ArcGIS Pro获得一个字段值

ublic async Taskstring>> LookupMukey()
        {
            var mukeys = new List<string>();
            var MV = MapView.Active;
            int mukeyCount = 0;
            var SelectionLayer = MV.Map.GetLayersAsFlattenedList().OfType().Where(fl => fl.Name.Contains("SelectionLayer")).FirstOrDefault();

            await QueuedTask.Run(() =>
            {
                using (var SelectionTable = SelectionLayer.GetTable())
                {
                    using (var rowCursor = SelectionTable.Search())
                    {
                        while (rowCursor.MoveNext())
                        {
                            using (Row row = rowCursor.Current)
                            {
                                var mukey = Convert.ToString(row["mukey"]);
                                mukeys.Add(mukey);
                                mukeyCount++;
                            }
                        }
                    }
                }
            });
            return mukeys;
        }

var mukeys = await LookupMukey();