Develop Reference

How to get all descendants with a particular attribute - Linq to Xml

<Grid>
<StringColumn Header="Name"/>
<DateColumn Header="Date"/>
</Grid>
There is probably an existing answer to this question, but I cannot seem to find it.
I need to find all xml elements which have an attribute of "Header"
The name of the element can be different.
How do I do that with Linq to XML?

This should give you the required elements:
XDocument document = ...;
var elementsWithHeader = document.Descendants()
.Where(e => e.Attributes().Any(a => a.Name == "Header"));

Something like this should work:
IEnumerable<XElement> elements =
from el in root.Elements("Grid")
where (string) el.Attribute("Header") != null
select el;

Use this:
var grid = XElement.Parse(#"<Grid>
<StringColumn Header=""Name""/>
<DateColumn Header=""Date""/>
</Grid>");
var elements = grid.XPathSelectElements(".//*[#Header]");

Using xml linq. Code is prints any Grid elements that have children with Header attributes.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication7
{
class Program
{
const string FILENAME = #"c:\temp\test.xml";
static void Main(string[] args)
{
XDocument doc = XDocument.Load(FILENAME);
List<XElement> headers = doc.Descendants("Grid").Where(x => x.Elements().Where(y => y.Attribute("Header") != null).Any()).ToList();
}
}
}

Getting an element tree broken down from an XML

I have an XML and I am try to break down the elements so that it shows the path of every element. I have put an example of the code below and what the output I want to see.
The XML data is as per the below.
<a:Clients>
<a:Client1>
<a:Initial>
<a:FirstName>data</a:FirstName>
<a:LastName>data</a:LastName>
</a:Initial>
<a:FirstName>data</a:FirstName>
<a:MiddleName />
<a:LastName>data</a:LastName>
<a:Title>Mr</a:Title>
<a:MaritalStatus>Divorced</a:MaritalStatus>
<a:MaidenName>data</a:MaidenName>
I want to output it so it shows as
Clients/Client1
Clients/Client1/Initilal
Clients/Client1/Initial/FirstName
etc So I want to get all the elements of my xml to appear in this order for a large XML document. I dont want any data that sits inbetween the tags, Just the element paths.
I have written the below code in vs 2015 - Console Application to try and output it in this order but it is not working correctly. The c# code im using is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using System.Xml.XPath;
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
XNamespace ns = "http://www.test.net/author/1.0";
XDocument doc = XDocument.Load("test.xml");
var allElements = doc.Descendants();
foreach (var element in allElements)
Console.WriteLine(allElements);
Console.ReadLine();
}
}
}
The output im currently getting is:
Output
I have looked over Stack Overflow for answers but nothing seems to be exactly what I need and the ones I have tried have not worked either. Not sure if there is an easier way to do this?
Help would be greatly appreciated

I managed to do it in reversed order:
Client1/Clients
So i just entered all into a list and print it in reversed order later to be in the right order.
XDocument doc = XDocument.Load("test.xml");
var allElements = doc.Descendants();
var elemants = doc.Elements();
foreach (var element in allElements)
{
var current = element;
List<string> names = new List<string>();
while (current.Parent != null)
{
names.Add(current.Name.LocalName);
current = current.Parent;
}
names.Add(current.Name.LocalName);
names.Reverse();
foreach(var name in names)
Console.Write(name + "/");
Console.WriteLine();
}
I hope thats what you need.

Read XML with ab:tag format using c#

I am new to xml, c#. I am following this tutorial: http://www.dotnetcurry.com/ShowArticle.aspx?ID=564
But my xml file is little different. The xml that I want to read in my c# code is this: http://api.nextag.com/buyer/synd.jsp?search=ipod&ver=15&token=AQB7dB$kB8ULvbGT&pid=1807
Code I am trying to read this xml is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
XElement xelement = XElement.Load("http://api.nextag.com/buyer/synd.jsp?search=ipod&ver=15&token=AQB7dB$kB8ULvbGT&pid=1807");
XNamespace nxtg = "http://schemas.microsoft.com/office/infopath/2003/myXSD/2011-01-11T08:31:30";
IEnumerable<XElement> employees = xelement.Elements();
// Read the entire XML
foreach (var employee in employees)
{
//Console.WriteLine(employee);
//Console.WriteLine(employee.Value);
if (employee.Element(nxtg + "search-category") == null)
continue;
else
Console.WriteLine(employee.Element(nxtg + "search-category").Value);
//Console.WriteLine(employee.Element("EmpId").Value);
}
But no luck. Anyone can help me please.

