更改DataGridView单元格中按钮的颜色

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.ColumnIndex == buttonColumn.Index && e.RowIndex >= 0)
    {
        DataGridViewButtonCell cell = (DataGridViewButtonCell)dataGridView1[e.ColumnIndex, e.RowIndex];
        Rectangle rect = dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, true);
        rect.X += 4;
        rect.Y += 4;
        rect.Width -= 8;
        rect.Height -= 8;
        using (SolidBrush brush = new SolidBrush(Color.Red))
        {
            e.Graphics.FillRectangle(brush, rect);
        }
        e.Paint(rect, DataGridViewPaintParts.Border);
        e.Handled = true;
    }
}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex == buttonColumn.Index && e.RowIndex >= 0)
    {
        DataGridViewButtonCell cell = (DataGridViewButtonCell)dataGridView1[e.ColumnIndex, e.RowIndex];
        cell.Style.BackColor = Color.Green;
        dataGridView1.InvalidateCell(e.ColumnIndex, e.RowIndex);
    }
}