Develop Reference

Extract data from xml string

Let's say I have an xml string:
<?xml version="1.0" encoding="UTF-8"?>
<Return version="1.0">
<File>1</File>
<URL>2</URL>
<SourceUUID>1191CF90-5A32-4D29-9F90-24B2EXXXXXX0</SourceUUID>
</Return>
and I want to extract the value of SourceUUID, how?
I tried:
XDocument doc = XDocument.Parse(xmlString);
foreach (XElement element in doc.Descendants("SourceUUID"))
{
Console.WriteLine(element);
}

If all you want is the content of the SourceUUID element, and there's only going to be 1 in the XML, you can do this:
XDocument doc = XDocument.Parse(xmlString);
var value = doc.Descendants("SourceUUID").SingleOrDefault()?.Value;
If there are going to be more than one, you can do this:
var values = doc.Descendants("SourceUUID").Select(x => x.Value);
This gives you an enumerable of strings that are the text values of the elements.

Unable to use InsertAfter for XmlDocument in c#

Hi below are the XML files which is master XML
<?xml version="1.0" encoding="utf-16"?>
<Verify>
<ver>
<ECU>
<values>
</values>
</ECU>
</ver>
</Verify>
I have multiple files which are of same structure as below
<?xml version="1.0" encoding="utf-16"?>
<Verify>
<ver>
<ECU>
<values>
</values>
</ECU>
</ver>
</Verify>
I want my output as
<?xml version="1.0" encoding="utf-16"?>
<Verify>
<ver>
<ECU>
<values>
</values>
</ECU>
<ECU>
<values>
</values>
</ECU>
<ECU>
<values>
</values>
</ECU>
</ver>
</Verify>
I am using below code to read first one as master xml
and other files from xmls folder. I want to add ECU node from these files under ECU node of master file.
XmlDocument xmlMaster = new XmlDocument();
xmlMaster.Load(#"C:\MasterXMLFile.xml");
XmlElement masterRoot = xmlMaster.DocumentElement;
XmlNode masterParent = masterRoot.LastChild.LastChild;
var downloadfolder = #"C:\AllXMLs\xmls\";
string[] files = Directory.GetFiles(downloadfolder);
foreach (var xx in files)
{
XmlNode masterNode = masterRoot.LastChild.LastChild;
XmlDocument xdoc = new XmlDocument();
xdoc.Load(xx);
XmlElement root = xdoc.DocumentElement;
XmlElement tempNode = (XmlElement)root.LastChild.LastChild;
masterRoot.InsertAfter(tempNode, masterRoot.SelectSingleNode("//ECU").ParentNode);
}
xmlMaster.Save(#"C:\mergeg.xml");
I am getting error at InsertAfter statement as Object reference not set to an instance of an object.
Please suggest me any solution.

Your tempNode is from xdoc document context. You should import it to xmlMaster document context:
XmlNode importedECU = xmlMaster.ImportNode(tempNode, true);
Also instead of InsertAfter it's better to use AppendChild and append new ECU nodes as children of master ver element:
var masterVer = masterRoot.SelectSingleNode("//ver");
foreach(var file in files)
{
var xdoc = new XmlDocument();
xdoc.Load(file);
var tempNode = xdoc.DocumentElement.LastChild.LastChild;
var importedECU = xmlMaster.ImportNode(tempNode, true);
masterVer.AppendChild(importedECU);
}

Your InsertAfter should be on the parentNode of the node you want to insert after, so the parent of tempNode.

Xml parser doesn't work

<?xml version="1.0" encoding="utf-8"?>
<response list="true">
<audio>
<aid>253663595</aid>
<artist>Example</artist>
<duration>389</duration>
<lyrics_id>57485771</lyrics_id>
<genre>18</genre>
</audio>
<audio>
<aid>253663595</aid>
<artist>Example1</artist>
<duration>400</duration>
<lyrics_id>57485772</lyrics_id>
<genre>20</genre>
</audio>
</response>
Source code
XmlDocument allAudio = new XmlDocument();
allAudio.Load(#"e:\Audio.xml");
StreamWriter write_text = File.CreateText(#"e:\Audio.txt");
XmlNodeList audioNodes = allAudio.GetElementsByTagName("audio");
foreach (XmlNode audioNode in audioNodes)
{
XmlNode artistNode = audioNode["artist"];
write_text.WriteLine(String.Format("{0}", artistNode.Value));
}
write_text.Close();
Hi, I can't parse xml. I want write some node values in file, but as result I get an empty txt file.

