如何更改特定的datagridview单元格值？

// 假设datagridView1是要操作的DataGridView对象

// 根据行索引和列索引获取指定单元格
int rowIndex = 0;
int columnIndex = 1;
datagridView1.Rows[rowIndex].Cells[columnIndex].Value = "新的值";

// 根据单元格的唯一标识符获取指定单元格
string cellIdentifier = "cell1";
DataGridViewCell targetCell = datagridView1.Rows
    .Cast<DataGridViewRow>()
    .SelectMany(row => row.Cells.Cast<DataGridViewCell>())
    .FirstOrDefault(cell => cell.Tag != null && cell.Tag.ToString() == cellIdentifier);
if (targetCell != null)
{
    targetCell.Value = "新的值";
}

// 刷新DataGridView
datagridView1.Refresh();