string xml = #"<vehicle> <cars> <car>tet</car> </cars> </vehicle>";
XElement x = XElement.Parse(xml);
var node = x.XPathSelectElement("//vehicle/cars");
why is the node always null?
XPath should be
var node = x.XPathSelectElement("cars");
OUTPUT:
<cars>
<car>tet</car>
</cars>
Related
I have a XML file and loaded the specific tag <Acct> to an XElement. From this XElement in want to give a path to get the specific child <BIC> element. I don't wan't to use the Descendates() method. I tried using XPathSelectElement to get the job done but it always return null.
The XML Snippet i have looks something like this:
<Acct>
<Id>
<IBAN>TestIban</IBAN>
</Id>
<Ccy>EUR</Ccy>
<Svcr>
<FinInstnId>
<BIC>TestBic</BIC>
<ClrSysMmbId>
<ClrSysId>
<Cd>TestSysId</Cd>
</ClrSysId>
<MmbId>TestMemberId</MmbId>
</ClrSysMmbId>
<Nm>TestName</Nm>
<PstlAdr>
<AdrLine>TestAdrLine</AdrLine>
</PstlAdr>
<Othr>
<Id>OtherId</Id>
<Issr>Issr</Issr>
</Othr>
</FinInstnId>
</Svcr>
</Acct>
Like i said the XElement i have is the tag called acct. I tried now following to get the
<BIC> tag:
var bic = acct.XPathSelectElement("Svrc/FinInstnId/BIC");
var bic = acct.XPathSelectElement("/Svrc/FinInstnId/BIC");
var bic = acct.XPathSelectElement("./Svrc/FinInstnId/BIC");
var bic = acct.XPathSelectElement("Svrc//FinInstnId//BIC");
var bic = acct.XPathSelectElement("//Svrc//FinInstnId//BIC");
var bic = acct.XPathSelectElement(".//Svrc//FinInstnId//BIC");
var bic = acct.XPathSelectElement("Acct/Svrc/FinInstnId/BIC");
var bic = acct.XPathSelectElement("/Acct/Svrc/FinInstnId/BIC");
var bic = acct.XPathSelectElement("./Acct/Svrc/FinInstnId/BIC");
var bic = acct.XPathSelectElement("Acct//Svrc//FinInstnId//BIC");
var bic = acct.XPathSelectElement("//Acct//Svrc//FinInstnId//BIC");
var bic = acct.XPathSelectElement(".//Acct//Svrc//FinInstnId//BIC");
But all of these returning null. I found this article and they are doing in my point of view exactly the same:
https://codereview.stackexchange.com/questions/204464/get-a-xelement-at-a-given-path
SO my question is how do i use the XPathSelectElement method from my XElement to get a child like the tag as XElement?
Edit:
I inspected the XElement in Debug Mode with the Text Visualizer. The XML in the Element looks like the following (The values of the elements are different but this shouldn't change the problem):
<Acct xmlns="urn:iso:std:iso:20022:tech:xsd:camt.053.001.02">
<Id>
<IBAN>TestIban</IBAN>
</Id>
<Ccy>EUR</Ccy>
<Svcr>
<FinInstnId>
<BIC>TestBic</BIC>
<ClrSysMmbId>
<ClrSysId>
<Cd>Cd</Cd>
</ClrSysId>
<MmbId>TestMbmId</MmbId>
</ClrSysMmbId>
<Nm>SomeName</Nm>
<PstlAdr>
<AdrLine>Address</AdrLine>
</PstlAdr>
<Othr>
<Id>Id</Id>
<Issr>Issr</Issr>
</Othr>
</FinInstnId>
</Svcr>
</Acct>
Code works fine
var xmlString = #"<root>
<Acct>
<Id>
<IBAN>TestIban</IBAN>
</Id>
<Ccy>EUR</Ccy>
<Svcr>
<FinInstnId>
<BIC>TestBic</BIC>
<ClrSysMmbId>
<ClrSysId>
<Cd>TestSysId</Cd>
</ClrSysId>
<MmbId>TestMemberId</MmbId>
</ClrSysMmbId>
<Nm>TestName</Nm>
<PstlAdr>
<AdrLine>TestAdrLine</AdrLine>
</PstlAdr>
<Othr>
<Id>OtherId</Id>
<Issr>Issr</Issr>
</Othr>
</FinInstnId>
</Svcr>
</Acct>
</root>";
XDocument doc = XDocument.Parse(xmlString);
XElement acct = doc.XPathSelectElement("root/Acct");
XElement element = acct.XPathSelectElement("Svcr/FinInstnId/BIC");
Console.WriteLine(element.Value);
//print "TestBic"
are you sure acct contain right XElement?
