Develop Reference

LINQ to read XML String and put into a variable

I am trying to read XML using LINQ. Previously I use XMLDocument to read but it gives an error and someone on StackOverflow encourage me to use LINQ.
Below is the code i previously used for the XMLDocument
string soapmessage = #"<?xml version=""1.0"" encoding=""UTF - 8""?>" + "\n" + response.Content;
XmlDocument xml = new XmlDocument();
xml.LoadXml(soapmessage); //loading soap message as string
XmlNamespaceManager manager = new XmlNamespaceManager(xml.NameTable);
manager.AddNamespace("d", "http://tempuri.org/");
manager.AddNamespace("bhr", "http://52.187.127.196:5000/api/gsowebservice.asmx");
XmlNodeList xnList = xml.SelectNodes("//bhr:FourMonthsAhead1Response", manager);
int nodes = xnList.Count;
string Status = xnList[0]["FourMonthsAhead1Result"]["PlantForecastIntervals"]["PlantForecastIntervalNode"]["IntervalStartTime"].InnerText;
Console.WriteLine(Status);
Console.ReadLine();
I am trying to get the <IntervalStartTime> from the first <PlantForecastIntervalNode> into a datetime variable;
Below attaced the XML im trying read:
Below is some of the XML code. I can't paste it here because the code is 2322 lines long so I shortened the code to this.
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<s:Body>
<FourMonthsAhead1Response xmlns="http://tempuri.org/">
<FourMonthsAhead1Result xmlns="LSS.solar.webservice">
<PlantDescription xmlns="http://base.datacontract">*PlantName*</PlantDescription>
<PlantForecastIntervalsCount xmlns="http://base.datacontract">2976</PlantForecastIntervalsCount>
<ForecastStartDate xmlns="http://base.datacontract">2021-10-08T13:35:55.912612</ForecastStartDate>
<ForecastEndDate xmlns="http://base.datacontract">2021-10-08T13:35:55.9126123</ForecastEndDate>
<PlantForecastIntervals xmlns="http://base.datacontract">
<PlantForecastIntervalNode>
<IntervalStartTime>2021-10-01T00:00:00</IntervalStartTime>
<IntervalEndTime>2021-10-01T00:15:00</IntervalEndTime>
<IntervalLength>15</IntervalLength>
<ForecastResultParameter>FourMonthsAhead1</ForecastResultParameter>
<ForecastValue>0</ForecastValue>
<ValueUnit>MW</ValueUnit>
</PlantForecastIntervalNode>
<PlantForecastIntervalNode>
<IntervalStartTime>2021-10-01T00:15:00</IntervalStartTime>
<IntervalEndTime>2021-10-01T00:30:00</IntervalEndTime>
<IntervalLength>15</IntervalLength>
<ForecastResultParameter>FourMonthsAhead1</ForecastResultParameter>
<ForecastValue>0</ForecastValue>
<ValueUnit>MW</ValueUnit>
</PlantForecastIntervalNode>
</PlantForecastIntervals>
</FourMonthsAhead1Result>
</FourMonthsAhead1Response>
</s:Body>
</s:Envelope>
Update
After exploring other threads on StackOverflow I come up with this line below but receive another error of System.UriFormatException: 'Invalid URI: The Uri string is too long.':
XDocument xdoc = XDocument.Load(soapmessage);
var ids = xdoc.Element("FourMonthsAhead1Result")
.Elements("PlantForecastIntervals")
.Elements("<PlantForecastIntervalNode>")
.Select(item => item.Element("IntervalStartTime").Value);
Console.WriteLine(ids);

Try this using LINQ
var response = File.ReadAllText("XMLFile1.xml");
var xe = XElement.Parse(response);
XNamespace ns = "http://base.datacontract";
var obj = xe.Descendants(ns + "PlantForecastIntervals")
.Descendants(ns + "PlantForecastIntervalNode")
.Select(x => x.Element(ns + "IntervalStartTime").Value);
Console.WriteLine(obj);

