如何在winforms中为网格的背景色添加填充

dataGridView1.DefaultCellStyle.BackColor = Color.Yellow;

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
    {
        // 获取当前单元格
        DataGridViewCell cell = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];

        // 设置填充效果
        using (SolidBrush brush = new SolidBrush(Color.LightGray))
        {
            e.Graphics.FillRectangle(brush, e.CellBounds);
        }

        // 绘制文本
        if (cell.Value != null)
        {
            using (StringFormat format = new StringFormat())
            {
                format.Alignment = StringAlignment.Center;
                format.LineAlignment = StringAlignment.Center;
                e.Graphics.DrawString(cell.Value.ToString(), e.CellStyle.Font, Brushes.Black, e.CellBounds, format);
            }
        }

        e.Handled = true;
    }
}