DataGridView 合并同一列中值相同的相邻单元格 合并单元格

         ///   <summary>
         ///  合并同一列中值相同的相邻单元格
         ///   </summary>
         ///   <param name="dgv"> DataGridView </param>
         ///   <param name="columnIndexList"> 要合并的列的索引列表 </param>
         ///   <param name="e"> 当前单元格的属性访问器 </param>
         private  void MergeCellInOneColumn(DataGridView dgv, List< int> columnIndexList, DataGridViewCellPaintingEventArgs e)
        {
             if (columnIndexList.Contains(e.ColumnIndex) && e.RowIndex != - 1)
            {
                Brush gridBrush =  new SolidBrush(dgv.GridColor);
                Brush backBrush =  new SolidBrush(e.CellStyle.BackColor);
                Pen gridLinePen =  new Pen(gridBrush);

                 // 擦除
                e.Graphics.FillRectangle(backBrush, e.CellBounds);

                 // 画右边线
                e.Graphics.DrawLine(gridLinePen,
                   e.CellBounds.Right -  1,
                   e.CellBounds.Top,
                   e.CellBounds.Right -  1,
                   e.CellBounds.Bottom -  1);

                 // 画底边线
                 if ((e.RowIndex < dgv.Rows.Count -  1 && dgv.Rows[e.RowIndex +  1].Cells[e.ColumnIndex].Value.ToString() != e.Value.ToString()) ||
                    e.RowIndex == dgv.Rows.Count -  1)
                {
                    e.Graphics.DrawLine(gridLinePen,
                        e.CellBounds.Left,
                        e.CellBounds.Bottom -  1,
                        e.CellBounds.Right -  1,
                        e.CellBounds.Bottom -  1);
                }

                 // 写文本
                 if (e.RowIndex ==  0 || dgv.Rows[e.RowIndex -  1].Cells[e.ColumnIndex].Value.ToString() != e.Value.ToString())
                {
                    e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
                        Brushes.Black, e.CellBounds.X +  2,
                        e.CellBounds.Y +  5, StringFormat.GenericDefault);
                }

                e.Handled =  true;
            }
        }

 

使用方法

 

         private  void dataGridView1_CellPainting( object sender, DataGridViewCellPaintingEventArgs e)
        {
            List< int> indexs =  new List< int>() {  0,  1 };
            MergeCellInOneColumn(dataGridView1, indexs, e);
        }