以编程方式设置C#窗体时，DataGridViewComboBoxCell值未更新

Question

我已经阅读了关于这个该死的控件（DataGridViewComboBoxCell）的所有类似帖子，并以编程方式设置了它的值，但实现所有建议都没有奏效。我可能会更改UI来解决这个问题，但我不喜欢被打败！

  private void PopulateAreaForRoleAssociation()
    {
        // If businessRoleList is null then no data has been bound to the dgv so return
        if (businessRoleList == null)
            return;
        // Ensure businessArea repository is instantiated
        if (businessAreaRepository == null)
            businessAreaRepository = new BusinessAreaRespository();
        // Get a reference to the combobox column of the dgv
        DataGridViewComboBoxColumn comboBoxBusinessAreaColumn = (DataGridViewComboBoxColumn)dgvBusinessRole.Columns["BusinessArea"];
        // Set Datasource properties to fill combobox
        comboBoxBusinessAreaColumn.DisplayMember = "Name";
        comboBoxBusinessAreaColumn.ValueMember = "Id";
        comboBoxBusinessAreaColumn.ValueType = typeof(Guid);
        // Fill combobox with businessarea objects from list out of repository
        comboBoxBusinessAreaColumn.DataSource = businessAreaRepository.GetAll();
        // loop through the businessRoles list which the dgv is bound to and get out each dgv row based upon the current id in the loop
        businessRoleList.Cast<BusinessRole>().ToList().ForEach(delegate(BusinessRole currentRole)
        {
            DataGridViewRow currentRowForRole = dgvBusinessRole.Rows.Cast<DataGridViewRow>().ToList().Find(row => ((BusinessRole)row.DataBoundItem).Id == currentRole.Id);
            // Get a reference to the comboBox cell in the current row
            DataGridViewComboBoxCell comboBoxCell = (DataGridViewComboBoxCell)currentRowForRole.Cells[2];
            // Not sure if this is necessary since these properties should be inherited from the combobox column properties
            comboBoxCell.DisplayMember = "Name";
            comboBoxCell.ValueMember = "Id";
            comboBoxCell.ValueType = typeof(Guid);
            // Get the business area for the current business role
            BusinessArea currentAreaForRole = businessAreaRepository.FetchByRoleId(currentRole.Id);
            // if the role has an associated area then set the value of the cell to be the appropriate item in the combobox
            // and update the cell value
            if (currentAreaForRole != null)
            {
                foreach (BusinessArea area in comboBoxCell.Items)
                {
                    if (currentAreaForRole.Id == area.Id)
                    {
                        comboBoxCell.Value = area.Id;
                        dgvBusinessRole.UpdateCellValue(2, comboBoxCell.RowIndex);
                    }
                }
            }
        });
    }

dgv首先被绑定到一个包含BusinessRole对象的绑定列表，然后combobox列被绑定到来自存储库类的BusinessArea对象的基本列表。然后，我循环遍历bindinglist，并拉出绑定到bindinglist循环中当前项的dgv行。对于该行，我进行数据库调用，查看BusinessRole实体是否与BusinessArea实体相关联。如果是，那么我想在包含BusinessArea的组合框列中选择项目。

问题是，当加载网格时，所有数据都在那里，并且组合框中填充了可用区域的列表，但设置的任何值都不会显示。设置值的代码肯定会被命中，而我正在设置的值肯定存在于列表中。

没有数据错误，什么都没有。它只是拒绝使用我通过编程设置的值更新UI。

如有任何帮助，我们将一如既往地不胜感激。

感谢

Answer 1

这段代码适用于我所在行中的第一个组合框和下面的代码，但我尝试使用该行中的下一个组合框，但它不起作用。我可以使用其他的帮助，我还有3个要做。我确实在这个表单的第二个表单上设置了组合框，代码与尝试块的最后一行相同，但使用的是单元格信息，而不是数据集

 try
      {
          string strQuery = "select fundCode from vwDefaultItems where IncomeType = '" + stIncome + "'";
          SqlDataAdapter daDefault = new SqlDataAdapter(strQuery, conn);
          DataSet dsDefault = new DataSet();
          daDefault.Fill(dsDefault);
          strDefFund = dsDefault.Tables[0].Rows[0].ItemArray[0].ToString();
          dgvCheckEntry.Rows[curRow].Cells[7].Value = dsDefault.Tables[0].Rows[0].ItemArray[0].ToString();

      }
      catch (Exception eq)
      {
      }