I'm trying to get a node from an XML string in C# using SelectSingleNode. The XML string comes from an external source.
string logonXML = #"<attrs xmlns=""http://www.sap.com/rws/bip\"">
<attr name=""userName"" type=""string""></attr>
<attr name=""password"" type=""string""></attr>
<attr name=""auth"" type=""string"" possibilities=""secEnterprise,secLDAP,secWinAD,secSAPR3"">secEnterprise</attr>
</attrs>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(logonXML);
XmlNode root = doc.DocumentElement;
XmlNode usernameXML = root.SelectSingleNode("//attr[#name='userName']");
Debug.WriteLine(usernameXML.OuterXml);
However usernameXML is null. I've tried using both the doc and root with a couple variations of XPath queries, but can't seem to find the node. What is wrong with this XPath? Or am I using the library wrong?
You need to take into account the XML namespace that's defined on your root node!
Try something like this:
string logonXML = #"<attrs xmlns=""http://www.sap.com/rws/bip"">
<attr name=""userName"" type=""string""></attr>
<attr name=""password"" type=""string""></attr>
<attr name=""auth"" type=""string"" possibilities=""secEnterprise,secLDAP,secWinAD,secSAPR3"">secEnterprise</attr>
</attrs>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(logonXML);
// define the XML namespace(s) that's in play here
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("ns", "http://www.sap.com/rws/bip");
// select including the XML namespace manager
XmlNode usernameXML = doc.SelectSingleNode("/ns:attrs/ns:attr[#name='userName']", nsmgr);
string test = usernameXML.InnerText;
Related
In C# I'm struggling to understand how to query XML using XPath that includes a namespace.
XML:
<?xml version="1.0" encoding="utf-8"?>
<SomeEntity xmlns="http://www.example.com/Schemas/SomeEntity/2023/01">
<Child>
<TextValue>Some text</TextValue>
</Child>
</SomeEntity>
XPath:
/SomeEntity[#xmlns="http://www.example.com/Schemas/SomeEntity/2023/01"]/Child/TextValue
C#:
XmlNodeList nodes = doc.SelectNodes(xpath); \\ doc being of type XmlDocument
SelectNodes always results in an empty XmlNodeList.
What's the best way in C# to resolve XPath queries that include a namespace in this way?
I get the same result when using XDocument:
var doc = XDocument.Parse(xml);
string xpath = #"/SomeEntity[#xmlns=""http://www.example.com/Schemas/SomeEntity/2023/01""]/Child/TextValue";
var results = doc.XPathSelectElements(xpath);
It is better to use LINQ to XML.
There is no need to hardcode the default namespace. The GetDefaultNamespace() call gets it for you.
c#
void Main()
{
XDocument xdoc = XDocument.Parse(#"<SomeEntity xmlns='http://www.example.com/Schemas/SomeEntity/2023/01'>
<Child>
<TextValue>Some text</TextValue>
</Child>
</SomeEntity>");
XNamespace ns = xdoc.Root.GetDefaultNamespace();
string TextValue = xdoc.Descendants(ns + "TextValue")?.FirstOrDefault().Value;
Console.WriteLine("TextValue='{0}'", TextValue);
}
Output
TextValue='Some text'
For querying with the xmlns attibute condition, with #xmlns is not working. Instead, you need namespace-uri().
Pre-requisites:
Must add the XML namespace for query.
Provide the namespace prefix in the query.
For XmlDocument
string xpath = #"//se:SomeEntity[namespace-uri()='http://www.example.com/Schemas/SomeEntity/2023/01']/se:Child/se:TextValue";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
var mgr = new XmlNamespaceManager(doc.NameTable);
mgr.AddNamespace("se", "http://www.example.com/Schemas/SomeEntity/2023/01");
var nodes = doc.DocumentElement.SelectNodes(xpath, mgr);
Console.WriteLine(nodes.Count);
Console.WriteLine(nodes.Item(0).FirstChild.Value);
For XDocument
using System.Linq;
using System.Xml.XPath;
using System.Xml.Linq;
string xpath = #"//se:SomeEntity[namespace-uri()='http://www.example.com/Schemas/SomeEntity/2023/01']/se:Child/se:TextValue";
var xDoc = XDocument.Parse(xml);
var mgr = new XmlNamespaceManager(doc.NameTable);
mgr.AddNamespace("se", "http://www.example.com/Schemas/SomeEntity/2023/01");
var results = xDoc.XPathSelectElements(xpath, mgr);
Console.WriteLine(results.FirstOrDefault()?.Value);
I am trying to get a node in a simple XML, but no matter what I try I always get null.
