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%

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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();