HTML Table 输出Excel

string html = RenderControl(this.Page);//获取控件最终呈现的HTML,最好是Table
MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(html));
System.IO.MemoryStream ms = stream;
byte[] bt = ms.ToArray();
//客户端保存的文件名  
//以字符流的形式下载文件    
string file = $"output.xls";
System.Web.HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + file);
System.Web.HttpContext.Current.Response.OutputStream.Write(bt, 0, bt.Length);
this.Response.Flush();
this.Response.End();

public static string RenderControl(Control control)
{StringWriter stringWriter = new StringWriter(CultureInfo.InvariantCulture);HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);control.RenderControl(htmlTextWriter);htmlTextWriter.Flush();htmlTextWriter.Close();return stringWriter.ToString();
}

<table id="tb" style="border-collapse: collapse; width: 100%; line-height: 30px;border:1px solid black;border-color:#000;width:1200px;" ><%--bordercolor="#000000" cellspacing="0" width="300" align="center" bgcolor="#ffffff" border="1"--%><tr><th colspan="<%= dthxry.Rows.Count+8 %>" style="font-size: 20px; height: 60px;border:1px solid black;"><h1><%= sjnf %> 年 <%= jd %> 季度 社区正职/部门正职班子评价得分</h1></th></tr><tr><th rowspan="2" style="<%= css%>">社区</th><th rowspan="2" style="<%= css%>">姓名</th><th rowspan="2" style="<%= css%>">社区包联领导</th><th rowspan="2" style="<%= css%>">包联领导评分（40%）</th><th colspan="<%= dthxry.Rows.Count+2 %>" style="<%= css%>">班子评分（20%）</th><th rowspan="2" style="<%= css%>">线下分（40%）</th><th rowspan="2" style="<%= css%>">综合得分</th></tr><tr><%foreach (System.Data.DataRow r in dthxry.Rows){  %><th style="<%= css%>"><%= r["username"] %></th><%} %><th style="<%= css%>">班子总分</th><th style="<%= css%>">班子平均分（20%）</th></tr><tbody><% foreach (System.Data.DataRow r in dtData.Rows){  %><tr><th style="<%= css%>"><%=r["deptname"] %></th><th style="<%= css%>"><%=r["username"] %></th><th style="<%= css%>">社区包联领导</th><th style="<%= css%>"><%=r["blldpf"] %></th><% foreach (string s in cols){  %><th style="<%= css%>"><%=r[s] %></th><%} %><th style="<%= css%>"><%= ((decimal)r["bzzf"]).ToString("0.##") %></th><th style="<%= css%>"><%=((decimal)r["bzpjf"]).ToString("0.##") %></th><th style="<%= css%>"><%=((decimal)r["xxf"]).ToString("0.##") %></th><th style="<%= css%>"><%=((decimal)r["zhdf"]).ToString("0.##") %></th></tr><%} %></tbody>
</table>