(转)导出EXCEL时科学计数法问题

//1） 文本：vnd.ms-excel.numberformat:@

//2） 日期：vnd.ms-excel.numberformat:yyyy/mm/dd

//3） 数字：vnd.ms-excel.numberformat:#,##0.00

//4） 货币：vnd.ms-excel.numberformat:￥#,##0.00

//5） 百分比：vnd.ms-excel.numberformat: #0.00%

HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/vnd.ms-xls";
HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(excelname + ".xls"));
StringBuilder table = new StringBuilder();
DataTable dt = ds.Tables[0];
table.Append("<table style='border:1px solid #000000'><tr>");
for (int i = 0; i < dt.Columns.Count; i++)
{
table.Append("<td>");
table.Append(dt.Columns[i].Caption.ToString()); //标格的标题
table.Append("</td>");
}
table.Append("</tr>");
for (int i = 0; i < dt.Rows.Count; i++)
{
table.Append("<tr>");
for (int j = 0; j < dt.Columns.Count; j++)
{
table.Append("<td style='vnd.ms-excel.numberformat:@'>");
table.Append(dt.Rows[i][j].ToString());
table.Append("</td>");
}
table.Append("</tr>");
}
table.Append("</table>");
return table.ToString();
HttpContext.Current.Response.Write(table);
HttpContext.Current.Response.End();