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23.8.1 将ADO.NET数据转换为XML文档(1)
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23.8.1 将ADO.NET数据转换为XML文档(1)
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<div style='float:left;width:49%'>·<a href='100165645.htm'>23.7.1 System.Xml.XPath命名空间</a></div><div style='float:right;width:49%'>·<a href='100165646.htm'>23.7.2 System.Xml.Xsl命名空间</a></div><div style='float:left;width:49%'>·<a href='100165647.htm'>23.8 XML和ADO.NET</a></div><div style='float:right;width:49%'>·<a href='100165649.htm'>23.8.1 将ADO.NET数据转换为XML文档(2)</a></div><div style='float:left;width:49%'>·<a href='100165650.htm'>23.8.2 把XML文档转换为 ADO.NET数据</a></div><div style='float:right;width:49%'>·<a href='100165651.htm'>23.8.3 读写DiffGram</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-US">23.8.1 </span><span style="FONT-FAMILY: 黑体">将</span><span lang="EN-US">ADO.NET</span><span style="FONT-FAMILY: 黑体">数据转换为</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 黑体">文档</span></h3>
<p class="MsoNormal"><a ftel="ADOdata"><span style="FONT-FAMILY: 宋体">下面要介绍的第一个示例使用</span><span lang="EN-US">ADO.NET</span></a><span style="FONT-FAMILY: 宋体">、流和</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">把</span><span lang="EN-US">Northwind</span><span style="FONT-FAMILY: 宋体">数据库中的一些数据推入</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">，并从</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中加载带有</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">XmlDocument</span><span style="FONT-FAMILY: 宋体">对象，把</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">加载到列表框中。为了运行下面几个示例，需要添加如下</span><span lang="EN-US">using</span><span style="FONT-FAMILY: 宋体">语句：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><a ftel="OLE_LINK30"><span lang="EN-US">using System.Data;</span></a></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Xml;</span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Data.SqlClient;</span></p>
<p class="a6" style="MARGIN-TOP: 0cm; BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">using System.IO;</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">因为要使用</span><span lang="EN-US">XmlDocument</span><span style="FONT-FAMILY: 宋体">，所以还需要在模块级添加如下代码：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">private XmlDocument doc = new XmlDocument();</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">对于</span><span lang="EN-US">ADO.NET</span><span style="FONT-FAMILY: 宋体">示例，在窗体上添加一个</span><span lang="EN-US">DataGrid</span><span style="FONT-FAMILY: 宋体">，这样就可以在</span><span lang="EN-US">ADO.NET DataSet</span><span style="FONT-FAMILY: 宋体">中查看数据了，因为数据被绑定到网格上。还可以查看生成的</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档中的数据，这些数据加载到了列表框中。下面是第一个示例的代码，它们在</span><span lang="EN-US">ADOSample1</span><span style="FONT-FAMILY: 宋体">文件夹中：</span></p>
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