Getting a group sort type (CrSortDirectionEnum)

I needed to get the sort directon for a GROUP sort. However, using the following code is invalid for groups (at least if the group is not asc/desc):
CrystalDecisions.CrystalReports.Engine.SortFields crystalSortFields = report.DataDefinition.SortFields;
if (crystalSortFields != null)
    foreach (CrystalDecisions.CrystalReports.Engine.SortField crystalSortField in crystalSortFields)
        switch (crystalSortField.SortDirection)
            case CrystalDecisions.Shared.SortDirection.AscendingOrder:
                break;
            case CrystalDecisions.Shared.SortDirection.DescendingOrder:
                break;
            case CrystalDecisions.Shared.SortDirection.TopNOrder:
            case CrystalDecisions.Shared.SortDirection.BottomNOrder:
            default:
                break;
After some searching, and some trial and error, I found a solution:
using System.Reflection;
using System.Runtime.InteropServices;
using CrystalDecisions.ReportAppServer.DataDefModel;
CrystalDecisions.CrystalReports.Engine.SortFields crystalSortFields = report.DataDefinition.SortFields;
if (crystalSortFields != null)
    foreach (CrystalDecisions.CrystalReports.Engine.SortField crystalSortField in crystalSortFields)
        if (crystalSortField.SortType == CrystalDecisions.Shared.SortFieldType.GroupSortField)
            MethodInfo getRasSort = crystalSortField.GetType().GetMethod("get_RasSort", BindingFlags.NonPublic | BindingFlags.Instance);
            object rasSort = getRasSort.Invoke(crystalSortField, System.Type.EmptyTypes);
            IntPtr iunkwn = Marshal.GetIUnknownForObject(rasSort);
            switch ((CrSortDirectionEnum)((dynamic)rasSort).Direction)
                case CrSortDirectionEnum.crSortDirectionAscendingOrder:
                    break;
                case CrSortDirectionEnum.crSortDirectionDescendingOrder:
                    break;
                case CrSortDirectionEnum.crSortDirectionBottomNOrder:
                case CrSortDirectionEnum.crSortDirectionBottomNPercentage:
                case CrSortDirectionEnum.crSortDirectionNoSortOrder:
                case CrSortDirectionEnum.crSortDirectionTopNOrder:
                case CrSortDirectionEnum.crSortDirectionTopNPercentage:
                default:
                    break;
BTW, this is VS2010 w/ CR for VS2010.

Hello Pablo
Many, many thanks for sharing this solution. I'm going to make a KB out of this as it is a good piece of knowledge to capture.
Happy coding,
Ludek
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