/// <summary>"Catches" a new dialog opened (if any) during executions of <paramref name="action"/>.</summary>
/// <param name="clientSession">The client Session.</param>
/// <param name="action">The action.</param>
/// <returns>The catch dialog. If no such dialog exists, returns null.</returns>
public static ClientLogicalForm CatchDialog(this ClientSession clientSession, Action action)
{
ClientLogicalForm dialog = null;
EventHandler <ClientDialogToShowEventArgs> clientSessionOnDialogToShow =
(sender, args) => dialog = args.DialogToShow;
bool wasSuspended = false;
// If there is an instance of UnexpectedDialogHandler registered in the client session
// make sure the UnexpectedDialogHandler is suspended while we catch a dialog
UnexpectedDialogHandler unexpectedDialogHandler = GetUnexpectedDialogHandler(clientSession);
if (unexpectedDialogHandler != null)
{
wasSuspended = unexpectedDialogHandler.IsSuspended;
unexpectedDialogHandler.IsSuspended = true;
}
clientSession.DialogToShow += clientSessionOnDialogToShow;
try
{
action();
}
finally
{
clientSession.DialogToShow -= clientSessionOnDialogToShow;
if (unexpectedDialogHandler != null)
{
unexpectedDialogHandler.IsSuspended = wasSuspended;
}
}
return(dialog);
}
private static UnexpectedDialogHandler GetUnexpectedDialogHandler(ClientSession clientSession)
{
object dialogHandlerObj;
if (clientSession.Attributes.TryGetValue(UnexpectedDialogHandler.UnexpectedDialogHandlerKey, out dialogHandlerObj))
{
UnexpectedDialogHandler unexpectedDialogHandler = dialogHandlerObj as UnexpectedDialogHandler;
if (unexpectedDialogHandler != null)
{
return(unexpectedDialogHandler);
}
}
return(null);
}