改变DataGridView中行的顺序

/*DataGridView 实现行[Row]的上下移动,我这里用到了SelectedRows[0],而没用CurrentRow是有原因的
主要是这两段代码:
dataGridView1.Rows[rowIndex - 1].Selected = true;
dataGridView1.Rows[rowIndex].Selected = false;
这两行代码大家因该都能看懂,移上去的哪行选中状态,移下去的的取消选中状态.
如果我用dataGridView1.CurrentRow.Cell[0].Value 他取得的值仍然是rowIndex索引行的值

要使用SelectedRows[0] ,就必须设置这个属性:dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

实现原理:就是上下两行,把单元格中的值进行交换...呵呵表面上看去是向上,下移动了

不知道大家还有什么好的选中方法没...请多多指教

*/

private void Form3_Load(object sender, EventArgs e)
{
//........得到DataTable的代码省略....
dataGridView1.DataSource = dt;
}

 /// <summary>
        /// 单元格上移
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Up_Click(object sender, EventArgs e)
        {
            int rowIndex;
            DataGridViewSelectedRowCollection selectedRow = this.dgv_SalaryItem.DataGrid.SelectedRows;
            if (selectedRow.Count > 0)
            {
                rowIndex = this.dgv_SalaryItem.DataGrid.SelectedRows[0].Index;
            }
            else
            {
                var dataGridViewRow = this.dgv_SalaryItem.DataGrid.CurrentRow;
                if (dataGridViewRow != null)
                {
                    rowIndex = dataGridViewRow.Index;
                }
                else
                {
                    CustMessage.ShowAlertMessage("请选择一行数据。");
                    return;
                }
            }
            if (rowIndex == 0)
            {
                CustMessage.ShowAlertMessage("已经是第一行了。");
                return;
            }

            List<string> list = new List<string>();
            for (int i = 0; i < dgv_SalaryItem.DataGrid.Columns.Count; i++)
            {
                list.Add(selectedRow.Count > 0
                             ? dgv_SalaryItem.DataGrid.SelectedRows[0].Cells[i].Value.ToString()
                             : dgv_SalaryItem.DataGrid.CurrentRow.Cells[i].Value.ToString());
            }
            for (int j = 0; j < dgv_SalaryItem.DataGrid.Columns.Count; j++)
            {
                dgv_SalaryItem.DataGrid.Rows[rowIndex].Cells[j].Value =
                    dgv_SalaryItem.DataGrid.Rows[rowIndex - 1].Cells[j].Value;
                dgv_SalaryItem.DataGrid.Rows[rowIndex - 1].Cells[j].Value = list[j];
            }
            this.dgv_SalaryItem.DataGrid.CurrentRow.Selected = false;
            dgv_SalaryItem.DataGrid.Rows[rowIndex - 1].Selected = true;
        }

 

 /// <summary>
        /// 单元格下移
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Down_Click(object sender, EventArgs e)
        {
            int rowIndex;
            DataGridViewSelectedRowCollection selectedRow = this.dgv_SalaryItem.DataGrid.SelectedRows;
            if (selectedRow.Count > 0)
            {
                rowIndex = this.dgv_SalaryItem.DataGrid.SelectedRows[0].Index;
            }
            else
            {
                var dataGridViewRow = this.dgv_SalaryItem.DataGrid.CurrentRow;
                if (dataGridViewRow != null)
                {
                    rowIndex = dataGridViewRow.Index;
                }
                else
                {
                    CustMessage.ShowAlertMessage("请选择一行数据。");
                    return;
                }
            }

            if (rowIndex == dgv_SalaryItem.DataGrid.Rows.Count - 1)
            {
                CustMessage.ShowAlertMessage("已经是最后一行了。");
                return;
            }

            List<string> list = new List<string>();
            for (int i = 0; i < dgv_SalaryItem.DataGrid.Columns.Count; i++)
            {
                list.Add(selectedRow.Count > 0
                             ? dgv_SalaryItem.DataGrid.SelectedRows[0].Cells[i].Value.ToString()
                             : dgv_SalaryItem.DataGrid.CurrentRow.Cells[i].Value.ToString());

            }

            for (int j = 0; j < dgv_SalaryItem.DataGrid.Columns.Count; j++)
            {
                dgv_SalaryItem.DataGrid.Rows[rowIndex].Cells[j].Value =
                    dgv_SalaryItem.DataGrid.Rows[rowIndex + 1].Cells[j].Value;
                dgv_SalaryItem.DataGrid.Rows[rowIndex + 1].Cells[j].Value = list[j];
            }
            this.dgv_SalaryItem.DataGrid.CurrentRow.Selected = false;
            dgv_SalaryItem.DataGrid.Rows[rowIndex + 1].Selected = true;
        }