Look at below solution,
var xmlRead = File.ReadAllText(#"XMLFile1.xml"); /// Add your xml file path
var xElement = XElement.Parse(xmlRead);
XNamespace xNamespace = "http://base.datacontract";
var obj = xElement.Descendants(xNamespace + "PlantForecastIntervals")
.Descendants(xNamespace + "PlantForecastIntervalNode")
.Select(x => x.Element(xNamespace + "IntervalStartTime").Value);
string[] dateTime = obj.ToArray();
foreach (string x in dateTime)
{
Console.WriteLine(x.ToString()); /// it will print time from all IntervalStartTime tags
}

Update XML file with C#

I have a xml file:
<?xml version="1.0" encoding="utf-8"?>
<ApplicationConfiguration xmlns="http://test.org/SDK/Configuration.xsd">
<ApplicationName>
<ApplicationUri>123</ApplicationUri>
<ApplicationUri>456</ApplicationUri>
</ApplicationName>
</ApplicationConfiguration>
What I want is set the value of ApplicationUri from 456 to 789 in C# code.
I wrote this code:
string docaddress = "testfile.xml";
XDocument doc = XDocument.Load(docaddress);
doc.Element("ApplicationConfiguration")
.Elements("ApplicationName").FirstOrDefault()
.SetElementValue("ApplicationUri", "789");
doc.Save(docaddress);
The problems are:
There is no error while running. I think the element ApplicationConfiguration is not correct. But when I delete the line xmlns=... from the xml file, it runs normally
The value 789 is replaced with 123, but not 456 as I want (same element name)
Can you tell me how to fix those problems?

Hello and welcome to Stack Overflow!
The xmlns attribute on the ApplicationConfiguration element makes that the root.
So you get the root first. Then you replace the values of each descendant, selecting locally by name with the element name you want. something like this:
string docaddress = "C:\\temp\\testfile.xml";
XDocument doc = XDocument.Load(docaddress);
var root = doc.Root;
var descendants = root.Descendants();
var these = root.Descendants().Where(p => p.Name.LocalName == "ApplicationUri");
foreach (var elem in these)
{
elem.Value = "789";
}
doc.Save(docaddress);

I added namespace to your code :
string docaddress = "testfile.xml";
XDocument doc = XDocument.Load(docaddress);
XNamespace ns = doc.Root.GetDefaultNamespace();
doc.Element(ns + "ApplicationConfiguration")
.Elements(ns + "ApplicationName").FirstOrDefault()
.SetElementValue(ns + "ApplicationUri", "789");
doc.Save(docaddress);

IMHO, here is an easiest method.
It is taking care of the XML default namespace.
No loops. Set based approach.
c#
void Main()
{
const string fileName = #"e:\temp\hala.xml";
const string searchFor = "456";
const string replaceWith = "789";
XDocument doc = XDocument.Load(fileName);
XNamespace ns = doc.Root.GetDefaultNamespace();
// step #1: find element based on the search value
XElement xmlFragment = doc.Descendants(ns + "ApplicationUri")
.Where(d => d.Value.Equals(searchFor)).FirstOrDefault();
// step #2: if found, set its value
if(xmlFragment != null)
xmlFragment.SetValue(replaceWith);
doc.Save(fileName);
}

How to update an XML node with LINQ?

How do we update the a node name with a new value using LINQ?
<test xmlns="http://www.mydomain.com/test/xyz" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0">
<Ribbon1>test</Ribbon1>
<Ribbon2>test</Ribbon2>
</test>
I was trying as below:
var query = from lst in XElement.Load(fileLoc).Elements(ns + "Ribbon1")
select lst.FirstNode ;
The below code is working now:
XNamespace ns = #"http://www.mydomain.com/test/xyz";
XElement xElement = XElement.Load(fileLoc);
foreach (XElement descendant in xElement.Descendants(ns + "Ribbon1"))
descendant.Value = "Borra";
xElement.Save(fileLoc);

Your code use Elemnts and that only looks at the given level. To find something at an arbitrary level:
//XElement.Load(fileLoc).Elements(ns + "Ribbon1")
XElement.Load(fileLoc).Descendants(ns + "Ribbon1")
or to adhere to the structure:
XElement.Load(fileLoc).Element(ns + "test").Elements(ns + "Ribbon1")
be careful about Element() and Elements()

XNamespace ns = #"http://www.mydomain.com/test/xyz";
XElement xElement = XElement.Load(fileLoc);
foreach (XElement descendant in xElement.Descendants(ns + "Ribbon1"))
descendant.Value = "Borra";
xElement.Save(fileLoc);

