private string FormatEvent(ShellObjectChangeTypes changeType, ShellObjectNotificationEventArgs args)
{
ShellObjectChangedEventArgs changeArgs;
ShellObjectRenamedEventArgs renameArgs;
SystemImageUpdatedEventArgs imageArgs;
string msg;
if ((renameArgs = args as ShellObjectRenamedEventArgs) != null)
{
msg = string.Format("{0}: {1} ==> {2}", changeType,
renameArgs.Path,
System.IO.Path.GetFileName(renameArgs.NewPath));
}
else if ((changeArgs = args as ShellObjectChangedEventArgs) != null)
{
msg = string.Format("{0}: {1}", changeType, changeArgs.Path);
}
else if ((imageArgs = args as SystemImageUpdatedEventArgs) != null)
{
msg = string.Format("{0}: ImageUpdated ==> {1}", changeType, imageArgs.ImageIndex);
}
else
{
msg = args.ChangeType.ToString();
}
return msg;
}
public void Register(ShellObjectChangeTypes changeType, Delegate handler) {
Delegate del;
if (!_events.TryGetValue(changeType, out del)) {
_events.Add(changeType, handler);
} else {
del = MulticastDelegate.Combine(del, handler);
_events[changeType] = del;
}
}
public void Invoke(object sender, ShellObjectChangeTypes changeType, EventArgs args) {
// Removes FromInterrupt flag if pressent
changeType = changeType & ~ShellObjectChangeTypes.FromInterrupt;
Delegate del;
foreach (var change in _changeOrder.Where(x => (x & changeType) != 0)) {
if (_events.TryGetValue(change, out del)) {
del.DynamicInvoke(sender, args);
}
}
}
public void Unregister(ShellObjectChangeTypes changeType, Delegate handler) {
Delegate del;
if (_events.TryGetValue(changeType, out del)) {
del = MulticastDelegate.Remove(del, handler);
if (del == null) // It's a bug in .NET if del is non-null and has an empty invocation list.
{
_events.Remove(changeType);
} else {
_events[changeType] = del;
}
}
}
public void Unregister(ShellObjectChangeTypes changeType, Delegate handler)
{
Delegate del;
if (_events.TryGetValue(changeType, out del))
{
del = MulticastDelegate.Remove(del, handler);
if (del == null) // It's a bug in .NET if del is non-null and has an empty invocation list.
{
_events.Remove(changeType);
}
else
{
_events[changeType] = del;
}
}
}
public static extern uint SHChangeNotifyRegister(IntPtr windowHandle, ShellChangeNotifyEventSource sources, ShellObjectChangeTypes events, uint message, int entries, ref SHChangeNotifyEntry changeNotifyEntry);
internal static extern uint SHChangeNotifyRegister(
IntPtr windowHandle,
ShellChangeNotifyEventSource sources,
ShellObjectChangeTypes events,
uint message,
int entries,
ref SHChangeNotifyEntry changeNotifyEntry);