Complete set: Intro to C - Bill Buchanan

10.7.2 How to publish
The class Country is the publisher.
public delegate void changeHandler
(object country, System.EventArgs e);
public event changeHandler OnChange;
public int Population
{
get{return this.population;}
set
{
this.population=value;
if (OnChange!=null)
OnChange(this,null);
}
}
10.8 Benefits of using events
We have created an application in which the user interface is able to respond to
changes in the data.
Crucially the Country class has no connection with the user interface – even though
the trigger action takes place inside the Country class we do not have to recompile
the Country class to take account of changes to the user interface.
duction to .NET
Intro
Our interface will respond to changes even if third parties. Some other user who has
no interest in our interface may make changes. We are monitoring the objects “invisibly”.
Agilent .NET Course: Module 10,page
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