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填充网格视图，然后在单元格上单击我在单元格单击事件上填充文本框，例如，

   private void dgvCompany_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            int i = dgvCompany.SelectedCells[0].RowIndex;
            ID = dgvCompany.Rows[i].Cells[0].Value.ToString();
            txtCompanyName.Text = dgvCompany.Rows[i].Cells[1].Value.ToString();
            txtContactName.Text = dgvCompany.Rows[i].Cells[2].Value.ToString();
            txtContactPersonPhone.Text = dgvCompany.Rows[i].Cells[3].Value.ToString();
            txtAddress.Text = dgvCompany.Rows[i].Cells[4].Value.ToString();
            txtCity.Text = dgvCompany.Rows[i].Cells[5].Value.ToString();
            txtPhone.Text = dgvCompany.Rows[i].Cells[6].Value.ToString();
            cbIsActive.Checked = Convert.ToBoolean(dgvCompany.Rows[i].Cells[7].Value);
        }

这里 ID 是填充文本框后的字符串变量，我编辑并保存更新，然后像以前的方法一样重新填充网格，

public void FillCompanyInfo()
        {
            DataTable dtCompanyInfo = objFunctions.GetCompanyInfo();
            if(dtCompanyInfo.Rows.Count>0)
            {

                dgvCompany.DataSource = dtCompanyInfo;
                if (this.dgvCompany.Columns.Count == 8)
                {
                    DataGridViewCheckBoxColumn checkColumn = new DataGridViewCheckBoxColumn();
                    checkColumn.Name = "";
                    checkColumn.HeaderText = "Select";
                    checkColumn.Width = 50;
                    checkColumn.ReadOnly = false;
                    checkColumn.FillWeight = 10; //if the datagridview is resized (on form resize) the checkbox won't take up too much; value is relative to the other columns' fill values\\
                    dgvCompany.Columns.Add(checkColumn);
                }
            }
        }

在这里，我使用 if 条件将列计数为 8，因为每次它添加列 Select 并在我单击网格和单元格单击事件触发后再次填充网格后导致错误，

在线的 ，

 ID = dgvCompany.Rows[i].Cells[0].Value.ToString();

找不到对象引用，因为它在单元格 0 上为空，而在单元格单击更新之前它工作正常，当我使用断点时，我在单元格 [1] 上获取 ID，而单元格 [0] 为空

我不理解这个错误

希望你的建议

谢谢

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0 回答 0