DataGridViewComboBoxCell ничего не отображает

Question

У меня есть dataGridView с множеством столбцов, все связаны с источником данных с помощью dataPropertyName.

В datagridviewcombobox должен отображаться список элементов (эти элементы имеют несколько свойств, одно свойство ID и одно свойство Name, которое также хранится в источнике данных сетки данных.

В соответствии сзначение, которое я устанавливаю для каждой ячейки datagridviewbomboboxcell, я хочу, чтобы отображалось соответствующее имя свойства.

Все работает, значение во всех datagridviewcombobcecells верно, я устанавливаю элемент display и value. Так почему datagridviewcombobox не отображаетсячто-нибудь?

Я посмотрел большинство найденных тем, но не смог найти решение.

Заранее спасибо за помощь.

       List<ProcessGroup> processGroups = _context.ProcessGroup.ToList();

        _ds = new List<TestRessourceDetailsModel>();

        for (int i = 0; i < processGroups.Count; i++)
        {
            List<IntrusionBody> ibs = null;
            int? id = _curTestRes.TestResourceProcessGroup.OrderBy(x => x.ProcessGroupID).Where(y => y.ProcessGroupID == i + 1).FirstOrDefault()?.ID;
            if (_view.Cb_Location.SelectedItem != null)
            {
                if (_curTestRes != null)
                {
                    ibs = _context.IntrusionBody.Where(x => x.ProcessGroupID == i + 1 && x.ToDate == null && (x.TestRessourceProcessGroupID == null || x.TestRessourceProcessGroupID == id)).ToList();
                }
                else
                {
                    ibs = _context.IntrusionBody.Where(x => x.ProcessGroupID == i + 1 && ((Location)_view.Cb_Location.SelectedItem).ID == x.LocationID && x.ToDate == null && x.TestRessourceProcessGroupID == null).ToList();
                }
            }
            else
            {
                    ibs = _context.IntrusionBody.Where(x => x.ProcessGroupID == i + 1 && x.ToDate == null && x.TestRessourceProcessGroupID == null || x.TestRessourceProcessGroupID == id).ToList();
            }

            _ds.Add(new TestRessourceDetailsModel
            {
                ProcessGroup = processGroups[i].Name,
                E_DIN = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "E (DIN)").FirstOrDefault()?.Activated,
                E_U_DIN = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "E+U (DIN)").FirstOrDefault()?.Activated,
                R_DIN = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "R (DIN)").FirstOrDefault()?.Activated,
                E_REF_DIN = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "E (Ref. DIN)").FirstOrDefault()?.Activated,
                E_ASTM = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "E (ASTM)").FirstOrDefault()?.Activated,
                E_U_ASTM = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "E+U (ASTM)").FirstOrDefault()?.Activated,
                R_ASTM = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "R (ASTM)").FirstOrDefault()?.Activated,
                E_REF_ASTM = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestOptionTestRessourceProcessGroup.Where(x => x.TestOption.Name == "E (Ref. ASTM)").FirstOrDefault()?.Activated,
                NrOfImpressions = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.NrOfImpressions,
                TestsPerDay = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.NrOfTestPerDay,
                IntrusionBody = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.IntrusionBody.Where(x => x.ToDate == null).FirstOrDefault(),
                IntrusionBodies = ibs,
                DINLocked = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.DINLocked,
                ASTMLocked = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.ASTMLocked,
                Active = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.Active,
                IsCertifiedDin = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestResourceProcessGroupCertification.Where(x => x.Date.Year == DateTime.Now.Year).FirstOrDefault()?.DIN,
                IsCertifiedAstm = processGroups[i].TestResourceProcessGroup.Where(x => x.TestResourceID == _curTestRes?.ID).FirstOrDefault()?.TestResourceProcessGroupCertification.Where(x => x.Date.Year == DateTime.Now.Year).FirstOrDefault()?.ASTM
            });

        }

        _view.Dgv_ProcessGroups.AutoGenerateColumns = false;
        _view.Dgv_ProcessGroups.DataSource = _ds;




        ((DataGridViewCheckBoxColumn)_view.Dgv_ProcessGroups.Columns[13]).ThreeState = true;
        ((DataGridViewCheckBoxColumn)_view.Dgv_ProcessGroups.Columns[14]).ThreeState = true;


        foreach (DataGridViewRow row in _view.Dgv_ProcessGroups.Rows)
        {
            ((TestRessourceDetailsModel)row.DataBoundItem).IntrusionBodies.Insert(0, new IntrusionBody { ID = 999999, Name = "" });

            ((DataGridViewComboBoxCell)row.Cells[12]).DataSource = ((TestRessourceDetailsModel)row.DataBoundItem).IntrusionBodies;

            ((DataGridViewComboBoxCell)row.Cells[12]).DisplayMember = "Name";
            ((DataGridViewComboBoxCell)row.Cells[12]).ValueMember = "ID";

            if (((TestRessourceDetailsModel)row.DataBoundItem).IntrusionBody != null)
            {
                ((DataGridViewComboBoxCell)row.Cells[12]).Value = ((TestRessourceDetailsModel)row.DataBoundItem).IntrusionBody?.ID;
            }
            else if (((TestRessourceDetailsModel)row.DataBoundItem).IntrusionBodies.Count > 0)
            {
                ((DataGridViewComboBoxCell)row.Cells[12]).Value = ((TestRessourceDetailsModel)row.DataBoundItem).IntrusionBodies.First().ID;
            }
        }