Complete set: Intro to C - Bill Buchanan

stance.
• In the subscribing class we create a method that matches the delegate.
• In the subscribing class we subscribe to the event.
10.7 Megalomania2
10.7.1 How to subscribe
We require the detail section to be updated automatically whenever a change is
made to the country that is currently on display.
We have a method ShowDetailsOfCountry that updates this display:
private void ShowDetailsOfCountry(Object oCountry, EventArgs e)
{
Country c = oCountry as Country;
if (c!=null)
{
detailName.Text =c.Name;
detailRegion.Text =c.Region;
detailPopulation.Text = c.Population.ToString();
}
}
This takes in country and updates the three text boxes to reflect that country.
We call this routine whenever the user clicks on the list box.
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We want this routine to be called whenever the currently selected country is
changed. We want to be sure that it is not possible for the country to be changed
without this routine being fired.
Every time the user click on the list box we subscribe to the selected country’s On‐
Change event. This ensures that if the country gets changed the display will be
updated. Before we subscribe however we must un‐subscribe the previously selected
country.
Agilent .NET Course: Module 10,page 9