直接贴上代码，里面都有注释
/// xml格式生成excel文件并存盘;
/// </summary>
/// <param name="page">生成报表的页面，没有传null</param>
/// <param name="dt">数据表</param>
/// <param name="TableTitle">报表标题，sheet1名</param>
/// <param name="fileName">存盘文件名，全路径</param>
/// <param name="IsDown">生成文件后是否提示下载,只有web下才有效</param>
public static void CreateExcelByXml(System.Web.UI.Page page, DataTable dt, String TableTitle, string fileName, bool IsDown)
{
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=\"");
strb.Append(" <head> <meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>");
strb.Append(" <style>");
strb.Append("body");
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("table");
//strb.Append(" {border-collapse:collapse;margin:1em 0;line-height:20px;font-size:12px;color:#222; margin:0px;}");
strb.Append(" {border-collapse:collapse;margin:1em 0;line-height:20px;color:#222; margin:0px;}");
strb.Append("thead tr td");
strb.Append(" {background-color:#e3e6ea;color:#6e6e6e;text-align:center;font-size:14px;}");
strb.Append("tbody tr td");
strb.Append(" {font-size:12px;color:#666;}");
strb.Append(" </style>");
strb.Append(" <xml>");
strb.Append(" <x:ExcelWorkbook>");
strb.Append(" <x:ExcelWorksheets>");
strb.Append(" <x:ExcelWorksheet>");
//设置工作表 sheet1的名称
strb.Append(" <x:Name>" + TableTitle + " </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>");
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> ");
strb.Append(" <table style=\"border-right: 1px solid #CCC;border-bottom: 1px solid #CCC;text-align:center;\"> <thead><tr>");
//合格所有列并显示标题
strb.Append(" <td style=\"text-align:center;background:#d3eeee;font-size:18px;\" colspan=\"" + dt.Columns.Count + "\" ><b>");
strb.Append(TableTitle);
strb.Append(" </b></td> ");
strb.Append(" </tr>");
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