DataGridViewComboBoxCell populated but will not display content

Question

I am trying to dynamically set a custom dropdownlist for one of my datagridview columns which I set as a ComboBoxcolumn. When I run my application I see that there are values in my cell. However, I see no values pop up in the UI.

private void CustomComboBoxColumns(string filter)
    {
        DataGridViewComboBoxColumn ComboBoxColumn = new DataGridViewComboBoxColumn();
        DataTable dt;
        ComboBoxColumn.HeaderText = "category";
        ComboBoxColumn.DataPropertyName = "category";
        ComboBoxColumn.ReadOnly = false;
        ComboBoxColumn.MaxDropDownItems = 100;
        ComboBoxColumn.AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
        ComboBoxColumn.FlatStyle = FlatStyle.Flat;
        ComboBoxColumn.ValueMember = "category";
        ComboBoxColumn.DisplayMember = "category";
        _iprDataGridView.Columns.Insert(16, ComboBoxColumn);
        for (int i = 0; i < _iprDataGridView.Rows.Count; i++)
        {
            dt = GetDataForCategory(filter);
            ((DataGridViewComboBoxCell)_iprDataGridView.Rows[i].Cells[16]).DataSource = dt;
        }
    }

    private DataTable GetDataForCategory(string filter)
    {
        DbConnection db = new DbConnection();
        string connString = db.BuildConnectionString();
        DataTable dt = new DataTable();
        DataSet ds = new DataSet();
        string query = "Select category from cd_category where category like '%" + filter + "%' order by category";
        using (SqlConnection conn = new SqlConnection(connString))
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }

            SqlDataAdapter da = new SqlDataAdapter(query, conn);
            da.Fill(ds, "category");
            dt = ds.Tables["category"];
            da.Dispose();
            conn.Close();
        }
        return dt;
    }

When I attach my debugger and check ((DataGridViewComboBoxCell)_iprDataGridView.Rows[i].Cells[16]).DataSource = dt; there are values in my item collection it just will not display it.

Here is more code on how the datagridview is set up.

_iprDataGridView.DataSource = _dbHelper.Select(queryBuild.ToString(), parameters, dbConnection);

            if (_iprDataGridView.DataSource == null) return;
            // In order to display and match the PIR table values, that are requried to be in
            // a comboBox menu, we need to remove the columns that have been populated and then
            // re-add them as comboBoxs
            ConfigureDataGridView();
            ConfigureComboBoxColumns();
            ConfigureTextBoxColumns();

I am thinking after the ConfigureTextBoxColumns() I will create my method that will iterate through the datagridview and create a new category comboboxcolumn and insert a new comboboxcell depending on another columns value.

Here is the code for how the columns are generated for the datagridview

private void ConfigureComboBoxColumns()
    {
        DataGridViewHelper dataGridViewHelper = new DataGridViewHelper();
        // Columns being converted to comboboxcolumns must be removed, created, and re-inserted
        dataGridViewHelper.RemoveColumns(ref _iprDataGridView,
                                         Columns.severity.ToString(),
                                         Columns.phase.ToString(),
                                         Columns.app.ToString(),
                                         Columns.project.ToString(),
                                         Columns.acceptancePeriod.ToString(),
                                         Columns.classConfirmed.ToString(),
                                         Columns.oncall.ToString(),
                                         Columns.warranty.ToString(),
                                         Columns.release.ToString(),
                                         Columns.category.ToString(),
                                         Columns.ticketType.ToString());

