I have a xml document like this and I need to access the "employees", "employee" elements so I am trying to use linq's XDocument class to get the employee elements but it always returns empty value.
Sample xml:
<organization>
<metadata>
</metadata>
<main>
<otherInfo>
</otherInfo>
<employeeInfo>
<employees>
<employee>
<id>1</id>
<name>ABC</name>
</employee>
<employee>
<id>2</id>
<name>ASE</name>
</employee>
<employee>
<id>3</id>
<name>XYZ</name>
</employee>
</employees>
</employeeInfo>
</main>
</organization>
C# code:
XDocument xDoc = XDocument.Parse(xmlString);
var allEmployees = from d in xDoc.Descendants("employeeInfo")
from ms in d.Elements("employees")
from m in ms.Elements("employee")
select m;
It kind of depends on what information you need. Your select returns an IEnumerable list.
This code will print out each employee
string xmlString = #"<organization>
<metadata>
</metadata>
<main>
<otherInfo>
</otherInfo>
<employeeInfo>
<employees>
<employee>
<id>1</id>
<name>ABC</name>
</employee>
<employee>
<id>2</id>
<name>ASE</name>
</employee>
<employee>
<id>3</id>
<name>XYZ</name>
</employee>
</employees>
</employeeInfo>
</main>
</organization>";
XDocument xDoc = XDocument.Parse(xmlString);
var allEmployees = from d in xDoc.Descendants("employeeInfo")
from ms in d.Elements("employees")
from m in ms.Elements("employee")
select m;
foreach (var emp in allEmployees) {
Console.WriteLine(emp);
}
Console.Read();
XDocument xDoc = XDocument.Parse(xmlString);
var allEmployees = (from r in xDoc.Descendants("employee")
select new
{
Id = r.Element("id").Value,
Name = r.Element("name").Value
}).ToList();
foreach (var r in allEmployees)
{
Console.WriteLine(r.Id + " " + r.Name);
}
Just use Descendants("Employee");
XDocument xDoc = XDocument.Parse(xmlString);
var allEmployees = xDoc.Descendants("employee").ToList();
Related
I have the following problem, I want to select the book with the author "Johnny Dapp33", which unfortunately does not work.
XML Code:
<employees xmlns:bar="http://www.bar.org">
<employee id="Test1">
<name>Johnny Dapp</name>
<author>Al Pacino</author>
</employee>
<employee id="Test2">
<name>Johnny Dapp33</name>
<author>Al Pacino</author>
</employee>
</employees>
I would have tried it via ".SelectSingleNode", unfortunately I always fail with the XPath.
Thank you for your help!
Let's say we have a file called Employees.xml in our project directory.
We can load the xml file in our memory by using this assignment:
XmlDocument doc = new XmlDocument();
doc.Load("Employees.xml");
Second we try to find a single node (presuambly) by its id in a structure employees/employee (this is our path), no we have to add the search param (id in this case) like this:
XmlNode singleNode = doc.SelectSingleNode("/employees/employee[#id='Test1']");
Console.WriteLine(singleNode.OuterXml);
However if we only know the name we are looking for we can also search for that specific value like this. We search in the employee node for the node value of name with the value of Johnny Dapp33:
XmlNode singleNode = doc.SelectSingleNode("descendant::employee[name='Johnny Dapp33']");
Console.WriteLine(singleNode.OuterXml);
While dealing with XMl, it is better to use LINQ to XML API.
It is available in the .Net Framework since 2007.
c#
void Main()
{
const string filePath = #"e:\Temp\WizardZZ.xml";
XDocument xdoc = XDocument.Load(filePath);
var employee = xdoc.Descendants("employee")
.Where(d => d.Elements("name").FirstOrDefault().Value.Equals("Johnny Dapp33"));
Console.WriteLine(employee);
}
Output
<employee id="Test2">
<name>Johnny Dapp33</name>
<author>Al Pacino</author>
</employee>
If you need to use XPath (and there must be a very strong reason for it), you can use it with XElement:
var xml = """
<employees xmlns:bar="http://www.bar.org">
<employee id="Test1">
<name>Johnny Dapp</name>
<author>Al Pacino</author>
</employee>
<employee id="Test2">
<name>Johnny Dapp33</name>
<author>Al Pacino</author>
</employee>
</employees>
""";
var x = XElement.Parse(xml);
var employees = x.XPathSelectElements("/employee[name='Johnny Dapp33']");
if (employees is not null)
{
foreach (var employee in employees)
{
WriteLine((string)employee.Element("name") ?? "[name] not found");
}
}
else
{
WriteLine("did not find any employees");
}
I am trying to merge two XMLs with same structure but different data into one.