update with namespace
XDocument doc = XDocument.Parse(xmlString);
var reader = doc.CreateReader();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(reader.NameTable);
nsmgr.AddNamespace("ns", "urn:iso:std:iso:20022:tech:xsd:camt.053.001.02");
XElement acct = doc.XPathSelectElement("//ns:Acct", nsmgr);
XElement element = acct.XPathSelectElement("*[local-name() = 'Svcr']/*[local-name() = 'FinInstnId']/*[local-name() = 'BIC']");
var anotherWay = acct.XPathSelectElement("ns:Svcr/ns:FinInstnId/ns:BIC", nsmgr);
with local-name() you can ignore namespace
Hi I try to read an xml file with LINQ.
The name of the file is:categorizedBooks.xml
and the content of the file looks like this:
<category name=".NET">
<books>
<book>CLR via C#</book>
<book>Essential .NET</book>
</books>
</category>
The code for reading the file looks like this:
XElement rootss = XElement.Load(#"D:/categorizedBooks.xml");
XElement dotNetCategoryss = rootss.Element("category");
XAttribute namehallo = dotNetCategoryss.Attribute("name");
XElement booksss = dotNetCategoryss.Element("books");
IEnumerable<XElement> bookElements = booksss.Elements("book");
Console.WriteLine((string)dotNetCategoryss);
foreach (XElement bookElement in bookElements)
{
Console.WriteLine(" - " + (string)bookElement);
}
But i get null on this line:
XAttribute namehallo = dotNetCategoryss.Attribute("name");
So how to fix this , so that it not will be null?
Thank you
Your doc root is the category element - try:
XAttribute namehallo = rootss.Attribute("name");
Console.WriteLine(namehallo.Value);
You'll have to change your other XElement references similarly
instead of XElement.Load use XDocument.Load or XDocument.Parse
var xml = #"
<category name='.NET'>
<books>
<book>CLR via C#</book>
<book>Essential .NET</book>
</books>
</category>";
var document = XDocument.Parse(xml);
// returns: .NET
var category = document
.Element("category")
.Attributes("name")
.Select(p => p.Value);
// returns: CLR via C#, Essential .NET
var books = document
.Descendants("book")
.Select(p => p.Value);
I try to parse this XML file (config file from Chirpy):
<?xml version="1.0" encoding="utf-8" ?>
<root xmlns="urn:ChirpyConfig"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:ChirpyConfig http://www.weirdlover.com/chirpy/chirp.xsd">
<FileGroup Name="Built.debug.js" Minify="false">
<File Path="jquery/jquery-1.7.2.js"/>
<File Path="jquery.address/jquery.address-1.4.js" />
</FileGroup>
</root>
with this code:
var path = Server.MapPath("~/Scripts/ScriptfilesMashup.chirp.config");
var file = new XPathDocument(path);
var nav = file.CreateNavigator();
var nodes = nav.Select("/root/FileGroup/File");
but nodes is always empty, regardless of how I call the nav.Select method. I barely used XPath before so maybe I'm doing it wrong - but what? Only the selector * gives me the root node.
What would be the selector to get the Path Attribute of all File nodes?