        DataGridViewComboBoxColumn comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.severity.ToString());
        comboBoxColumn.ValueType = typeof(int);
        string query = IPRDetailsConstants.SELECT_SEVERITY + IPRDetailsConstants.SEVERITY_COL;
        dataGridViewHelper.SetComboBoxChoicesDataSource(ref comboBoxColumn, Columns.severity.ToString(), query, dbConnection);
        _iprDataGridView.Columns.Insert((int)Columns.severity, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.phase.ToString());
        query = IPRDetailsConstants.SELECT_PHASE + IPRDetailsConstants.PHASE_COL;
        dataGridViewHelper.SetComboBoxChoicesDataSource(ref comboBoxColumn, Columns.phase.ToString(), query, dbConnection);
        _iprDataGridView.Columns.Insert((int)Columns.phase, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.app.ToString());
        query = IPRDetailsConstants.SELECT_APP + IPRDetailsConstants.APP_COL;
        dataGridViewHelper.SetComboBoxChoicesDataSource(ref comboBoxColumn, Columns.app.ToString(), query, dbConnection);
        _iprDataGridView.Columns.Insert((int)Columns.app, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.project.ToString());
        bool activeProjectsOnly = bool.Parse(ConfigurationManager.AppSettings.Get("ActiveProjectsOnly"));
        query = IPRDetailsConstants.SELECT_PROJECT + (activeProjectsOnly ? IPRDetailsConstants.PROJECT_COL_ACTIVE : IPRDetailsConstants.PROJECT_COL);
        dataGridViewHelper.SetComboBoxChoicesDataSource(ref comboBoxColumn, Columns.project.ToString(), query, dbConnection);
        _iprDataGridView.Columns.Insert((int)Columns.project, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.acceptancePeriod.ToString());
        comboBoxColumn.HeaderText = Resources.IprDetails_ConfigureComboBoxColumns_ap;
        comboBoxColumn.HeaderCell.ToolTipText = "acceptancePeriod";
        dataGridViewHelper.SetComboBoxChoicesStatic(ref comboBoxColumn, Columns.acceptancePeriod.ToString(), Resources.Y, Resources.N, Resources.S, Resources.X);
        _iprDataGridView.Columns.Insert((int)Columns.acceptancePeriod, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.classConfirmed.ToString());
        comboBoxColumn.HeaderText = Resources.IprDetails_ConfigureComboBoxColumns_cc;
        comboBoxColumn.HeaderCell.ToolTipText = "classConfirmed";
        dataGridViewHelper.SetComboBoxChoicesStatic(ref comboBoxColumn, Columns.classConfirmed.ToString(), Resources.Y, Resources.N, Resources.X);
        _iprDataGridView.Columns.Insert((int)Columns.classConfirmed, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.oncall.ToString());
        comboBoxColumn.HeaderText = Resources.IprDetails_ConfigureComboBoxColumns_oc;
        comboBoxColumn.HeaderCell.ToolTipText = "onCall";
        dataGridViewHelper.SetComboBoxChoicesStatic(ref comboBoxColumn, Columns.oncall.ToString(), Resources.Y, Resources.N, Resources.X);
        _iprDataGridView.Columns.Insert((int)Columns.oncall, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.warranty.ToString());
        comboBoxColumn.HeaderText = Resources.IprDetails_ConfigureComboBoxColumns_w;
        comboBoxColumn.HeaderCell.ToolTipText = "warranty";
        dataGridViewHelper.SetComboBoxChoicesStatic(ref comboBoxColumn, Columns.warranty.ToString(), Resources.Y, Resources.N, Resources.X);
        _iprDataGridView.Columns.Insert((int)Columns.warranty, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.ticketType.ToString());
        comboBoxColumn.HeaderText = Resources.IprDetails_ConfigureComboBoxColumns_tt;
        comboBoxColumn.HeaderCell.ToolTipText = "ticketType";
        dataGridViewHelper.SetComboBoxChoicesStatic(ref comboBoxColumn, Columns.ticketType.ToString(), "I", "P", "R", "K", "Q");
        _iprDataGridView.Columns.Insert((int)Columns.ticketType, comboBoxColumn);

        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.release.ToString());
        bool activeReleasesOnly = bool.Parse(ConfigurationManager.AppSettings.Get("ActiveReleasesOnly"));
        query = IPRDetailsConstants.SELECT_RELEASE + (activeReleasesOnly ? IPRDetailsConstants.RELEASE_COL_ACTIVE : IPRDetailsConstants.RELEASE_COL);
        dataGridViewHelper.SetComboBoxChoicesDataSource(ref comboBoxColumn, Columns.release.ToString(), query, dbConnection);
        _iprDataGridView.Columns.Insert((int)Columns.release, comboBoxColumn);

        /*
        comboBoxColumn = dataGridViewHelper.CreateComboBoxColumn(Columns.category.ToString());
        query = IPRDetailsConstants.SELECT_CATEGORY + IPRDetailsConstants.CATEGORY_COL;
        dataGridViewHelper.SetComboBoxChoicesDataSource(ref comboBoxColumn, Columns.category.ToString(), query, dbConnection);
        _iprDataGridView.Columns.Insert((int)Columns.category, comboBoxColumn);
        */

    }

I commented out their column for categories to insert my own. I am updating this application which was not developed by me.

DataGridViewComboBoxCell populated but will not display content

Answers (1)

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