设置DataGridview行的字体颜色

private void dgv_DataSourceChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < dgv.Rows.Count; i++)
            {
                string CY = (Decimal.Parse(dgv.Rows[i].Cells["MESLPSL"].Value.ToString()) + Decimal.Parse(dgv.Rows[i].Cells["MESFPSL"].Value.ToString() == "" ? "0" : dgv.Rows[i].Cells["MESFPSL"].Value.ToString())
                    - Decimal.Parse(dgv.Rows[i].Cells["SAPLPSL"].Value.ToString() == "" ? "0" : dgv.Rows[i].Cells["SAPLPSL"].Value.ToString()) - Decimal.Parse(dgv.Rows[i].Cells["SAPFPSL"].Value.ToString() == "" ? "0" : dgv.Rows[i].Cells["SAPFPSL"].Value.ToString())).ToString();

                dgv.Rows[i].Cells["CY"].Value = CY;
                if (CY != "0")
                {
                    dgv.Rows[i].DefaultCellStyle.ForeColor = System.Drawing.Color.Red;
                }
                else
                {
                    dgv.Rows[i].DefaultCellStyle.ForeColor = System.Drawing.Color.Green;
                }
            }
        }