xelement.Elements() will return direct children of root element. In your case that will be elements nxtg:publisher, nxtg:search-query, nxtg:search-category etc. Thus nxtg:search-category is a direct child of root element, it also will selected as employee. That's why you can't find it in children of employee. You should do following instead:
// keep in mind, you have incorrect namespace value
XNamespace nxtg = "http://namespace.nextag.com/business-objects";
var searchCategory = xelement.Element(nxtg + "search-category");
var node = searchCategory.Element(nxtg + "node");
var displayName = (string)node.Element(nxtg + "display-name");
var value = (int)node.Element(nxtg + "value");

Select XML Nodes by Attribute Value

I have a oracle query to generate below xml result and I like to check only if there is any attribute value inside SUBQUERY and COL_LIST_ITEM nodes not others. If nodes has attribute value than write "it has attribute value" else "no attribute value". I am not sure if my code is correct! Is there any way to do that?
<VIEW xmlns="http://xmlns.oracle.com/ku" version="1.0">
<SCHEMA value1="USER1">USER2</SCHEMA>
<NAME value1="VIEW_TBL_A">VIEW_TBL_B</NAME>
<COL_LIST>
<COL_LIST_ITEM>
</COL_LIST_ITEM>
<COL_LIST_ITEM src="2">
<NAME>FIELD_A2</NAME>
</COL_LIST_ITEM>
</COL_LIST>
<SUBQUERY value1="SELECT FIELD_A1
FROM TBL_A
WHERE FIELD_A1 = 111">SELECT FIELD_A1, FIELD_A2
FROM TBL_A
WHERE FIELD_A1 = 111</SUBQUERY>
</VIEW>
Here is my Code
using (OracleConnection conn1 = new OracleConnection(oradb1))
{
conn1.Open();
using (OracleCommand crtCommand = new OracleCommand("SELECT dbms_metadata.get_sxml('VIEW','VIEW_TBL_A') FROM dual;", conn1))
{
XmlDocument xml = new XmlDocument();
xml.LoadXml(crtCommand.ExecuteScalar().ToString());
}
}

how about an XDocument
XDocument doc = XDocument.Parse(crtCommand.ExecuteScalar().ToString());
XNamespace ns = "http://xmlns.oracle.com/ku";
if (doc.Descendants(ns + "COL_LIST_ITEM").Any(c => c.Attributes().Any()))
Console.WriteLine("COL_LIST has value");
and of course add your other nodes in to check

You should use LINQ to XML to query your XML document:
XDocument document = XDocument.Load(xmlFile);
IEnumerable<XElement> elements =
from element in document.Root.Elements("SUBQUERY")
where element.HasAttributes
select element;
Refer to the article here for more details.

I also ran into a similar problem, while working on a Universal Windows App, and was also very frustrated when VS didn't specify clearly what the problem was. Although after hours of surfing the web, I found the solution. It was simple, but i don't know why VS didn't specify it. Anyways, here it is :-
Add another reference to your project :-
using System.Linq; apart from using System.Xml.Linq;
using System.Linq;
using System.Xml.Linq;
The errors will go & the project will build.
For more help reference this article :-
problem with using refrence to System.Xml.Linq

