C#导出数据到Excel通用的方法类 | 导出数据到Excel通用的方法类

导出数据到Excel通用的方法类，请应对需求自行修改。
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using System.Data;

using System.IO;

namespace IM.Common.Tools

{

    public class Export

    {

        public string Encoding = "UTF-8";

        System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;

        public void EcportExcel(DataTable dt, string fileName)

        {

            if (dt != null)

            {

                StringWriter sw = new StringWriter();

                CreateStringWriter(dt, ref sw);

                sw.Close();

                response.Clear();

                response.Buffer = true;

                response.Charset = Encoding;

                //this.EnableViewState = false;

                response.AddHeader("Content-Disposition", "attachment; filename=" + fileName + ".xls");

                response.ContentType = "application/ms-excel";

                //response.ContentEncoding = System.Text.Encoding.GetEncoding(Encoding)

                response.ContentEncoding = System.Text.Encoding.UTF8;

                response.Write(sw);

                response.End();

            }

        }

        private void CreateStringWriter(DataTable dt, ref StringWriter sw)

        {

            string sheetName = "sheetName";

            sw.WriteLine("<html xmlns:x=\"urn:schemas-microsoft-com:office:excel\">");

            sw.WriteLine("<head>");

            sw.WriteLine("<!--[if gte mso 9]>");

            sw.WriteLine("<xml>");

            sw.WriteLine(" <x:ExcelWorkbook>");

            sw.WriteLine(" <x:ExcelWorksheets>");

            sw.WriteLine(" <x:ExcelWorksheet>");

            sw.WriteLine(" <x:Name>" + sheetName + "</x:Name>");

            sw.WriteLine(" <x:WorksheetOptions>");

            sw.WriteLine(" <x:Print>");

            sw.WriteLine(" <x:ValidPrinterInfo />");

            sw.WriteLine(" </x:Print>");

            sw.WriteLine(" </x:WorksheetOptions>");

            sw.WriteLine(" </x:ExcelWorksheet>");

            sw.WriteLine(" </x:ExcelWorksheets>");

            sw.WriteLine("</x:ExcelWorkbook>");

            sw.WriteLine("</xml>");

            sw.WriteLine("<![endif]-->");

            sw.WriteLine("</head>");

            sw.WriteLine("<body>");

            sw.WriteLine("<table>");

            sw.WriteLine(" <tr>");

            string[] columnArr = new string[dt.Columns.Count];

            int i = ;

            foreach (DataColumn columns in dt.Columns)

            {

                sw.WriteLine(" <td>" + columns.ColumnName + "</td>");

                columnArr[i] = columns.ColumnName;

                i++;

            }

            sw.WriteLine(" </tr>");

            foreach (DataRow dr in dt.Rows)

            {

                sw.WriteLine(" <tr>");

                foreach (string columnName in columnArr)

                {

                    sw.WriteLine(" <td style='vnd.ms-excel.numberformat:@'>" + dr[columnName] + "</td>");

                }

                sw.WriteLine(" </tr>");

            }

            sw.WriteLine("</table>");

            sw.WriteLine("</body>");

            sw.WriteLine("</html>");

        }

    }

}