Event Example

1// Declare Variables
2static System.Timers.Timer refreshTimer = new System.Timers.Timer(10 * 1000); // every 10 seconds
3static AFDatabase myDB = null;
4static int myEventCounter = 0;

 1// Get the Default Database
 2PISystems myPISystems = new PISystems();
 3myDB = myPISystems.DefaultPISystem.Databases.DefaultDatabase;
 4if (myDB == null)
 5    throw new InvalidOperationException("There is no default database.");
 6
 7// Add handlers to object
 8System.Timers.ElapsedEventHandler elapsedEH = new System.Timers.ElapsedEventHandler(OnElapsed);
 9refreshTimer.Elapsed += elapsedEH;
10
11EventHandler<AFChangedEventArgs> changedEH = new EventHandler<AFChangedEventArgs>(OnChanged);
12myDB.Changed += changedEH;
13
14// Start the refresh timer which allows this application to periodically 
15// query for changes made by other applications
16refreshTimer.Start();
17
18// Make a change to a collection which generates a change event
19AFElementTemplates myElementTemplates = myDB.ElementTemplates;
20lock (myDB)
21{
22    if (myDB.ElementTemplates["myElementTemplate"] == null)
23    {
24        Console.WriteLine("Adding an element template");
25        AFElementTemplate myElementTemplate = myElementTemplates.Add("myElementTemplate");
26    }
27    else
28    {
29        Console.WriteLine("Deleting an element template");
30        myDB.ElementTemplates.Remove("myElementTemplate");
31    }
32    myDB.CheckIn();
33}
34
35// Remove handlers from object
36myDB.Changed -= changedEH;
37refreshTimer.Elapsed -= elapsedEH;

 1internal static void OnChanged(object sender, AFChangedEventArgs e)
 2{
 3    myEventCounter++;
 4    Console.WriteLine("Object Changed Event Raised");
 5}
 6
 7internal static void OnElapsed(object sender, System.Timers.ElapsedEventArgs e)
 8{
 9    // Refreshing Database will cause any external changes to be seen which will
10    // result in the triggering of the OnChanged event handler
11    lock (myDB)
12    {
13       myDB.Refresh();
14    }
15    refreshTimer.Start();
16}