I am getting this error: A node of type Document cannot be added to content.
Below is my code
var productElements =
testGroupProvider.GetTestGroup().ProductTests.Select(
productTest => new XElement(xNamespace + "Product",
new XElement(xNamespace + "ExternalId", productTest.ProductNameKey),
new XElement(xNamespace + "Name", testGroupProvider.GetProductName(productTest)),
new XElement(xNamespace + "ImageUrl", ChoiceBaseHostName + GetProductImageUrl(productTest, TargetDatabase))));
var root = new XDocument(
new XElement(xNamespace + "Feed",
new XAttribute("xmlns", xNamespace),
new XAttribute("name", BVFeedsName),
new XAttribute("incremental", "true"),
new XAttribute("extractDate", DateTime.Now.ToString("o")),
new XElement(xNamespace + "Categories",
new XElement(xNamespace + "Category",
new XElement(xNamespace + "ExternalId", testGroupProvider.GetProductGroup().Id),
new XElement(xNamespace + "Name", testGroupProvider.GetProductGroup().Name),
testGroupProvider.GetTestGroup().Name),
new XElement(xNamespace + "Products", productElements)));
var filePath = #"D:\testXML\test.xml";
XElement xml = XElement.Load(filePath);
xml.Add(root);
xml.Save(filePath);
Can anyone tell me what i am doing wrong.
This is the XML structure in test.xml
<?xml version="1.0" encoding="utf-8"?>
<Feed xmlns="http://www.bazaarvoice.com/xs/PRR/ProductFeed/5.6" name="Choice" incremental="true" extractDate="2016-07-12T15:24:44.5732750+10:00">
<Categories>
<Category>
<ExternalId>{09B3B4FB-F5CF-4522-BE96-4C4B535580C3}</ExternalId>
<Name>Cereal and muesli</Name>
</Category>
</Categories>
<Products>
<Product>
<ExternalId>coles-almond-hazelnut-macadamia-cluster-fusions</ExternalId>
<Name>Coles Almond, Hazelnut & Macadamia Cluster Fusions</Name>
<ImageUrl></ImageUrl>
</Product>
</Products>
</Feed>
The second XML has the same structure with different products
<?xml version="1.0" encoding="utf-8"?>
<Feed xmlns="http://www.bazaarvoice.com/xs/PRR/ProductFeed/5.6" name="Choice" incremental="true" extractDate="2016-07-12T15:24:44.5732750+10:00">
<Categories>
<Category>
<ExternalId>{12}</ExternalId>
<Name>cat1</Name>
</Category>
</Categories>
<Products>
<Product>
<ExternalId>Id</ExternalId>
<Name>Ccoles</Name>
<ImageUrl></ImageUrl>
</Product>
</Products>
</Feed>
I want to combine them like below
<?xml version="1.0" encoding="utf-8"?>
<Feed xmlns="http://www.bazaarvoice.com/xs/PRR/ProductFeed/5.6" name="Choice" incremental="true" extractDate="2016-07-12T15:24:44.5732750+10:00">
<Categories>
<Category>
<ExternalId>{09B3B4FB-F5CF-4522-BE96-4C4B535580C3}</ExternalId>
<Name>Cereal and muesli</Name>
</Category>
<Category>
<ExternalId>{12}</ExternalId>
<Name>cat1</Name>
</Category>
</Categories>
<Products>
<Product>
<ExternalId>coles-almond-hazelnut-macadamia-cluster-fusions</ExternalId>
<Name>Coles Almond, Hazelnut & Macadamia Cluster Fusions</Name>
<ImageUrl></ImageUrl>
</Product>
<Product>
<ExternalId>Id</ExternalId>
<Name>Ccoles</Name>
<ImageUrl></ImageUrl>
</Product>
</Products>
</Feed>
A xml document must have only one root.
Working with the documents you attached, you can replace the xml.Add(root); with the following (i.e. it will add each node under one root to the other xml root)
foreach (var child in root.Root.Elements())
{
xml.Element(child.Name.ToString()).Add(child.Nodes());
}
Edit - A further generalization
You can generalize the above code using a Merge extension of 2 XElements so that it reads as follows
foreach (var child in root.Elements())
{
xml.Element(child.Name.ToString()).Merge(child, xNamespace + "ExternalId");
}
Having defined the extension
public static void Merge(this XElement root1, XElement root2, XName element_id)
{
root1.Add(root2.Elements().Except(root1.Elements(), new MyComparer(element_id)));
}
with a xml comparer
public class MyComparer : IEqualityComparer<XElement>
{
private XName _element_id;
public MyComparer(XName element_id)
{
_element_id = element_id;
}
public bool Equals(XElement x, XElement y)
{
return x.Element(_element_id).Value.Equals(y.Element(_element_id).Value);
}
public int GetHashCode(XElement el)
{
return el.Element(_element_id).Value.GetHashCode();
}
}
Select correct nodes to add and correct nodes to be added.
