private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)        {            if (e.RowIndex >= 0 && e.ColumnIndex >= 0 && e.Value.ToString() != string.Empty)            {                //if (!string.IsNullOrEmpty(this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString()) && this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value != null)                //{
                    #region                int UpRows = 0;//上面相同的行数                int DownRows = 0;//下面相同的行数                int count = 0;//总行数                int cellwidth = e.CellBounds.Width;//列宽                //获取下面的行数                for (int i = e.RowIndex; i < this.dataGridView1.Rows.Count; i++)                {                    if (this.dataGridView1.Rows[i].Cells[e.ColumnIndex].Value.ToString().Equals(e.Value.ToString()))                    {                        DownRows++;                    }                    else                    {                        break;                    }                }                //获取上面的行数                for (int i = e.RowIndex; i >= 0; i--)                {                    if (this.dataGridView1.Rows[i].Cells[e.ColumnIndex].Value.ToString().Equals(e.Value.ToString()))                    {                        UpRows++;                    }                    else                    {                        break;                    }                }                count = UpRows + DownRows - 1;//总行数                //if (count < 2)                //{ return; }                using (Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor), backColorBrush = new SolidBrush(e.CellStyle.BackColor))                {                    using (Pen gridLinePen = new Pen(gridBrush))                    {                        //this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = this.dataGridView1.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value;                        //this.dataGridView1.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value = DBNull.Value;                        //清除单元格                        e.Graphics.FillRectangle(backColorBrush, e.CellBounds);                        if (e.Value != null)                        {                            int cellheight = e.CellBounds.Height;                            SizeF size = e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font);                            //if (e.RowIndex > 0 && this.dataGridView1.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value.ToString() == e.Value.ToString())                            //{                            //}                            //else                            //{
                                e.Graphics.DrawString((e.Value).ToString(), e.CellStyle.Font, Brushes.Black, e.CellBounds.X + (cellwidth - size.Width) / 2, e.CellBounds.Y - cellheight * (UpRows - 1) + (cellheight * count - size.Height) / 2, StringFormat.GenericDefault);                            //}                        }                        //如果下一行数据不等于当前行数据，则画当前单元格底边线                        if (e.RowIndex < this.dataGridView1.Rows.Count - 1 && this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString() != e.Value.ToString())                        {                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);                        }                        if (e.RowIndex == this.dataGridView1.Rows.Count - 1)                        {                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left + 2, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);                            count = 0;                        }                        //画grid右边线                        //e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);                        e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom);                        e.Handled = true;                    }                }                #endregion                //}            }        }

最近整理自己写过的代码，发现datagridview行合并代码，已忘记是摘抄的网上的资料还是自己写的了，故此处无法写明参考自何处，如有哪位网友发现来源，麻烦请告知。在下还是很支持正版的。（整理进自己的博客里，方便查看阅读。O(∩_∩)O~~）