如果有个DataTable类型的数据，可以这样导出到Excel中：

　　　　 public static void ExportToExcel(DataTable dt, string fileName)        {            string outputFileName = null;              string browser = HttpContext.Current.Request.UserAgent.ToUpper();                //消除文件名乱码。如果是IE则编码文件名，如果是FF则在文件名前后加双引号。            if (browser.Contains("MS") == true && browser.Contains("IE") == true)                outputFileName = HttpUtility.UrlEncode(fileName);  //%e5%90%8d%e5%8d%95            else if (browser.Contains("FIREFOX") == true)                  outputFileName = "\"" + fileName + ".xls\"";  //"名单.xls"             else                  outputFileName = HttpUtility.UrlEncode(fileName);            HttpResponse Response = HttpContext.Current.Response;            Response.ClearContent();            Response.AddHeader("content-disposition", "attachment; filename=" + outputFileName + ".xls");            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");            Response.Charset = "gb2312";            Response.ContentType = "application/ms-excel";            string tab = "";            foreach (DataColumn dc in dt.Columns)            {                HttpContext.Current.Response.Write(tab + dc.ColumnName);                tab = "\t";            }            HttpContext.Current.Response.Write("\n");            int i;            foreach (DataRow dr in dt.Rows)            {                tab = "";                for (i = 0; i < dt.Columns.Count; i++)                {                    HttpContext.Current.Response.Write(tab + dr[i].ToString());                    tab = "\t";                }                HttpContext.Current.Response.Write("\n");            }            HttpContext.Current.Response.End();        }