用鼠标右键选择DataGridView单元格或行

//右键可选中单元格
        private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right && e.Clicks == 1)
            {
                dataGridView1.CurrentCell.Selected = false;
                dataGridView1.CurrentCell = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
                dataGridView1.CurrentCell.Selected = true;
            }
        }