// Event handler used to write event information to a file
// when a stock's threshold is reached
public static void WriteToFile(object sender,
StockToFileEventArgs e)
{
// Get the directory that holds the file to write to
string currentDirectory = Path.GetDirectoryName(
Path.GetDirectoryName(Directory.GetCurrentDirectory()));
// Using a lock ensures only one thread writes to the file
// at any given time
lock (thisLock) {
// Use a streamwriter to write the stock event data
// to the StockFile text file
using (StreamWriter sw = new StreamWriter(@currentDirectory
+ "StockFile.txt", true)) {
sw.WriteLine(e.DateTime.ToString().PadRight(25)
+ e.Name.PadRight(15)
+ e.CurrentValue.ToString().PadRight(10)
+ e.InitialValue.ToString().PadRight(10));
sw.Close();
}
}
}
// Method used to raise the event, called when the difference between
// the stock's current value and its intial value is equal to the
// threshold.
protected void OnThresholdReached(StockNotificationEventArgs args1,
StockToFileEventArgs args2)
{
// Using a lock ensures that no other thread tries to print to the
// console at the same time.
lock (thisLock) {
// Calls the write to console event handler
EventHandler<StockNotificationEventArgs> eventHandler = stockEvent;
if (eventHandler != null) {
eventHandler(this, args1);
}
// Calls the write to file event handler
EventHandler<StockToFileEventArgs> fileHandler = stockToFileEvent;
if (fileHandler != null) {
fileHandler(this, args2);
}
}
}