I am guessing that the issue is the namespace.
I am simply trying to get the value of the ID element, 331377697.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("E:\\0323.xml");
XmlNamespaceManager manager = new XmlNamespaceManager(xmlDoc.NameTable);
manager.AddNamespace("cac", "http://xxxxxx Some URL XXXX");
manager.AddNamespace("cbc", "http://xxxxxx Some URL XXXX");
string query = "/StandardBusinessDocument/Invoice/cbc:ID";
XmlNode xmlNode = xmlDoc.SelectSingleNode(query, manager);
The XML:
<StandardBusinessDocument xmlns="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader">
<StandardBusinessDocumentHeader>
...
</StandardBusinessDocumentHeader>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" xmlns:ccts="urn:un:unece:uncefact:documentation:2"
...
</Invoice>
<cbc:UBLVersionID>2.1</cbc:UBLVersionID>
<cbc:CustomizationID>1234</cbc:CustomizationID>
<cbc:ProfileID>1234564</cbc:ProfileID>
<cbc:ID>331377697</cbc:ID>
<cbc:IssueDate>2017-03-23</cbc:IssueDate>
<cbc:InvoiceTypeCode listID="UNCL1001">380</cbc:InvoiceTypeCode>
<cbc:DocumentCurrencyCode listID="ISO4217">NOK</cbc:DocumentCurrencyCode>
<cac:OrderReference>
<cbc:ID>146136</cbc:ID>
</cac:OrderReference>
...
You must specify the exact namespaces.
Also you have to specify namespace prefixes for all elements in the XPath.
manager.AddNamespace("nsDoc", "http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader");
manager.AddNamespace("nsInvoice", "urn:oasis:names:specification:ubl:schema:xsd:Invoice-2");
manager.AddNamespace("cbc", "urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2");
string query = "/nsDoc:StandardBusinessDocument/nsInvoice:Invoice/cbc:ID";
It's supposed to work.
I would like to read a XML File with C#, but i always get an error.
This is my XML
<?xml version="1.0" encoding="ISO-8859-1"?>
<OMDS xmlns="urn:omds20" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:omds20 ./omds26-00.xsd">
<PAKET VUNr="014" PaketZpktErstell="2014-08-29T10:45:08.575" PaketZpktLetztErstell="2014-08-29T10:45:08.575" PaketInhCd="VM" PaketUmfCd="G" VUVersion="26-00" DVRNrAbs="0">
<PERSON ....
<PERSON ....
<PERSON ....
I would like to read this XML, but XMLContentNodes is always null. So i am unable to get the SelectSingleNode with this Path, but i cant find out what should be wrong here?
XmlDocument doc = new XmlDocument();
doc.Load(openFileDialog1.FileName);
XmlNode XMLContentNodes = doc.SelectSingleNode("/OMDS/PAKET"); // Error Here
XmlNodeList PersonNodeList = XMLContentNodes.SelectNodes("PERSON");
foreach (XmlNode node in PersonNodeList)
{
.....
Any help would be greatly appreciated.
The usual namespace problem. Try
XmlNamespaceManager mgr = new XmlNamespaceManager(new NameTable());
mgr.AddNamespace("d", "urn:omds20");
XmlNode XMLContentNodes = doc.SelectSingleNode("/d:OMDS/d:PAKET", mgr);
XmlNodeList PersonNodeList = XMLContentNodes.SelectNodes("d:PERSON", mgr);
You'll need to add the namespace urn:omds20 to the doc XmlDocument object after loading your XML file in it. It will look like the following:
XmlDocument doc = new XmlDocument();
doc.Load(openFileDialog1.FileName);
XmlNamespaceManager xmlnsManager = new XmlNamespaceManager(doc.NameTable);
xmlnsManager.AddNamespace("omds20", "urn:omds20");
Then you can query for the PAKET node like this:
XmlNode paketNode = doc.SelectSingleNode("/omds20:OMDS/omds20:PAKET", xmlnsManager);
Using C#2.0 and VIsualStudio2005
I'm trying to access the "DisplayName" inside "MonitorResponseRecord"
from an XML file like the one Below:
<Magellan xsi:schemaLocation="http://tempuri.org/XMLSchema.xsd ..\Schema\Configuration.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://tempuri.org/XMLSchema.xsd">
<SchemaVersion>1.0</SchemaVersion>
<MonitorScope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" id="CleanStationChemicalManifoldFeed5" xmlns="http://tempuri.org/XMLSchema.xsd">
<PersonalSafety>
