public static void Behavioral_ObserverDemo2()
{
var statusBar = new StatusBar();
var stockListView = new StockListView();
var stock1 = new Stock("stock1", 10);
var stock2 = new Stock("stock2", 20);
var stock3 = new Stock("stock3", 30);
// The status bar shows the popular stocks
statusBar.AddStock(stock1);
statusBar.AddStock(stock2);
// The stock view list shows all stocks
stockListView.AddStock(stock1);
stockListView.AddStock(stock2);
stockListView.AddStock(stock3);
// Causes both statusBar and stockListView to get refreshed
stock2.SetPrice(21);
// Causes only the stockListView to get refreshed. (statusBar
// is not watching this stock.)
stock3.SetPrice(9);
}
public ObserverPatternMain()
{
// Stocks
Stock stock1 = new Stock("EMR", 1);
Stock stock2 = new Stock("SHS", 3);
Stock stock3 = new Stock("JSK", 7);
// Presentation Layers
var statusBar = new StatusBar();
var stockListView = new StockListView();
statusBar.AddStock(stock1);
stockListView.AddStock(stock1);
stockListView.AddStock(stock2);
stockListView.AddStock(stock3);
// stock1.Price = 10;
stock2.Price = 12;
}
static void Main(string[] args)
{
// Pull Style Observer Pattern
var pullStyleDataSource = new Solution.PullStyle.DataSource();
var pullStyleChart = new Solution.PullStyle.Chart(pullStyleDataSource);
pullStyleDataSource.Attach(pullStyleChart);
var pullStyleSpreadSheet = new Solution.PullStyle.SpreadSheet(pullStyleDataSource);
pullStyleDataSource.Attach(pullStyleSpreadSheet);
pullStyleDataSource.SetValue(10);
pullStyleDataSource.Dettach(pullStyleSpreadSheet);
pullStyleDataSource.SetValue(50);
// Push Style Observer Pattern
var pushStyleDataSource = new Solution.PushStyle.DataSource();
var pushStyleChart = new Solution.PushStyle.Chart();
pushStyleDataSource.Attach(pushStyleChart);
var pushStyleSpreadSheet = new Solution.PushStyle.SpreadSheet();
pushStyleDataSource.Attach(pushStyleSpreadSheet);
pushStyleDataSource.SetValue(10);
pushStyleDataSource.Dettach(pushStyleSpreadSheet);
pushStyleDataSource.SetValue(50);
Console.WriteLine("--- Exercise ---");
var listOfStocks = new List <Stock>
{
new Stock("Stock1", 10),
new Stock("Stock2", 20),
new Stock("Stock3", 30),
};
var statusBar = new StatusBar();
statusBar.AddStock(listOfStocks[0]);
statusBar.AddStock(listOfStocks[1]);
var stockListView = new StockListView();
stockListView.AddStock(listOfStocks[0]);
stockListView.AddStock(listOfStocks[1]);
stockListView.AddStock(listOfStocks[2]);
listOfStocks[0].SetPrice(15);
listOfStocks[1].SetPrice(25);
listOfStocks[2].SetPrice(35);
listOfStocks[1].Dettach(statusBar);
listOfStocks[0].SetPrice(25);
listOfStocks[1].SetPrice(35);
listOfStocks[2].SetPrice(45);
Console.ReadLine();
}