public override async Task <IScriptCommand> ExecuteAsync(ParameterDic pm)
{
IEntryModel[] entryModels = DirectoryEntryKey == null ? new IEntryModel[] { } :
(await pm.GetValueAsEntryModelArrayAsync(DirectoryEntryKey));
object evnt = new RootChangedEvent(ChangeType, entryModels);;
return(CoreScriptCommands.BroadcastEvent(EventsKey, evnt, NextCommand));
}