Access all nodes in xml using linq

I have xml:
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<UpdateMemberHireStatus xmlns="http://tempuri.org/">
<member>
<HireAvailability>
<code>1</code>
<name>פנוי</name>
</HireAvailability>
<HireRejectReason>
<code>2</code>
<name>wow</name>
</HireRejectReason>
<IdNumber>43504349</IdNumber>
<note> </note>
</member>
</UpdateMemberHireStatus>
and I want to use LINQ to access all the nodes in the xml.
Here's what I have tried:
XNamespace ns = "tempuri.org/";
IEnumerable<HireStatus> status = from r in doc.Descendants(ns + "UpdateMemberHireStatus")
.Descendants(ns + "member")
select new HireStatus() { };
return status.ToList();

Use Descendants
var xml = XDocument.Load(XMLStream);
var allEle = xml.Descendants("UpdateMemberHireStatus"); //you can do linq now.

You can use XDocument also in the following way:
string xmlPath = "D://member.xml";
XmlDocument doc = new XmlDocument();
xdoc = XDocument.Load(xmlPath);
doc.LoadXml(xdoc.ToString());
var memberStatus= (from mem in xdoc.Descendants("member")
select mem);
foreach (XElement element in memberStatuses.ToList())
IEnumerable<XNode> nodes = element.Nodes();

var x = XElement.Load(XMLStream);
var all = x.DescendantNodes();

Read a XML (from a string) and get some fields - Problems reading XML

I have this XML (stored in a C# string called myXML)
<?xml version="1.0" encoding="utf-16"?>
<myDataz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<listS>
<sog>
<field1>123</field1>
<field2>a</field2>
<field3>b</field3>
</sog>
<sog>
<field1>456</field1>
<field2>c</field2>
<field3>d</field3>
</sog>
</listS>
</myDataz>
and I'd like to browse all <sog> elements. For each of them, I'd like to print the child <field1>.
So this is my code :
XmlDocument xmlDoc = new XmlDocument();
string myXML = "<?xml version=\"1.0\" encoding=\"utf-16\"?><myDataz xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"><listS><sog><field1>123</field1><field2>a</field2><field3>b</field3></sog><sog><field1>456</field1><field2>c</field2><field3>d</field3></sog></listS></myDataz>"
xmlDoc.Load(myXML);
XmlNodeList parentNode = xmlDoc.GetElementsByTagName("listS");
foreach (XmlNode childrenNode in parentNode)
{
HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("//field1").Value);
}
but seems I can't read a string as XML? I get System.ArgumentException

You should use LoadXml method, not Load:
xmlDoc.LoadXml(myXML);
Load method is trying to load xml from a file and LoadXml from a string. You could also use XPath:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);
string xpath = "myDataz/listS/sog";
var nodes = xmlDoc.SelectNodes(xpath);
foreach (XmlNode childrenNode in nodes)
{
HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("//field1").Value);
}

Use Linq-XML,
XDocument doc = XDocument.Load(file);
var result = from ele in doc.Descendants("sog")
select new
{
field1 = (string)ele.Element("field1")
};
foreach (var t in result)
{
HttpContext.Current.Response.Write(t.field1);
}
OR : Get the node list of <sog> tag.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(myXML);
XmlNodeList parentNode = xmlDoc.GetElementsByTagName("sog");
foreach (XmlNode childrenNode in parentNode)
{
HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("field1").InnerText);
}

The other answers are several years old (and do not work for Windows Phone 8.1) so I figured I'd drop in another option. I used this to parse an RSS response for a Windows Phone app:
XDocument xdoc = new XDocument();
xdoc = XDocument.Parse(xml_string);

Or use the XmlSerializer class.
XmlSerializer xs = new XmlSerializer(objectType);
obj = xs.Deserialize(new StringReader(yourXmlString));

I used the System.Xml.Linq.XElement for the purpose. Just check code below for reading the value of first child node of the xml(not the root node).
string textXml = "<xmlroot><firstchild>value of first child</firstchild>........</xmlroot>";
XElement xmlroot = XElement.Parse(textXml);
string firstNodeContent = ((System.Xml.Linq.XElement)(xmlroot.FirstNode)).Value;