数据的动态合并和导出至EXCEL

最近一段时间都在处理数据的动态合并和导出EXCEL的问题，写个demo记录下，希望和我碰到同样问题的博友可以顺利解决；后面会提供demo下载链接。

（VS2012，ASP.NET）

一、主要解决以下问题：

1、根据业务逻辑动态合并table单元格
2、动态合并后序号重写
3、datatable导出excel
4、datatable导出excel特殊字符处理
5、在实际问题中可能还有少许BUG，自行调试

二、重要代码摘录：

1、前台获取table HTML代码： 

<input type="hidden" runat="server" id="lblTableHtml" />

function getDataHtml() {
            var table = document.getElementById("gridTable");
            if (table != null) {
                var html = table.innerHTML;
                document.getElementById("lblTableHtml").value = html;
            }
        }

 2、自定义合并单元格：

// 1、通过关联字段分组
                for (int i = gridTable.Rows.Count - 1; i > 0; i--)
                {
                    HtmlTableCell oCell_previous = gridTable.Rows[i - 1].Cells[4];
                    HtmlTableCell oCell = gridTable.Rows[i].Cells[4];
                    if (oCell_previous != null && oCell != null)
                    {
                        if (oCell.InnerText == oCell_previous.InnerText)
                        {
                            for (int j = 4; j <= 7; j++)
                            {
                                HtmlTableCell oCell_previousI = gridTable.Rows[i - 1].Cells[j];
                                HtmlTableCell oCellI = gridTable.Rows[i].Cells[j];
                                if (oCell_previousI != null && oCellI != null)
                                {
                                    oCell_previousI.RowSpan = (oCell_previousI.RowSpan == -1) ? 1 : oCell_previousI.RowSpan;
                                    oCellI.RowSpan = (oCellI.RowSpan == -1) ? 1 : oCellI.RowSpan;
                                }

                                oCellI.Visible = false;
                                oCell_previousI.RowSpan += oCellI.RowSpan;
                            }
                        }
                    }
                }

3、导出EXCEL逻辑：

Response.Clear();
            Response.ContentType = "application/vnd.ms-excel";
            string excelname = sFileName + DateTime.Now.ToString("yyyyMMddHHmmss");
            Response.AddHeader("content-disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(excelname, System.Text.Encoding.UTF8) + ".xls");
            this.EnableViewState = false;
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter writer = new System.Web.UI.HtmlTextWriter(oStringWriter);
            System.Text.StringBuilder builder = new System.Text.StringBuilder();
            builder.Append("<table border='1'>");
            // 取出已经排好版的table
            string sHtml = lblTableHtml.Value;
            builder.Append(sHtml);
            builder.Append("</table>");
            writer.Write(builder.ToString());
            writer.Close();
            Response.Write(oStringWriter.ToString());
            Response.End();

三、Demo下载链接：

 https://files.cnblogs.com/files/zhaosx/ExcelExportDemo.zip