<MonitorResponseRecord Enabled="true" DisplayName="ChemicalManifoldFeed5ControllerFault">
<ExpressionMonitor>
<Expression>(ChemicalManifold.Feed5.DispenseValve = Open) and ((ChemicalManifold.Feed5.ViolatedRegion = HighProcess) or (ChemicalManifold.Feed5.ViolatedRegion = LowProcess) or (ChemicalManifold.Feed5.ViolatedRegion = Minimum))</Expression>
<TestInterval>0.1</TestInterval>
<MinimumTimeBetweenResponses>5</MinimumTimeBetweenResponses>
</ExpressionMonitor>
<Response>
<PostAlarm>
<AlarmName>ChemicalManifold_Feed5_ControllerFault</AlarmName>
<Parameter1 />
<Parameter2>Alarm Region = {ChemicalManifold.Feed5.ViolatedRegion}</Parameter2>
<Parameter3>{RecipeName}-{StepName}</Parameter3>
<Parameter4>FlowSetpoint = {ChemicalManifold.Feed5.Setpoint}-LPM, ActualFlow = {ChemicalManifold.Feed5.FlowMeter}-LPM</Parameter4>
</PostAlarm>
<ResponseEvent>
<TargetResource />
<Event>PA</Event>
<Reason>ChemicalSupply</Reason>
</ResponseEvent>
</Response>
</MonitorResponseRecord>
</PersonalSafety>
<PersonalSafety>
<MonitorResponseRecord Enabled="true" DisplayName = "PressureValveFailure">
...
...
...and soon
My current C# attempt is as follows, BUT it always hangs up when I try to XmlDocument.Load("");
XmlDocument doc = new XmlDocument();
doc.Load("../UMC0009.Configuration.Root.xml");
string attrVal = doc.SelectSingleNode("MonitorResponseRecord/#DisplayName").Value;
BUUUUT won't work :/ any help out there?
UPDATE:
the exception I recieve is as follows, and occures at the doc.Load("...") line:
{"Namespace Manager or XsltContext needed. This query has a prefix, variable, or user-defined function."} System.Exception {System.Xml.XPath.XPathException}
Your XPath query will be relative to the document root:
doc.SelectSingleNode("MonitorResponseRecord/#DisplayName")
To make it search anywhere in the doc prefix it with double slash:
doc.SelectSingleNode("//MonitorResponseRecord/#DisplayName")
If that still doesn't work I would try the above example after stripping out all those namespace declarations on the two root nodes.
Otherwise, with the namespace declarations you may find you need to define XML namespace mappings and use prefixes in your XPath like:
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("x", "http://tempuri.org/XMLSchema.xsd");
doc.SelectSingleNode("//x:MonitorResponseRecord/#DisplayName")
What about:
XmlDocument doc = new XmlDocument();
doc.Load("UMC0009.Configuration.Root.xml");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("ns", "http://tempuri.org/XMLSchema.xsd");
string attrVal = doc.SelectSingleNode("//ns:MonitorResponseRecord/#DisplayName", nsmgr).Value;
Using a namespace manager, specify your namespace URI and use it in your XPath.
It works for me.
The problem is the ServiceDocument as the xmlns attribute on it.
---Preassigned XML
System.Xml.XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml("<?xml version=\"1.0\" encoding=\"utf-8\"?>
<ServiceDocument
xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"
xmlns=\"http://schemas.microsoft.com/ado/2007/08/dataservices\"
>
<BaseUri>
http://xxxx.xxxxx.net/xxx.1/
</BaseUri>
<ProfilesLink>
http://adf.apis.dds.net/af.1/
</ProfilesLink>
<SignedInUser>
<Cid>
4433sfsdfgd
</Cid>
<Uri>
http://fd.apis.afdafd.net/V4.1/cid-xxxxx/adad
</Uri>
</SignedInUser>
<StatusMessageLink>
http://psm.adfa.afd.net/dfa.1/
</StatusMessageLink>
</ServiceDocument>"
);
// Response.Write(xmlDoc.InnerXml);
--//PARSE XML problem is below**
Response.Write(xmlDoc.SelectSingleNode("/ServiceDocument/BaseUri").InnerXml);
You need to assign short aliases to the namespaces using the XMLNamespaceManager.
See this page for an example.
So, to solve your problem:
var xmlNamespaceManager = new XmlNamespaceManager(xmlDoc.NameTable);
xmlNamespaceManager.AddNamespace("ds", "http://schemas.microsoft.com/ado/2007/08/dataservices");
var result = xmlDoc.SelectNodes("/ds:ServiceDocument/ds:BaseUri", xmlNamespaceManager);