ASPxGridView 中，如何合并列与列之间的虚线？

Question

ASPxGridView 中，如何合并列与列之间的虚线？请大师帮忙！例如：如何把变成

Answer 1

对要去掉的列设置 CellStyle属性 
<dxwgv:GridViewDataTextColumn  Caption="符号" VisibleIndex="2">
       <CellStyle>
       <Border BorderWidth=0 />
       <BorderLeft BorderWidth=0/>
       <BorderRight BorderWidth=0/>
       </CellStyle>
       </dxwgv:GridViewDataTextColumn>

Answer 2

    public class ASPxGridViewCellMerger
    {
        ASPxGridView grid;
        Dictionary<GridViewDataColumn, TableCell> mergedCells = new Dictionary<GridViewDataColumn, TableCell>();
        Dictionary<TableCell, int> cellRowSpans = new Dictionary<TableCell, int>();        public ASPxGridViewCellMerger(ASPxGridView grid)
        {
            this.grid = grid;
            Grid.HtmlRowCreated += new ASPxGridViewTableRowEventHandler(grid_HtmlRowCreated);
            Grid.HtmlDataCellPrepared += new ASPxGridViewTableDataCellEventHandler(grid_HtmlDataCellPrepared);
        }        public ASPxGridView Grid { get { return grid; } }
        void grid_HtmlDataCellPrepared(object sender, ASPxGridViewTableDataCellEventArgs e)
        {
            if (cellRowSpans.ContainsKey(e.Cell))
            {
                e.Cell.RowSpan = cellRowSpans[e.Cell];
            }
        }
        void grid_HtmlRowCreated(object sender, ASPxGridViewTableRowEventArgs e)
        {
            if (Grid.GetRowLevel(e.VisibleIndex) != Grid.GroupCount) return;
            for (int i = e.Row.Cells.Count - 1; i >= 0; i--)
            {
                DevExpress.Web.ASPxGridView.Rendering.GridViewTableDataCell dataCell = e.Row.Cells[i] as DevExpress.Web.ASPxGridView.Rendering.GridViewTableDataCell;
                if (dataCell != null)
                {
                    MergeCells(dataCell.DataColumn, e.VisibleIndex, dataCell);
                }
            }
        }        void MergeCells(GridViewDataColumn column, int visibleIndex, TableCell cell)
        {
            bool isNextTheSame = IsNextColumnHasSameData(column, visibleIndex);
            if (isNextTheSame)
            {
                if (!mergedCells.ContainsKey(column))
                {
                    mergedCells[column] = cell;
                }
            }
            if (IsPrevColumnHasSameData(column, visibleIndex))
            {
                ((TableRow)cell.Parent).Cells.Remove(cell);
                if (mergedCells.ContainsKey(column))
                {
                    TableCell mergedCell = mergedCells[column];
                    if (!cellRowSpans.ContainsKey(mergedCell))
                    {
                        cellRowSpans[mergedCell] = 1;
                    }
                    cellRowSpans[mergedCell] = cellRowSpans[mergedCell] + 1;
                }
            }
            if (!isNextTheSame)
            {
                mergedCells.Remove(column);
            }
        }
        bool IsNextColumnHasSameData(GridViewDataColumn column, int visibleIndex)
        {
            //is it the last visible row
            if (visibleIndex >= Grid.VisibleStartIndex + Grid.VisibleRowCount - 1) return false;
            return IsSameData(column.FieldName, visibleIndex, visibleIndex + 1);
        }
        bool IsPrevColumnHasSameData(GridViewDataColumn column, int visibleIndex)
        {
            ASPxGridView grid = column.Grid;
            //is it the first visible row
            if (visibleIndex <= Grid.VisibleStartIndex) return false;
            return IsSameData(column.FieldName, visibleIndex, visibleIndex - 1);
        }
        bool IsSameData(string fieldName, int visibleIndex1, int visibleIndex2)
        {
            // is it a group row?
            if (Grid.GetRowLevel(visibleIndex2) != Grid.GroupCount) return false;
            return object.Equals(Grid.GetRowValues(visibleIndex1, fieldName), Grid.GetRowValues(visibleIndex2, fieldName));
        }    }

Answer 3

protected void ASPxGridViewDelivery_HtmlRowCreated(object sender, ASPxGridViewTableRowEventArgs e)
        {
            //if the first data row has been added
            if (e.RowType == DevExpress.Web.ASPxGridView.GridViewRowType.Data && e.VisibleIndex == ASPxGridViewDelivery.PageIndex * ASPxGridViewDelivery.SettingsPager.PageSize)
            {
                Table table = e.Row.Parent as Table;
                if (table != null)
                {
                    TableRow row = new TableRow();
                    int index = 0;
                    while (index < ASPxGridViewDelivery.VisibleColumns.Count)
                    {
                        TableCell cell = new TableCell();
                        cell.Text = ASPxGridViewDelivery.VisibleColumns[index++].ToString();
                        if (index < ASPxGridViewDelivery.VisibleColumns.Count)
                        {
                            cell.Text += " - " + ASPxGridViewDelivery.VisibleColumns[index++].ToString();
                            cell.ColumnSpan = 2;
                        }
                        cell.HorizontalAlign = HorizontalAlign.Center;
                        //if it is not the last column
                        if (index < ASPxGridViewDelivery.VisibleColumns.Count)
                        {
                            cell.BorderStyle = BorderStyle.Solid;
                            cell.BorderWidth = Unit.Pixel(0);
                            cell.Style["BORDER-RIGHT-WIDTH"] = "1px";
                            cell.BorderColor = System.Drawing.Color.Gray;
                        }
                        row.Cells.Add(cell);
                    }
                    table.Rows.AddAt(0, row);
                }
            }
        }