. NET Framework event Design Guidelines

Code

  
  Namespace  Csdemos. Model
{
  Public     Delegate     Void  Pubeventhandler (  Object  Sender, pubeventargs E );

  Public    Class  Publisher
{
  Private     String  _ Name;

  Public     String  Name
{
  Get  {  Return  _ Name ;}
  Set  {_ Name =  Value ;}
}

  Public  Publisher (  String  Name ){
  This  . _ Name  =  Name;
}

  Public     Event  Pubeventhandler pubcomputer;
  Public    Event  Pubeventhandler publife;

  //  Rewrite subclass  
    Protected     Virtual     Void  Onpubcomputer (pubeventargs e ){  //  Trigger event  
   If  (Pubcomputer  ! =     Null  )
{
  //  To avoid concurrent subscriber events that take too long to process.  
  Pubeventhandler pubcomputertmp  =  Pubcomputer;
Pubcomputertmp (  This  , E );
}
}

 Protected     Virtual     Void  Onpublife (pubeventargs E)
{  //  Trigger event  
    If  (Publife  ! =     Null  )
{
  // To avoid concurrent subscriber events that take too long to process.  
  Pubeventhandler publifetmp  =  Publife;
Publifetmp (  This  , E );
}
}

  Public     Void  Dopubcomputer (  String  Magazinename, datetime dtpubdate ){
Pubeventargs E  =    New  Pubeventargs (magazinename, dtpubdate );
Onpubcomputer (E );
}


  Public     Void  Dopublife (  String  Magazinename, datetime dtpubdate)
{
Pubeventargs E  =     New  Pubeventargs (magazinename, dtpubdate );
Onpublife (E );
}

}
} 

 

 

Subscriber class:

 

 

Code

  Namespace  Csdemos. Model
{
  Class  Subscriber
{
  Private     String  _ Name;
  Public    String  Name
{
  Get  {  Return  _ Name ;}
  Set  {_ Name  =  Value ;}
}

  Public  Subscriber (  String  Name)
{
  This  . _ Name =  Name;
}

  Public     Void  Receive (  Object  Sender, pubeventargs E)
{

MessageBox. Show (  String  . Format (  "  {0} received at {1} {2}  "  ,  This . Name, E. pubdate. tostring (), E. Name ));

}
}
} 

 

Eventargs:

Namespace csdemos. Model
{
Public class pubeventargs: eventargs
{
Private string _ name;

Public string name
{
Get {return _ name ;}
Set {_ name = value ;}
}
Private datetime _ pubdate;

Public datetime pubdate
{
Get {return _ pubdate ;}
Set {_ pubdate = value ;}
}

Public pubeventargs (string name, datetime DT)
{
This. _ name = Name;
This. _ pubdate = DT;
}

}
}

Client call:

Publisher pub = new publisher ("Xinhua press ");

Subscriber subzs = new subscriber ("James ");
Subscriber Suber = new subscriber ("Li Si ");

Pub. pubcomputer + = subzs. receive;
Pub. pubcomputer + = subls. receive;

Pub. publife + = subzs. receive;

 

Pub. dopubcomputer ("computer magazine", datetime. Now );
Pub. dopublife ("Life Magazine", datetime. Now );