c# - How Can I Unfold This Event into an Observable Sequence? -

well, when think i've got handle on things, thrown curve.

i'm trying create observable sequence instead of doing this:

((outlook.mapifolderevents_12_event)calendarfolder).beforeitemmove +=     calendar_beforeitemmove;  private void calendar_beforeitemmove(     object item,      outlook.mapifolder destfolder,      ref bool cancel){ /*...*/ } 

i'm trying use observable.fromeventpattern<tdelegate, teventargs> (func<eventhandler<teventargs>, tdelegate>, action<tdelegate>, action<tdelegate>) method, because of required parameters i'm meeting little success. closest have been able come is:

var itembeforemovedobservable = observable     .fromevent<outlook.mapifolderevents_12_beforeitemmoveeventhandler, object>(handler =>     {        outlook.mapifolderevents_12_beforeitemmoveeventhandler bimeventhandler =        (obj, f, ref cx) =>  // <-- cannot resolve symbol 'cx'; identifier expected        {           handler(obj); // <-- shouldn't have other parameters well?        };        return bimeventhandler;     },     h => ((outlook.mapifolderevents_12_event)calendarfolder).beforeitemmove += h,     h => ((outlook.mapifolderevents_12_event)calendarfolder).beforeitemmove -= h); 

thanks in advance guidance.

i don't have access way test would best off wrapping operator:

//because naming ridiculous using itemmoveeventhandler = outlook.mapifolderevents_12_beforeitemmoveeventhandler;  using itemmoveevent = outlook.mapifolderevents_12_event;  //used wrap multiple arguments single object public class mymoveeventargs {   public mymoveeventargs(object item, mapifolder folder) {     this.item = item;     this.folder = folder;   }    public object item {get; private set;}   public mapifolder folder {get; private set;} }  //create extension method public static iobservable<mymoveeventargs> beforemoveobservable(   itemmoveevent folder,    func<object, mapifolder, bool> shouldcancel) {      return observable.fromevent<itemmoveeventhandler,                                moveeventargs>                     //use conversion overload                     (emit => new itemmoveeventhandler(                           //the compiler seems complain cancel                           //being implicit, explicitly declare params                           (object item, mapifolder f, out bool cancel) =>                            {                             //cancel needs set somewhere in body                             if (!(cancel = shouldcancel(item, f)) {                              emit(new mymoveeventargs(item, f));                             }                           }                     },                     h => folder.beforeitemmove += h,                     h => folder.beforeitemmove -= h);  } 

then should able use (untested):

calendarfolder.beforemoveobservable((obj, folder => /*return if event should cancelled or not*/) .subscribe(x => /*only reach here if move successful*/);