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DataTable数据表导出Excel (传统方法)

 1 protected void CreateExcel(DataTable dt, string fileName)
 2     {
 3         System.Text.StringBuilder strb = new System.Text.StringBuilder();
 4         strb.Append(" <html xmlns:o=\"urn:schemas-microsoft-com:office:office\"");
 5         strb.Append("xmlns:x=\"urn:schemas-microsoft-com:office:excel\"");
 6         strb.Append("xmlns=\"http://www.w3.org/TR/REC-html40\">");
 7         strb.Append(" <head> <meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>");
 8         strb.Append(" <style>");
 9         strb.Append(".xl26");
10         strb.Append(" {mso-style-parent:style0;");
11         strb.Append(" font-family:\"Times New Roman\", serif;");
12         strb.Append(" mso-font-charset:0;");
13         strb.Append(" mso-number-format:\"@\";}");
14         strb.Append(" </style>");
15         strb.Append(" <xml>");
16         strb.Append(" <x:ExcelWorkbook>");
17         strb.Append(" <x:ExcelWorksheets>");
18         strb.Append(" <x:ExcelWorksheet>");
19         strb.Append(" <x:Name>ResourceDetails</x:Name>");
20         strb.Append(" <x:WorksheetOptions>");
21         strb.Append(" <x:DefaultRowHeight>285</x:DefaultRowHeight>");
22         strb.Append(" <x:Selected/>");
23         strb.Append(" <x:Panes>");
24         strb.Append(" <x:Pane>");
25         strb.Append(" <x:Number>3</x:Number>");
26         strb.Append(" <x:ActiveCol>1</x:ActiveCol>");
27         strb.Append(" </x:Pane>");
28         strb.Append(" </x:Panes>");
29         strb.Append(" <x:ProtectContents>False</x:ProtectContents>");
30         strb.Append(" <x:ProtectObjects>False</x:ProtectObjects>");
31         strb.Append(" <x:ProtectScenarios>False</x:ProtectScenarios>");
32         strb.Append(" </x:WorksheetOptions>");
33         strb.Append(" </x:ExcelWorksheet>");
34         strb.Append(" <x:WindowHeight>6750</x:WindowHeight>");
35         strb.Append(" <x:WindowWidth>10620</x:WindowWidth>");
36         strb.Append(" <x:WindowTopX>480</x:WindowTopX>");
37         strb.Append(" <x:WindowTopY>75</x:WindowTopY>");
38         strb.Append(" <x:ProtectStructure>False</x:ProtectStructure>");
39         strb.Append(" <x:ProtectWindows>False</x:ProtectWindows>");
40         strb.Append(" </x:ExcelWorkbook>");
41         strb.Append(" </xml>");
42         strb.Append("");
43         strb.Append(" </head> <body> <table align=\"center\" style='border-collapse:collapse;table-layout:fixed'> <tr>");
44         if (dt.Rows.Count > 0)
45         {
46             //写列标题   
47             int columncount = dt.Columns.Count;
48             for (int columi = 0; columi < columncount; columi++)
49             {
50                 strb.Append(" <td style='text-align:center;'><b>" + dt.Columns[columi] + "</b></td>");
51             }
52             strb.Append(" </tr>");
53             //写数据   
54             for (int i = 0; i < dt.Rows.Count; i++)
55             {
56                 strb.Append(" <tr>");
57                 for (int j = 0; j < dt.Columns.Count; j++)
58                 {
59                     if (dt.Columns[j].DataType == Type.GetType("System.Decimal"))
60                     {
61                         strb.Append(" <td class='xl26' style='text-align:right;'>" + dt.Rows[i][j].ToString() + "</td>");
62                     }
63                     else
64                     {
65                         strb.Append(" <td class='xl26'>" + dt.Rows[i][j].ToString() + "</td>");
66                     }
67                 }
68                 strb.Append(" </tr>");
69             }
70         }
71         strb.Append("</table> </body> </html>");
72         Response.Clear();
73         Response.Buffer = true;
74         Response.Charset = "UTF-8";
75         Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) + ".xls");
76         Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");//设置输出流   
77         Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。   
78         this.EnableViewState = false;
79         Response.Write(strb);
80         Response.End();
81     }

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原文地址：https://www.cnblogs.com/52life/p/520life.html