通过有效的 xpath 在 XmlDocument.SelectSingleNode 上为 Null return
Null return on XmlDocument.SelectSingleNode through valid xpath
我目前有以下代码
nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("soapenv", soapenv_namespace);
nsmgr.AddNamespace("de", de_namespace);
XmlNode xnEnvelope = xmlDoc.SelectSingleNode("//soapenv:Envelope", nsmgr);
XmlNode xnBody = xmlDoc.SelectSingleNode("//soapenv:Envelope/soapenv:Body", nsmgr);
XmlNode xnMessage = xnBody.SelectSingleNode("//soapenv:Envelope/soapenv:Body/message", nsmgr);
解析以下 xml(为了便于阅读而截断)
<?xml version="1.0" encoding="utf-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<message xmlns="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse" xmlns:ns2="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractReferenceResponse" xmlns:ns3="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractRequest" xmlns:ns4="http://www.origostandards.com/schema/tech/v1.0/SOAPFaultDetail">
<de:m_content .....
问题是线路
XmlNode xnMessage = xnBody.SelectSingleNode("//soapenv:Envelope/soapenv:Body/message", nsmgr); return 当我希望它成为 return 消息元素时,它为 null。
我高度怀疑它与我配置的空白命名空间有关,但我找不到正确的值组合来使其正常工作。
任何指点将不胜感激。
您在此处引入了默认命名空间 :
xmlns="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse"
这会导致 message
元素及其所有没有前缀的后代被识别为在该默认命名空间中(除非后代元素具有本地默认命名空间)。要访问默认命名空间中的元素,只需注册一个前缀,例如 d
,并将其映射到默认命名空间 uri :
nsmgr.AddNamespace("d", "http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse");
然后在XPath表达式中相应地使用新注册的前缀:
XmlNode xnBody = xmlDoc.SelectSingleNode("//soapenv:Envelope/soapenv:Body", nsmgr);
XmlNode xnMessage = xnBody.SelectSingleNode("d:message", nsmgr);
这是有效的
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"C:\Users\DummyUser\Desktop\Noname1.xml");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("soapenv", "http://schemas.xmlsoap.org/soap/envelope/");
nsmgr.AddNamespace("de", "http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse");
XmlNode xnEnvelope = xmlDoc.SelectSingleNode("//soapenv:Envelope", nsmgr);
XmlNode xnBody = xnEnvelope.SelectSingleNode("//soapenv:Body", nsmgr);
XmlNode xnMessage = xnBody.SelectSingleNode("de:message", nsmgr);
和 xml 文件是
<?xml version="1.0" encoding="utf-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<message xmlns="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse" xmlns:ns2="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractReferenceResponse"
xmlns:ns3="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractRequest"
xmlns:ns4="http://www.origostandards.com/schema/tech/v1.0/SOAPFaultDetail">
This is my sample message
</message>
</soapenv:Body>
</soapenv:Envelope>
我目前有以下代码
nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("soapenv", soapenv_namespace);
nsmgr.AddNamespace("de", de_namespace);
XmlNode xnEnvelope = xmlDoc.SelectSingleNode("//soapenv:Envelope", nsmgr);
XmlNode xnBody = xmlDoc.SelectSingleNode("//soapenv:Envelope/soapenv:Body", nsmgr);
XmlNode xnMessage = xnBody.SelectSingleNode("//soapenv:Envelope/soapenv:Body/message", nsmgr);
解析以下 xml(为了便于阅读而截断)
<?xml version="1.0" encoding="utf-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<message xmlns="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse" xmlns:ns2="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractReferenceResponse" xmlns:ns3="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractRequest" xmlns:ns4="http://www.origostandards.com/schema/tech/v1.0/SOAPFaultDetail">
<de:m_content .....
问题是线路 XmlNode xnMessage = xnBody.SelectSingleNode("//soapenv:Envelope/soapenv:Body/message", nsmgr); return 当我希望它成为 return 消息元素时,它为 null。
我高度怀疑它与我配置的空白命名空间有关,但我找不到正确的值组合来使其正常工作。
任何指点将不胜感激。
您在此处引入了默认命名空间 :
xmlns="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse"
这会导致 message
元素及其所有没有前缀的后代被识别为在该默认命名空间中(除非后代元素具有本地默认命名空间)。要访问默认命名空间中的元素,只需注册一个前缀,例如 d
,并将其映射到默认命名空间 uri :
nsmgr.AddNamespace("d", "http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse");
然后在XPath表达式中相应地使用新注册的前缀:
XmlNode xnBody = xmlDoc.SelectSingleNode("//soapenv:Envelope/soapenv:Body", nsmgr);
XmlNode xnMessage = xnBody.SelectSingleNode("d:message", nsmgr);
这是有效的
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"C:\Users\DummyUser\Desktop\Noname1.xml");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("soapenv", "http://schemas.xmlsoap.org/soap/envelope/");
nsmgr.AddNamespace("de", "http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse");
XmlNode xnEnvelope = xmlDoc.SelectSingleNode("//soapenv:Envelope", nsmgr);
XmlNode xnBody = xnEnvelope.SelectSingleNode("//soapenv:Body", nsmgr);
XmlNode xnMessage = xnBody.SelectSingleNode("de:message", nsmgr);
和 xml 文件是
<?xml version="1.0" encoding="utf-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<message xmlns="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractDetailResponse" xmlns:ns2="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractReferenceResponse"
xmlns:ns3="http://www.origostandards.com/schema/ce/v2.1/CEBondSingleContractRequest"
xmlns:ns4="http://www.origostandards.com/schema/tech/v1.0/SOAPFaultDetail">
This is my sample message
</message>
</soapenv:Body>
</soapenv:Envelope>