public static void Run()
{
var dataSource = new DataSourcePull();
IObserverPull spreadsheet = new SpreadsheetPull(dataSource);
IObserverPull piechart = new PieChartPull(dataSource);
dataSource.AddObserver(spreadsheet);
dataSource.AddObserver(piechart);
dataSource.Display();
dataSource.Data = 12;
dataSource.RemoveObserver(piechart);
dataSource.Data = 13;
}
internal SpreadsheetPull(DataSourcePull dataSource)
{
this.dataSource = dataSource;
}
internal PieChartPull(DataSourcePull dataSource)
{
this.dataSource = dataSource;
}