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[英]How to read/write nodes and child nodes from xml file in c# maybe using xpath?
[英]How do I extract child nodes from XML file using XPath when both child nodes must exist?
我正在尝试从xml文档中提取某些值。 在下面的示例中,我想将存储在“ c”和“ d”节点中的值存储在列表中,但仅在“ b”节点同时包含“ c”和“ d”的情况下。 到目前为止,我拥有的代码循环遍历所有“ b”节点,但是我不确定在while循环中放入什么,或者这是否是最佳方法。
XmlDocument attrsXML = new XmlDocument();
attrsXML.LoadXml(dbReader["SampleXml"].ToString());
XPathNavigator nav = attrsXML.CreateNavigator();
XPathNodeIterator attribNodes = nav.Select("/a/b");
while (attribNodes.MoveNext())
{
// What do I need to put here in order to extract the 'c' and 'd' nodes?
// Any other nodes can be ignored (such as 'e' above). I am only interested
// when 'b' contains both 'c' AND 'd'.
}
从数据库加载的“ SampleXml”在哪里:
<a>
<b>
<c>Extract this</c>
<d>And this</d>
<e>not this</e>
</b>
<b>
<c>not this</c>
<e>not this</e>
</b>
<b>
<c>Extract this</c>
<d>And this</d>
</b>
</a>
任何帮助表示赞赏。
您可以使用以下代码:
XmlDocument attrsXML = new XmlDocument();
attrsXML.LoadXml(dbReader["SampleXml"].ToString());
XmlNodeList nodeList = attrsXML.SelectNodes("/a/b[c and d]");
foreach (XmlNode xmlNode in nodeList)
{
string cText = xmlNode.SelectSingleNode("c").InnerText;
string dText = xmlNode.SelectSingleNode("d").InnerText;
}
XPath“ / a / b [c和d]”返回所有包含c和d元素的b个元素作为子元素,这意味着您不需要在循环内手动检查它。
我是这样解决的:
while (attribNodes.MoveNext())
{
string cText = String.Empty;
string dText = String.Empty;
XPathNavigator nav2 = attribNodes.Current;
var cNode = nav2.SelectSingleNode("c");
if (cNode != null)
{
cText = nameNode.ToString();
var dNode = nav2.SelectSingleNode("d");
if (dNode != null)
{
dText = dNode.ToString();
}
}
if (dText != String.Empty && cText != String.Empty)
{
// Problem solved
}
}
欢迎任何更好的解决方案,因为它看起来不太优雅。
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