EDIT: SOLUTION
Thanks to Kirill, the final solution looks like this:
var path = Server.MapPath("~/Scripts/ScriptfilesMashup.chirp.config");
var file = new XPathDocument(path);
var nav = file.CreateNavigator();
var ns = "urn:ChirpyConfig";
XmlNamespaceManager nsMgr = new XmlNamespaceManager(nav.NameTable);
nsMgr.AddNamespace("x", ns);
var nodes = nav.Select("/x:root/x:FileGroup/x:File/#Path", nsMgr);
while(nodes.MoveNext())
{
var path = nodes.Current.Value;
}
It is because elements root, FileGroup and File are defined in urn:ChirpyConfig namespace.
Use this:
XPathDocument xmldoc = new XPathDocument(xmlFile);
XPathNavigator nav = xmldoc.CreateNavigator();
XmlNamespaceManager nsMgr = new XmlNamespaceManager(nav.NameTable);
nsMgr.AddNamespace("x", "urn:ChirpyConfig");
XPathNavigator result = nav.SelectSingleNode("/x:root/x:FileGroup/x:File", nsMgr);
XML file:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<content>
<FingerPrintUserDetails>
<UserID>e57645</UserID>
<UserName>Jill</UserName>
<FPData>AQAAABQAAAD0AAAAAQASAAEAWgAAAAAA8AAAAHfrWpB6BHZBL10voxpdxu2Km5XVNh*oUNC80Rvpql3RhlqOiBPeet6iRPwb/BdN1fCF4Y/WHbQ40*mqoUKqilgN7bUqNuXP7M299HUWtoAGEO3nDKXXAnHd7dgytZbmHVv*mRBPJDSRw9VY/R1yOIu2cCDlLM*F8Q1lvTfMFDdfwNZynI0e2ZauCF58f0UX56XLFBallaAauxP5mvvhUmcmc6ITg7RhH9wc4181kgPjCuZg38pQepE5U07XIa3hQP8fwxPzdprifXECgB1Z3pTXWQP0q4ZD0Inlbq6Gszo1ucPrhQA0jYQRXtJUVuyBeg</FPData>
<Address>Pune</Address>
<ContactNo>848488484884</ContactNo>
</FingerPrintUserDetails>
<FingerPrintUserDetails>
<UserID>444</UserID>
<UserName>John</UserName>
<FPData>AQAAABQAAADkAAAAAQASAAEAZAAAAAAA4AAAAPLnmQ8FymAAHWYutR5pdtYvfDVmjsqLeli8tOSTFAtw6AkfA0r8XwrMzp9jFZJI7DlBk4G94BMq55gPEG7uBLZUNYrvhv0jDlDFMOjWGJ9RoWekFveTC*oZ7Tq/xmxuvY6FzLHVo*xzdKQI73Y0f9/eeMC0OgqnbQ3I0IP6cTkkKnTUZJOXKr7IFPHkjJAvCDmU7ec4vG50JHdBJIObmbzVcO0huTUQyE7CR1qYkUjmNFKgVKWPLRupEk4l/Ek0BuAba*9JlhBVUHzZuKbDQLc9lTFwevAgDuuAwxfZaLS*</FPData>
<Address>nagpur</Address>
<ContactNo>464645763</ContactNo>
</FingerPrintUserDetails>
<FingerPrintUserDetails>
<UserID>5555</UserID>
<UserName>Jack</UserName>
<FPData>AQAAABQAAAAEAQAAAQASAAEAZAAAAAAA9AAAAPz5mQO3uTeXLfU5Mb74XbCX5rERGZFPQMVG1vPpX87306O5oURlYiIe5dasJ2S8NlBZu2UU3zaUpNnB7viYDB6*wfFlgtopn/WdbXW0Yhik3hj8nDreEmaK12To8qfAJx2ooq43i0wBIL*0Jkba*QpHIprSajrhnCg1PjOLMP37sEauJUwXJaoDR/PPQYIxTFE5kf8xzGlJmqiGejD*Y8R3ewU9yIrxkdQ0S//LCdacULt2QvS/I3APo/j0FAgSCOU3SBLdDL6UBPD4fLeEzo7uUIW8gUMThzZX*u2iUuNwJdqWC2NsFtWkUWt03sz3xYQpR8pLA4vrsUmldzUMWe8</FPData>
<Address>beed</Address>
<ContactNo>5745745747</ContactNo>
</FingerPrintUserDetails>
</content>
C#:
XmlDocument doc = new XmlDocument();
doc.Load("E://BioEnable_Project//fp_project_using_xml//fp_project_using_xml//Capture_Data.xml");
XmlElement root = doc.DocumentElement;
XmlNodeList nodes = root.SelectNodes("FPData");
foreach(XmlElement node in nodes)
{
MessageBox.Show(node.Value);
}
I have to check FPData value on each node..i use above code but not getting..