var filePath = #"D:\testXML\test.xml";
XElement xml = XElement.Load(filePath);
var xmlCategories = xml.Descendants("Categories").First();
var rootCategories = root.Descendants("Category");
xmlCategories.Add(rootCategories);
var xmlProducts = xml.Descendants("Products").First();
var rootProducts = root.Descendants("Product");
xmlProducts.Add(rootProducts);
xml.Save(filePath);
Be crystal clear what you are doing.
Try this
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication2
{
class Program
{
const string FILENAME1 = #"c:\temp\test1.xml";
const string FILENAME2 = #"c:\temp\test2.xml";
static void Main(string[] args)
{
XDocument doc1 = XDocument.Load(FILENAME1);
XDocument doc2 = XDocument.Load(FILENAME2);
XElement category1 = doc1.Descendants().Where(x => x.Name.LocalName == "Categories").FirstOrDefault();
XElement category2 = doc2.Descendants().Where(x => x.Name.LocalName == "Categories").FirstOrDefault();
category1.Add(category2.Descendants());
XElement product1 = doc1.Descendants().Where(x => x.Name.LocalName == "Products").FirstOrDefault();
XElement product2 = doc2.Descendants().Where(x => x.Name.LocalName == "Products").FirstOrDefault();
product1.Add(product2.Descendants());
}
}
}
Try this, sorry about the VB
'second is The second XML has the same structure with different products
Dim combined As XElement = New XElement(test) 'create copy of test.xml
combined.<Categories>.LastOrDefault.Add(second.<Categories>.Elements)
combined.<Products>.LastOrDefault.Add(second.<Products>.Elements)
or
'if test can be used to combine then
test.<Categories>.LastOrDefault.Add(second.<Categories>.Elements)
test.<Products>.LastOrDefault.Add(second.<Products>.Elements)
The result is
<Feed name="Choice" incremental="true" extractDate="2016-07-12T15:24:44.5732750+10:00" xmlns="http://www.bazaarvoice.com/xs/PRR/ProductFeed/5.6">
<Categories>
<Category>
<ExternalId>{09B3B4FB-F5CF-4522-BE96-4C4B535580C3}</ExternalId>
<Name>Cereal and muesli</Name>
</Category>
<Category>
<ExternalId>{12}</ExternalId>
<Name>cat1</Name>
</Category>
</Categories>
<Products>
<Product>
<ExternalId>coles-almond-hazelnut-macadamia-cluster-fusions</ExternalId>
<Name>Coles Almond, Hazelnut & Macadamia Cluster Fusions</Name>
<ImageUrl></ImageUrl>
</Product>
<Product>
<ExternalId>Id</ExternalId>
<Name>Ccoles</Name>
<ImageUrl></ImageUrl>
</Product>
</Products>
</Feed>
The test data I used is
Dim test As XElement =
<Feed xmlns="http://www.bazaarvoice.com/xs/PRR/ProductFeed/5.6" name="Choice" incremental="true" extractDate="2016-07-12T15:24:44.5732750+10:00">
<Categories>
<Category>
<ExternalId>{09B3B4FB-F5CF-4522-BE96-4C4B535580C3}</ExternalId>
<Name>Cereal and muesli</Name>
</Category>
</Categories>
<Products>
<Product>
<ExternalId>coles-almond-hazelnut-macadamia-cluster-fusions</ExternalId>
<Name>Coles Almond, Hazelnut & Macadamia Cluster Fusions</Name>
<ImageUrl></ImageUrl>
</Product>
</Products>
</Feed>
Dim second As XElement =
<Feed xmlns="http://www.bazaarvoice.com/xs/PRR/ProductFeed/5.6" name="Choice" incremental="true" extractDate="2016-07-12T15:24:44.5732750+10:00">
<Categories>
<Category>
<ExternalId>{12}</ExternalId>
<Name>cat1</Name>
</Category>
</Categories>
<Products>
<Product>
<ExternalId>Id</ExternalId>
<Name>Ccoles</Name>
<ImageUrl></ImageUrl>
</Product>
</Products>
</Feed>
The XElements can be loaded like this
test = XElement.Load("PATH")
second = XElement.Load("second PATH")
and saved like this
test.Save("PATH")
second.Save("second PATH")
combined.Save("combined PATH")
I have a trouble reading from XML file using LINQ.
