public IReadOnlyDictionary<string,ContingentValue> GetContingentValues()

{
  // Must be called within QueuedTask.Run
  void GetPossibleContingentValues(FeatureClass parcels, string zoningFieldName = "Zone")
  {
    using (RowBuffer rowBuffer = parcels.CreateRowBuffer())
    {
      IReadOnlyDictionary<FieldGroup, IReadOnlyList<ContingentValue>> possibleZonings = parcels.GetContingentValues(rowBuffer, zoningFieldName);
      IEnumerable<FieldGroup> possibleFieldGroups = possibleZonings.Keys;

      foreach (FieldGroup possibleFieldGroup in possibleFieldGroups)
      {
        IReadOnlyList<ContingentValue> possibleZoningValues = possibleZonings[possibleFieldGroup];
        foreach (ContingentValue possibleZoningValue in possibleZoningValues)
        {
          switch (possibleZoningValue)
          {
            case ContingentCodedValue codedValue:
              string codedValueDomainName = codedValue.Name;
              object codedValueDomainValue = codedValue.CodedValue;
              break;
            case ContingentRangeValue rangeValue:
              object rangeDomainMaxValue = rangeValue.Max;
              object rangeDomainMinValue = rangeValue.Min;
              break;
            case ContingentAnyValue contingentAnyValue:
              // Any value type
              break;
            case ContingentNullValue contingentNullValue:
              // Null value
              break;
          }
        }
      }
    }
  }
}