What is the best way to read an attribute from an xml string in c#

I have the following xml as string:
<cfdi:Comprobante version="3.0"
xsi:schemaLocation="http://www.sat.gob.mx/cfd/3 http://www.sat.gob.mx/sitio_internet/cfd/3/cfdv3.xsd"
serie="A"
folio="6"
fecha="2011-07-22T13:51:42"
formaDePago="Pago en una sola exhibición"
sello="XlSJYAxauwYbI"
noCertificado="00001000000101242210"
certificado="YtEQOHw02OGx6E="
condicionesDePago="Paguese a mas tardar el 21/08/2011."
subTotal="123"
Moneda="MXN"
total="123"
tipoDeComprobante="ingreso">
<cfdi:Complemento>
<tfd:TimbreFiscalDigital FechaTimbrado="2011-07-22T13:51:47"
UUID="41C8A54F-4956-1BAD-F2CB-48E8343918FD"
noCertificadoSAT="00001000000102616613"
selloCFD="wrwerewe"
version="1.0"
xsi:schemaLocation="http://www.sat.gob.mx/TimbreFiscalDigital http://www.sat.gob.mx/sitio_internet/timbrefiscaldigital/TimbreFiscalDigital.xsd"/>
</cfdi:Complemento>
</cfdi:Comprobante>
I want to read the attribute UUID inside the node tfd:TimbreFiscalDigital so I was wondering how to do this using c#, this might be silly but please understand I'm new in c#.
Note: This xml is inside a string, not in a file (our provider's webservice returns the xml as string, is not our fault)
Note2: I can use Linq, or any other library, that's not a prob
Thanks!!

I wrapped this in a root node declaring the namespaces. I'm also using XPath to query for the node.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using System.Xml.XPath;
using System.Xml;
class Program
{
static void Main(string[] args)
{
var doc = #"
<Root xmlns:xsi='http://someuri' xmlns:cfdi='http://someuri2' xmlns:tfd='http://someuri3'>
<cfdi:Comprobante version='3.0'
xsi:schemaLocation='http://www.sat.gob.mx/cfd/3 http://www.sat.gob.mx/sitio_internet/cfd/3/cfdv3.xsd'
serie='A'
folio='6'
fecha='2011-07-22T13:51:42'
formaDePago='Pago en una sola exhibición'
sello='XlSJYAxauwYbI'
noCertificado='00001000000101242210'
certificado='YtEQOHw02OGx6E='
condicionesDePago='Paguese a mas tardar el 21/08/2011.'
subTotal='123'
Moneda='MXN'
total='123'
tipoDeComprobante='ingreso'>
<cfdi:Complemento>
<tfd:TimbreFiscalDigital FechaTimbrado='2011-07-22T13:51:47'
UUID='41C8A54F-4956-1BAD-F2CB-48E8343918FD'
noCertificadoSAT='00001000000102616613'
selloCFD='wrwerewe'
version='1.0'
xsi:schemaLocation='http://www.sat.gob.mx/TimbreFiscalDigital http://www.sat.gob.mx/sitio_internet/timbrefiscaldigital/TimbreFiscalDigital.xsd'/>
</cfdi:Complemento>
</cfdi:Comprobante>
</Root>";
var uuid = XDocument.Parse(doc)
var uuid = XDocument.Parse(doc)
.XPathSelectElement("//*[local-name() = 'TimbreFiscalDigital']")
.Attribute("UUID").Value;
// Work with uuid
Console.Read();
}
}

Because you have namespace prefixes, you'll have to use XNamespace instances to help you reference the elements.
// We use these to establish our namespace prefixes
XNamespace cfdi = #"http://www.sat.gob.mx/cfd/3";
XNamespace tfd = #"http://www.sat.gob.mx/TimbreFiscalDigital";
var xdoc = XDocument.Parse(xml);
// Walk down the XML tree to tfd:TimbreFiscalDigital
var elt = xdoc.Element(cfdi + "Comprobante")
.Element(cfdi + "Complemento")
.Element(tfd + "TimbreFiscalDigital");
// Alternately
// var elt = xdoc.Descendants(tfd + "TimbreFiscalDigital")
// .First();
var uuid = (string)elt.Attribute("UUID");
// You can convert attributes and element values to lots of built-in types
// See the Explicit Conversions for XAttribute and XElement on MSDN
var date = (DateTime)elt.Attribute("FechaTimbrado");
Further reading:
MSDN: XElement Operators
MSDN: XAttribute Operators

I find linq's XDocument and related classes to be particularly simple and straightforward to use:
string uuid = XDocument.Parse(xmlString)
.Descendants("TimbreFiscalDigital")
.Attributes("UUID")
.First()
.Value;