Here is my XML file
<?xml version="1.0" encoding="utf-8"?>
<Employees>
<Employee>
<Name Type="First">Jack</Name>
<Name Type="Last">Black</Name>
</Employee>
<Employee>
<Name Type="First">John</Name>
<Name Type="Last">Blue</Name>
</Employee>
<Employee>
<Name Type="First">Dan</Name>
<Name Type="Last">Red</Name>
</Employee>
<Employee>
<Name Type="First">Patrick</Name>
<Name Type="Last">Green</Name>
</Employee>
</Employees>
The code I am using is following
XElement doc = XElement.Load("xmldoc.xml");
var query = from x in doc.Elements("Employee") where x.Element("Name").Attribute("Type").Value == "First" select x;
foreach (XElement item in query)
{
Console.WriteLine(item.Element("Name").Value);
}
This code returns me all first names but when i change attribute value from first to last it comes blank.
When i switch name nodes it retuns last names. For me it looks like for each employe query returns values from first name node and ignoring the second one. Could you please help me fix this?
The problem is that the x.Element("Name") call will return the first Name element. You actually need to query all the Name elements and filter for the one with the Last attribute value.
Try this instead:
var query = from x in doc.Elements("Employee").Elements("Name")
where x.Attribute("Type").Value == "Last"
select x;
foreach (XElement item in query)
{
Console.WriteLine(item.Value);
}
I am beginner in C#.
Simple Example of bigger case:
Input:
<?xml version="1.0" encoding="utf-8"?>
<products>
<product>
<id>1</id>
<name>John</name>
</product>
<product>
<id>2</id>
<name>Tom</name>
</product>
<product>
<id>3</id>
<name>Sam</name>
</product>
</products>
</xml>
Output(for id=1):
<id>2</id>
<name>Tom</name>
My part code try psedocode:
XDocument doc=XDocument.Parse(".............");
var els= doc.Descendants("product");
foreach(e in els){
node=e.Element("id");
if(2==node.Value){
return e;
}
}
Please help,
Thanks
Currently your xml file is not well-formatted - remove closing </xml> tag from your file to make it valid. And here is the query:
int id = 1;
XDocument xdoc = XDocument.Load(path_to_xml);
var product = xdoc.Descendants("product")
.Where(p => (int)p.Element("id") == id)
.SingleOrDefault();
This query will return whole <product> element or null if match not found.
Also I believe product name will be enough for you to select (because you already have product id):
var name = xdoc.Descendants("product")
.Where(p => (int)p.Element("id") == id)
.Select(p => (string)p.Element("name"))
.SingleOrDefault();
Returns Tom for id = 2
This will return the product (as in your question) not the id
var product = doc.XPathSelectElement("//product[id and id[text() = '1']]");
You might be looking for XPath:
root.XPathSelectElements(#"//products/product/id[text()='2']")
Edit To the comment: Directly getting the name: //products/product/id[text()='2']/../name
See full example
using System.Xml.Linq;
using System.Xml.XPath;
public class Program
{
public static void Main(string[] args)
{
var doc = XDocument.Parse(XML);
foreach(var n in doc.Root.XPathSelectElements(
#"//products/product/id[text()='2']"))
{
System.Console.WriteLine("Not that hard: '{0}'", n.Parent.Element("name").Value);
}
// Direct query for name:
foreach(var n in doc.Root.XPathSelectElements(
#"//products/product/id[text()='2']/../name"))
{
System.Console.WriteLine("Directly: '{0}'", n.Value);
}
}
private const string XML =
#"<?xml version=""1.0"" encoding=""utf-8""?>
<products>
<product>
<id>1</id>
<name>John</name>
</product>
<product>
<id>2</id>
<name>Tom</name>
</product>
<product>
<id>3</id>
<name>Sam</name>
</product>
</products>";
}
Printing:
Not that hard: 'Tom'
Directly: 'Tom'
I need to delete specific employee node and also its child node based on the value of id.
For example, here I need to delete employee tag with id="2".
<company>
<employee>
<id>1</id>
<name>sa</name>
</employee>
<employee>
<id>2</id>
<name>ssa</name>
</employee>
</company>
Assuming you have loaded that into an XmlDocument named doc:
XmlElement el = (XmlElement)doc.SelectSingleNode("/company/employee[id=2]");
if(el != null) { el.ParentNode.RemoveChild(el); }
Try this one
XmlDocument xmlDoc = new XmlDocument();
XmlNode nodeToDelete = xmlDoc.SelectSingleNode("/root/XMLFileName[#ID="+nodeId+"]");
if (nodeToDelete != null)
{
nodeToDelete.ParentNode.RemoveChild(nodeToDelete);
}
xmlDoc.Save("XMLFileName.xml")