity"
   
   >

    
   
   container
   
   >

      
   
   register 
   
   type
   
   ="sqlHelp,New_Code"
   
    mapTo
   
   ="MysqLHelp,New_Code"
   
   >

        
   
   lifetime 
   
   ="singleton"
   
   />

      
   
   register
   
   >

       

    
   
   unity
   
   >


   
   >
  
  

  
  
void Main()

{

    IUnityContainer container = 
   
   new UnityContainer();

    UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection(
   
   unity
   
   ");

    section.Containers.Default.Configure(container);

 

    sqlHelp sqlHelp = container.Resolve<sqlHelp>();

    Console.WriteLine(sqlHelp.sqlConnection());

}
  
  

运行结果:

my sql connection