In your XPath, provide the full path to the node.
XmlNodeList nodes = root.SelectNodes("/content/FingerPrintUserDetails/FPData");
What is happening is that there is no direct FPData node under the document root.
XmlNodeList nodes = root.SelectNodes("content/FingerPrintUserDetails");
it will return array of FingerPrintUserDetails, then find FPData in them
XmlNodeList res = nodes[index].SelectNodes("FPData");
Using LINQ to XML:
XDocument doc = XDocument.Load("XmlFilePath");
var selectors = from elements in doc.Elements("content").Elements("FingerPrintUserDetails")
select elements;
foreach (var element in selectors)
{
MessageBox.Show(element.Element("FPData").Value);
}
XmlDocument doc = new XmlDocument();
doc.Load("E://BioEnable_Project//fp_project_using_xml//fp_project_using_xml//Capture_Data.xml");
XmlNodeList lst = doc.GetElementsByTagName("FingerPrintUserDetails");
foreach (XmlElement elem in lst)
{
XmlNode pfData = doc.GetElementsByTagName("FPData")[0];
MessageBox.Show(pfData.Value);
}
I have been trying to read an xml file. I have to extract value of nodes "Date" and "Name", but the problem is, they might appear at any level in XML hierarchy.
So when I try with this code,
XmlDocument doc = new XmlDocument();
doc.Load("test1.xml");
XmlElement root = doc.DocumentElement;
XmlNodeList nodes = root.SelectNodes("//*");
string date;
string name;
foreach (XmlNode node in nodes)
{
date = node["date"].InnerText;
name = node["name"].InnerText;
}
and the XML file is ::
<?xml version="1.0" encoding="utf-8"?>
<root>
<child>
<name>Aravind</name>
<date>12/03/2000</date>
</child>
</root>
the above code errors out, as <name> and <date> are not immediate child Elements of root.
is it possible to assume that parent/root nodes are unknown and just with the name of the nodes, copy the values ??
Depending on the exception you are getting, this may or may not be the exact solution. However, I would definitely check that date and name exist before doing a .InnerText on them.
foreach (XmlNode node in nodes)
{
dateNode = node["date"];
if(dateNode != null)
date = dateNode.InnerText;
// etc.
}
I would read up on XPATH and XPATH for C# to do this more efficiently
http://support.microsoft.com/kb/308333
http://www.w3schools.com/XPath/xpath_syntax.asp
Here's a little method that should allow you to get the innerText easily.
function string GetElementText(string xml, string node)
{
XPathDocument doc = new XPathDocument(xml);
XPathNavigator nav = doc.CreateNavigator();
XPathExpression expr = nav.Compile("//" + node);
XPathNodeIterator iterator = nav.Select(expr);
while (iterator.MoveNext())
{
// return 1st but there could be more
return iterator.Current.Value;
}
}
Try to use LINQ:
string xml = #"<?xml version='1.0' encoding='utf-8'?>
<root>
<date>12/03/2001</date>
<child>
<name>Aravind</name>
<date>12/03/2000</date>
</child>
<name>AS-CII</name>
</root>";
XDocument doc = XDocument.Parse(xml);
foreach (var date in doc.Descendants("date"))
{
Console.WriteLine(date.Value);
}
foreach (var date in doc.Descendants("name"))
{
Console.WriteLine(date.Value);
}
Console.ReadLine();
The Descendants method allows you to get all the elements that have a specified name.