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21.8.2 写入XML输出结果
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<div style='float:left;width:49%'>·<a href='100165611.htm'>21.7.2 从XML中给数据集填充数据</a></div><div style='float:right;width:49%'>·<a href='100165612.htm'>21.8 保存对数据集的修改</a></div><div style='float:left;width:49%'>·<a href='100165613.htm'>21.8.1 通过数据适配器进行更新</a></div><div style='float:right;width:49%'>·<a href='100165615.htm'>21.9 使用ADO.NET</a></div><div style='float:left;width:49%'>·<a href='100165616.htm'>21.9.1 分层开发</a></div><div style='float:right;width:49%'>·<a href='100165617.htm'>21.9.2 SQL Server的键生成</a></div></div>
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><span lang="EN-GB">21.8.2 </span><span style="FONT-FAMILY: 黑体">写入</span><span lang="EN-GB">XML</span><span style="FONT-FAMILY: 黑体">输出结果</span></h3>
<p class="MsoNormal"><a ftel="XML2"><span style="FONT-FAMILY: 宋体">如上所述，</span><span lang="EN-US">DataSet</span></a><span style="FONT-FAMILY: 宋体">支持在</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">中定义其模式。可以从</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档中读取数据，也可以把数据写入</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档。</span></p>
<p class="MsoNormal"><span lang="EN-US">DataSet.WriteXml</span><span style="FONT-FAMILY: 宋体">方法可以输出存储在</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中的各种数据，可以选择只输出数据，也可以输出数据和模式。下面是为上述</span><span lang="EN-US">Region</span><span style="FONT-FAMILY: 宋体">示例编写的代码：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-GB">ds.WriteXml(".\\WithoutSchema.xml");</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-GB">ds.WriteXml(".\\WithSchema.xml" , XmlWriteMode.WriteSchema);</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">第一个文件</span><span lang="EN-US">WithoutSchema.xml</span><span style="FONT-FAMILY: 宋体">如下所示：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"><?xml version="1.0" standalone="yes"?></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"><NewDataSet></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionID>1</RegionID></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionDescription>Eastern </RegionDescription></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> </Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionID>2</RegionID></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionDescription>Western </RegionDescription></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> </Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionID>3</RegionID></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionDescription>Northern </RegionDescription></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> </Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <Region></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionID>4</RegionID></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> <RegionDescription>Southern </RegionDescription></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-GB"> </Region></span></p>
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