C#窗体-如何获取单元格的上一个/旧的值

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex >= 0 && e.ColumnIndex >= 0) // 确保不是表头单元格
    {
        DataGridViewCell currentCell = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
        DataGridViewCell oldCell = currentCell.Clone() as DataGridViewCell;
        oldCell.Value = currentCell.OldValue; // 获取旧值

        // 处理旧值和当前值
        string oldValue = oldCell.Value.ToString();
        string currentValue = currentCell.Value.ToString();

        // 在这里可以进行你想要的操作，比如打印旧值和当前值
        Console.WriteLine("旧值：" + oldValue);
        Console.WriteLine("当前值：" + currentValue);
    }
}