Repeater 合并单元格

前途页面：

 <asp:Repeater ID="rptList" runat="server" OnPreRender="rptList_PreRender">
                <ItemTemplate>
                <tr>
                    <td align="center" runat="server" id="Num">
                        <%#Eval("Num")%>
                    </td>
                    <td align="center" runat="server" id="ProClassification">
                        <%#Eval("ProClassification")%>
                    </td>
                    <td align="center" runat="server" id="ProName">
                        <%#Eval("ItemName")%>
                    </td>
                    <td align="center" runat="server" id="Unit">
                        <%#Eval("Unit")%>
                    </td>
                    <td align="center" runat="server" id="Quantity">
                        <%#Eval("Quantity")%>
                    </td>
                </tr>
                </ItemTemplate>
            </asp:Repeater>

注意点：

1）绑定Repeater控件的OnPreRender方法

2）td单元格添加runat="server"和id属性

后台页面：
　　

        protected void rptList_PreRender(object sender, EventArgs e)
        {
            string[] IDs = { "Num", "ProClassification", "ProName", "Unit", "Quantity" };
            for (int i = rptList.Items.Count - 1; i > 0; i--)
            {
                for (int j = 0; j < IDs.Length; j++)
                {
                    //IDs[j]是需要合并列的列名
                    HtmlTableCell oCell_previous = rptList.Items[i - 1].FindControl(IDs[j]) as HtmlTableCell;
                    HtmlTableCell oCell = rptList.Items[i].FindControl(IDs[j]) as HtmlTableCell;
                    if (oCell_previous != null && oCell != null)
                    {
                        oCell.RowSpan = (oCell.RowSpan == -1) ? 1 : oCell.RowSpan;
                        oCell_previous.RowSpan = (oCell_previous.RowSpan == -1) ? 1 : oCell_previous.RowSpan;

                        if (oCell.InnerText == oCell_previous.InnerText)
                        {
                            if (oCell.InnerText.Trim()!="")//空单元格不执行合并操作
                            {
                                oCell.Visible = false;
                                oCell_previous.RowSpan += oCell.RowSpan;
                            }                            
                        }
                    }
                }           
                               
            }
        }