“XSI”是使用XmlDocument的未声明的前缀 [英] 'xsi' is an undeclared prefix using XmlDocument
问题描述
我收到XSI是使用XmlDocument的未声明的前缀
I am receiving 'xsi' is an undeclared prefix using XmlDocument.
我想读它具有以下模式的文件:
I am trying to read a file which has the following schema:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2"
xmlns:gx="http://www.google.com/kml/ext/2.2"
xmlns:kml="http://www.opengis.net/kml/2.2"
xmlns:atom="http://www.w3.org/2005/Atom">
<Document>
<Document id="robert" xsi:schemaLocation="http://www.opengis.net/kml/2.2 http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd http://www.google.com/kml/ext/2.2 http://code.google.com/apis/kml/schema/kml22gx.xsd">
<Placemark>
<description>test</description>
</Placemark>
</Document>
</Document>
</kml>
我曾尝试以下内容:
I have tried the following:
XmlDocument xmldoc = new XmlDocument();
using (XmlTextReader tr = new XmlTextReader(strXmlFile))
{
//tr.Namespaces = false; (uncomment to ignore namespace)
xmldoc.Load(tr); // 'xsi' is an undeclared prefix error here
}
如果我取消注释行忽略命名空间,它加载确定,但未能挽救的XmlDocument
以后。因此忽略它不会是一个解决方案。有谁知道如何正确地加载架构?问题/错误似乎是在此节点:
If I uncomment the line to ignore the namespace, it loads ok but fails to save the XmlDocument
later on. So ignoring it would not be a solution. Does anyone know how to properly load the schema? The issue/error appears to be in this node:
<Document id="robert" xsi:schemaLocation="http://www.opengis.net/kml/2.2 http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd http://www.google.com/kml/ext/2.2 http://code.google.com/apis/kml/schema/kml22gx.xsd">
更新#1
我试过如下:
Update #1 I tried the following:
XmlDocument xmldoc = new XmlDocument();
NameTable nt = new NameTable();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
nsmgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
XmlParserContext context = new XmlParserContext(null, nsmgr, null, XmlSpace.None);
XmlReaderSettings xset = new XmlReaderSettings();
xset.ConformanceLevel = ConformanceLevel.Fragment;
XmlReader rd = XmlReader.Create(new StringReader(strXmlFile), xset, context);
xmldoc.Load(rd); // error is still on this line
但我收到此错误现在:
But am receiving this error now:
指定的节点不能被插入作为该节点的有效子,因为指定的节点是错误的类型。它看起来像我越来越近了......
"The specified node cannot be inserted as the valid child of this node, because the specified node is the wrong type." It looks like I am getting closer...
推荐答案
解决方案:
我是能够解决的问题!下面是最终的代码:
I was able to solve the problem! Here is the final code:
XmlDocument xmldoc = new XmlDocument();
XmlReaderSettings settings = new XmlReaderSettings { NameTable = new NameTable() };
XmlNamespaceManager xmlns = new XmlNamespaceManager(settings.NameTable);
xmlns.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
XmlParserContext context = new XmlParserContext(null, xmlns, "", XmlSpace.Default);
XmlReader reader = XmlReader.Create(strXmlFile, settings, context);
xmldoc.Load(reader);
另外一个技巧,通过这些节点进行搜索时,记得要设置正确的命名空间,例如,搜索地标之上,这将是格式为:
Also one more tip, when searching through the nodes, remember to set the correct namespace, for example to search for Placemark above, this would be the format:
// Setup default namespace manager for searching through nodes
XmlNamespaceManager manager = new XmlNamespaceManager(xmldoc.NameTable);
string defaultns = xmldoc.DocumentElement.GetNamespaceOfPrefix("");
manager.AddNamespace("ns", defaultns);
// get a list of all <Placemark> nodes
XmlNodeList listOfPlacemark = xmldoc.SelectNodes("//ns:Placemark", manager);
// iterate over the <Placemark> nodes
foreach (XmlNode singlePlaceMark in listOfPlacemark)
// Get the description subnode
XmlNode descriptionNode = singlePlaceMark.SelectSingleNode("ns:description", manager);
..
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