DateGridView读取其中一行的一个单元格的值后失去焦点怎么回事

Question

private void DgvHeaders_CellClick_1(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                m_OrderID = this.DgvHeaders.Rows[e.RowIndex].Cells["colOrderID"].Value.ToString();
                string IsOut = this.DgvHeaders.Rows[e.RowIndex].Cells["colIsOut"].Value.ToString();
                _IsOutBound = int.Parse(IsOut);
            }
            catch (Exception ex)
            {
                AppHelper.MsgWarn(ex.Message);
                return;
            }            this.btnOut.Enabled = true;        }
m_OrderID = this.DgvHeaders.Rows[e.RowIndex].Cells["colOrderID"].Value.ToString();
执行完之后就报错了  

Answer 1

看看this.DgvHeaders.Rows[e.RowIndex].Cells["colOrderID"].Value里面的值是否是NULL

Answer 2

看this.DgvHeaders.Rows[e.RowIndex].Cells["colOrderID"]是否为NULL

Answer 3

调试看e.RowIndex的值是多少
用 DgvHeaders.CurrentRow.Index试一下

Answer 4

判断是否为null
DataGridView.ClearSelection();  
DataGridView.CurrentCell = a.Rows[4].Cells[0];设置焦点