Hi

I use Umbraco 12.3.3 and I have a blocklist field on my document type. On the element type (used for the blocks) I have a Multinode Treepicker field. Now I would create some blocks programmatically. But no Value would be saved in the Multinode Treepicker field. All oder fields the value would be saved correctly:

    private BlockList.BlockList GetInstrumentLocationBlockList(IEnumerable<InstrumentLocationDto> instrumentLocations)
{
    BlockList.BlockList blocklistNew = new BlockList.BlockList();
    var instrumentLocationList = new List<Dictionary<string, string>>();
    var contentTypes = _contentTypeService.GetAll();
    var instrumentLocationType = contentTypes.FirstOrDefault(n => n.Alias == Constants.ElementTypes.InstrumentLocation.Alias);
    var dictionaryUdi = new List<Dictionary<string, string>>();


    foreach (var instrumentLocation in instrumentLocations)
    {
        var contentUdi = new GuidUdi("element", Guid.NewGuid());

        if (ContextAccessor.TryGetUmbracoContext(out var ctx))
        {
            List<IPublishedContent> instruments = new List<IPublishedContent>();

            foreach (var instrumentId in instrumentLocation.Instruments)
            {
                var instrumentNode = ctx.Content.GetById(instrumentId);

                if (instrumentNode != null) instruments.Add(instrumentNode);
            }



            instrumentLocationList.Add(new Dictionary<string, string>
            {
                { "contentTypeKey", instrumentLocationType.Key.ToString() },
                { "udi", contentUdi.ToString() },
                { Constants.ElementTypes.InstrumentLocation.Fields.Instruments, string.Join(",", instruments.Select(i => new GuidUdi("element", i.Key)))  },
                { Constants.ElementTypes.InstrumentLocation.Fields.Lat, instrumentLocation.Lat.ToString() },
                { Constants.ElementTypes.InstrumentLocation.Fields.Lon, instrumentLocation.Lon.ToString() },
                { Constants.ElementTypes.InstrumentLocation.Fields.School, instrumentLocation.School },
                { Constants.ElementTypes.InstrumentLocation.Fields.StreetNr, instrumentLocation.StreetNr },
                { Constants.ElementTypes.InstrumentLocation.Fields.ZipCode, instrumentLocation.ZipCode },
                { Constants.ElementTypes.InstrumentLocation.Fields.City, instrumentLocation.City },
            });


            dictionaryUdi.Add(new Dictionary<string, string> { { "contentUdi", contentUdi.ToString() } });
        }
    }

    blocklistNew.Layout = new BlockListUdi(dictionaryUdi);
    blocklistNew.ContentData = instrumentLocationList;
    blocklistNew.SettingsData = new List<Dictionary<string, string>>();


    return blocklistNew;
}

I think the problem is on this line:

{ Constants.ElementTypes.InstrumentLocation.Fields.Instruments, string.Join(",", instruments.Select(i => new GuidUdi("element", i.Key)))  },

How do I save the raw value correctly?

Thx for helping

Roland