导出EXCEL

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来源：http://www.cnblogs.com/usea/archive/2008/09/19/1294279.html
这种导出方式可以解决导出格式问题

例如：其他很多方法导出18位身份证到EXCEL的时候会自动变为科学计数法，并且会丢失最后3位数字

而这种方法则解决了这个问题

protected void CreateExcel(DataTable dt,string fileName)     {
        StringBuilder strb = new StringBuilder();
        strb.Append(" <html xmlns:o=\"urn:schemas-microsoft-com:office:office\"");
        strb.Append("xmlns:x=\"urn:schemas-microsoft-com:office:excel\"");
        strb.Append("xmlns=\"http://www.w3.org/TR/REC-html40\"");
        strb.Append(" <head> <meta http-equiv='Content-Type' content='text/html; charset=gb2312'>");
        strb.Append(" <style>");
        strb.Append(".xl26");
        strb.Append(" {mso-style-parent:style0;");
        strb.Append(" font-family:\"Times New Roman\", serif;");
        strb.Append(" mso-font-charset:0;");
        strb.Append(" mso-number-format:\"@\";}");
        strb.Append(" </style>");
        strb.Append(" <xml>");
        strb.Append(" <x:ExcelWorkbook>");
        strb.Append(" <x:ExcelWorksheets>");
        strb.Append(" <x:ExcelWorksheet>");
        strb.Append(" <x:Name>Sheet1 </x:Name>");
        strb.Append(" <x:WorksheetOptions>");
        strb.Append(" <x:DefaultRowHeight>285 </x:DefaultRowHeight>");
        strb.Append(" <x:Selected/>");
        strb.Append(" <x:Panes>");
        strb.Append(" <x:Pane>");
        strb.Append(" <x:Number>3 </x:Number>");
        strb.Append(" <x:ActiveCol>1 </x:ActiveCol>");
        strb.Append(" </x:Pane>");
        strb.Append(" </x:Panes>");
        ////设置工作表只读属性
        //strb.Append(" <x:ProtectContents>False </x:ProtectContents>");
        //strb.Append(" <x:ProtectObjects>False </x:ProtectObjects>");
        //strb.Append(" <x:ProtectScenarios>False </x:ProtectScenarios>");
        strb.Append(" </x:WorksheetOptions>");
        strb.Append(" </x:ExcelWorksheet>");
        strb.Append(" <x:WindowHeight>6750 </x:WindowHeight>");
        strb.Append(" <x:WindowWidth>10620 </x:WindowWidth>");
        strb.Append(" <x:WindowTopX>480 </x:WindowTopX>");
        strb.Append(" <x:WindowTopY>75 </x:WindowTopY>");
        strb.Append(" <x:ProtectStructure>False </x:ProtectStructure>");
        strb.Append(" <x:ProtectWindows>False </x:ProtectWindows>");
        strb.Append(" </x:ExcelWorkbook>");
        strb.Append(" </xml>");
        strb.Append("");
        strb.Append(" </head> <body> <table align=\"center\" style='border-collapse:collapse;table-layout:fixed'> <tr>");
        //if (ds.Tables.Count > 0)
        //{
            //写列标题
            int columncount = dt.Columns.Count;
            for (int columi = 0; columi < columncount; columi++)
            {
                strb.Append(" <td> <b>" + dt.Columns[columi] + " </b> </td>");
            }
            strb.Append(" </tr>");
                //写数据
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    strb.Append(" <tr>");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        strb.Append(" <td class='xl26'>" + dt.Rows[i][j].ToString() + " </td>");
                    }
                    strb.Append(" </tr>");
                }
        //}
        strb.Append(" </body> </html>");
        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "GB2312";
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
        Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。
        //this.EnableViewState = false;
        Response.Write(strb);
        Response.End();
    }