- _dbChangedDelegate = (string uri, IntPtr userData) =>
- {
- _callbackMap[uri](uri);
- };
- int error = Interop.Database.AddChangedCallback(viewUri, _dbChangedDelegate, IntPtr.Zero);
- if (CalendarError.None != (CalendarError)error)
- {
- Log.Error(Globals.LogTag, "AddDBChangedDelegate Failed with error " + error);
- throw CalendarErrorFactory.GetException(error);
- }
- _callbackMap[viewUri] += callback;
- _delegateMap[viewUri] = _dbChangedDelegate;
+ if (!_callbackMap.ContainsKey(viewUri))
+ {
+ _callbackMap[viewUri] = (string uri, IntPtr userData) =>
+ {
+ DBChangedEventArgs args = new DBChangedEventArgs(uri);
+ _eventHandlerMap[uri]?.Invoke(this, args);
+ };
+
+ int error = Interop.Database.AddChangedCallback(viewUri, _callbackMap[viewUri], IntPtr.Zero);
+ if (CalendarError.None != (CalendarError)error)
+ {
+ Log.Error(Globals.LogTag, "AddDBChangedDelegate Failed with error " + error);
+ throw CalendarErrorFactory.GetException(error);
+ }
+ }
+
+ EventHandler<DBChangedEventArgs> handler = null;
+ if (!_eventHandlerMap.TryGetValue(viewUri, out handler))
+ _eventHandlerMap.Add(viewUri, null);
+
+ _eventHandlerMap[viewUri] = handler + DBChanged;