前段时间做WEB项目时接到一个任务，报表都导出EXCEL。不能用第三方的报表工具，那只能操作EXCEL Library来解决了。
第一种：在服务端调用COM写EXCEL发关到客户端；这样不太可行因为系统的用户数量也很多,C#操作Excel(COM)效率不高，还很消耗服务器资源。
第二种:就是通过JSCRIPT来操作ActiveX,原理和第一种一样；只是操作数据操作放到客户端进行。
这两种方法操作和维护都很烦琐，而且效率也不高。
正在烦恼的时间突然想到了Excel到底能不能打开XML呢？试了一下发现是可以，然后在Excel画了一些表格另存为XML；打开后看了一下，笑了我可以通过动态生成XML不就可以啦。动态生成XML？就那些标记的组合就够烦，那会有直接操作COM来得方便直接？这里就要提一个工具了CodeSmith，它是一个基于模板的代码生成，模板的语法和ASP差不多，如果写过ASP一看就知道他的原理。这个工具在这里就不多介绍，有兴趣的朋友可以去了解一下。(当然还有其他代码生成工具，原理一样)
注意：Excel必须是XP或更高版本
HFSoft.Exports都是我自己封装的类
先来看下模NorthWind数据客户信息模板吧
==========================================
<%--
Name:
Author:
Description:
%>
<%@ CodeTemplate Language="C#" TargetLanguage="Text" Src="" Inherits="" Debug="False" Description="Template description here." %>
<%@ Assembly Name="System.Data" %>
<%@ Import Namespace="System.Data" %>
<%@ Assembly Name ="HFSoft.Exports" %>
<%@ Import Namespace="HFSoft.Exports"%>
<%@ Property Name="DataSource" Type="System.Data.DataSet" Optional="False" Category="Strings" Description="This is a sample string property." %>
<%
OnInit();
%>
<?xml version="1.0" encoding="GB2312"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:html="http://www.w3.org/TR/REC-html40">
<DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
<Author>HFSoft-Henry</Author>
<LastAuthor>HFSoft-Henry</LastAuthor>
<Created>2005-01-16T10:24:48Z</Created>
<Company>HFSoft</Company>
<Version>10.2625</Version>
</DocumentProperties>
<OfficeDocumentSettings xmlns="urn:schemas-microsoft-com:office:office">
<DownloadComponents/>
<LocationOfComponents HRef="file:///H:officeOfficeXPOfficeXP"/>
</OfficeDocumentSettings>
<ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
<WindowHeight>9450</WindowHeight>
<WindowWidth>12780</WindowWidth>
<WindowTopX>480</WindowTopX>
<WindowTopY>15</WindowTopY>
<ProtectStructure>False</ProtectStructure>
<ProtectWindows>False</ProtectWindows>
</ExcelWorkbook>
<Styles>
<Style ss:ID="Default" ss:Name="Normal">
<Alignment ss:Vertical="Center"/>
<Borders/>
<Font ss:FontName="宋体" x:CharSet="134" ss:Size="12"/>
<Interior/>
<NumberFormat/>
<Protection/>
</Style>
<Style ss:ID="m15730010">
<Alignment ss:Horizontal="Center" ss:Vertical="Center"/>
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="2"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="2"/>
<Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="2"/>
</Borders>
<Font ss:FontName="宋体" x:CharSet="134" ss:Size="14" ss:Color="#FFFFFF"
ss:Bold="1"/>
<Interior ss:Color="#008080" ss:Pattern="Solid"/>
</Style>
<Style ss:ID="m15730020">
<Alignment ss:Horizontal="Left" ss:Vertical="Center"/>
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="2"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"/>
</Borders>
</Style>
<Style ss:ID="m15730030">
<Alignment ss:Horizontal="Left" ss:Vertical="Center"/>
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"/>
</Borders>
</Style>
<Style ss:ID="m15741120">
<Alignment ss:Horizontal="Left" ss:Vertical="Center"/>
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"/>
</Borders>
</Style>
<Style ss:ID="m15741130">
<Alignment ss:Horizontal="Left" ss:Vertical="Center"/>
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="2"/>
<Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"/>
</Borders>
</Style>
<Style ss:ID="m15741140">
<Alignment ss:Horizontal="Left" ss:Vertical="Center"/>
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="2"/>
<Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"/>
</Borders>
</Style>
<Style ss:ID="s21">
<Font ss:FontName="宋体" x:CharSet="134" ss:Size="12" ss:Color="#FF0000"/>
</Style>
<Style ss:ID="s40">
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"/>
</Borders>
<Interior ss:Color="#C0C0C0" ss:Pattern="Solid"/>
</Style>
<Style ss:ID="s45">
<Borders>
<Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"/>
<Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="2"/>
<Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weig