You want: artistNode.InnerText
Not: artistNode.value

Split XML document apart creating multiple output files from repeating elements

I need to take an XML file and create multiple output xml files from the repeating nodes of the input file. The source file "AnimalBatch.xml" looks like this:
<?xml version="1.0" encoding="utf-8" ?>
<Animals>
<Animal id="1001">
<Quantity>One</Quantity>
<Adjective>Red</Adjective>
<Name>Rooster</Name>
</Animal>
<Animal id="1002">
<Quantity>Two</Quantity>
<Adjective>Stubborn</Adjective>
<Name>Donkeys</Name>
</Animal>
<Animal id="1003">
<Quantity>Three</Quantity>
<Color>Blind</Color>
<Name>Mice</Name>
</Animal>
</Animals>
The program needs to split the repeating "Animal" and produce 3 files named: Animal_1001.xml, Animal_1002.xml, and Animal_1003.xml
Each output file should contain just their respective element (which will be the root). The id attribute from AnimalsBatch.xml will supply the sequence number for the Animal_xxxx.xml filenames. The id attribute does not need to be in the output files.
Animal_1001.xml:
<?xml version="1.0" encoding="utf-8"?>
<Animal>
<Quantity>One</Quantity>
<Adjective>Red</Adjective>
<Name>Rooster</Name>
</Animal>
Animal_1002.xml
<?xml version="1.0" encoding="utf-8"?>
<Animal>
<Quantity>Two</Quantity>
<Adjective>Stubborn</Adjective>
<Name>Donkeys</Name>
</Animal>
Animal_1003.xml>
<?xml version="1.0" encoding="utf-8"?>
<Animal>
<Quantity>Three</Quantity>
<Adjective>Blind</Adjective>
<Name>Mice</Name>
</Animal>
I want to do this with XmlDocument, since it needs to be able to run on .Net 2.0.
My program looks like this:
static void Main(string[] args)
{
string strFileName;
string strSeq;
XmlDocument doc = new XmlDocument();
doc.Load("D:\\Rick\\Computer\\XML\\AnimalBatch.xml");
XmlNodeList nl = doc.DocumentElement.SelectNodes("Animal");
foreach (XmlNode n in nl)
{
strSeq = n.Attributes["id"].Value;
XmlDocument outdoc = new XmlDocument();
XmlNode rootnode = outdoc.CreateNode("element", "Animal", "");
outdoc.AppendChild(rootnode); // Put the wrapper element into outdoc
outdoc.ImportNode(n, true); // place the node n into outdoc
outdoc.AppendChild(n); // This statement errors:
// "The node to be inserted is from a different document context."
strFileName = "Animal_" + strSeq + ".xml";
outdoc.Save(Console.Out);
Console.WriteLine();
}
Console.WriteLine("END OF PROGRAM: Press <ENTER>");
Console.ReadLine();
}
I think I have 2 problems.
A) After doing the ImportNode on node n into outdoc, I call outdoc.AppendChild(n) which complains: "The node to be inserted is from a different document context." I do not know if this is a scope issue referencing node n within the ForEach loop - or if I am somehow not using ImportNode() or AppendChild properly. 2nd argument on ImportNode() is set to true, because I want the child elements of Animal (3 fields arbitrarily named Quantity, Adjective, and Name) to end up in the destination file.
B) Second problem is getting the Animal element into outdoc. I'm getting '' but I need ' ' so I can place node n inside it. I think my problem is how I am doing: outdoc.AppendChild(rootnode);
To show the xml, I'm doing: outdoc.Save(Console.Out); I do have the code to save() to an output file - which does work, as long as I can get outdoc assembled properly.
There is a similar question at: Split XML in Multiple XML files, but I don't understand the solution code yet. I think I'm pretty close on this approach, and will appreciate any help you can provide.
I'm going to be doing this same task using XmlReader, since I'm going to need to be able to handle large input files, and I understand that XmlDocument reads the whole thing in and can cause memory issues.

That's a simple method that seems what you are looking for
public void test_xml_split()
{
XmlDocument doc = new XmlDocument();
doc.Load("C:\\animals.xml");
XmlDocument newXmlDoc = null;
foreach (XmlNode animalNode in doc.SelectNodes("//Animals/Animal"))
{
newXmlDoc = new XmlDocument();
var targetNode = newXmlDoc.ImportNode(animalNode, true);
newXmlDoc.AppendChild(targetNode);
newXmlDoc.Save(Console.Out);
Console.WriteLine();
}
}

This approach seems to work without using the "var targetnode" statement. It creates an XmlNode object called targetNode from outdoc's "Animal" element in the ForEach loop. I think the main things that were problems in my original code were: A) I was getting nodelist nl incorrectly. And B) I couldn't "Import" node n, I think because it was associated specifically with doc. It had to be created as its own Node.
The problem with the prior proposed solution was the use of the "var" keyword. My program has to assume 2.0 and that came in with v3.0. I like Rogers solution, in that it is concise. For me - I wanted to do each thing as a separate statement.
static void SplitXMLDocument()
{
string strFileName;
string strSeq;
XmlDocument doc = new XmlDocument(); // The input file
doc.Load("D:\\Rick\\Computer\\XML\\AnimalBatch.xml");
XmlNodeList nl = doc.DocumentElement.SelectNodes("//Animals/Animal");
foreach (XmlNode n in nl)
{
strSeq = n.Attributes["id"].Value; // Animal nodes have an id attribute
XmlDocument outdoc = new XmlDocument(); // Create the outdoc xml document
XmlNode targetNode = outdoc.CreateElement("Animal"); // Create a separate node to hold the Animal element
targetNode = outdoc.ImportNode(n, true); // Bring over that Animal
targetNode.Attributes.RemoveAll(); // Remove the id attribute in <Animal id="1001">
outdoc.ImportNode(targetNode, true); // place the node n into outdoc
outdoc.AppendChild(targetNode); // AppendChild to make it stick
strFileName = "Animal_" + strSeq + ".xml";
outdoc.Save(Console.Out); Console.WriteLine();
outdoc.Save("D:\\Rick\\Computer\\XML\\" + strFileName);
Console.WriteLine();
}
}

child xml nodes reading issues

need help to read xml file. i have one xml file which i want to read and store in data base below is my xml code
<?xml version="1.0" encoding="UTF-8"?>
<Document>
<SctiesSttlmTxStsAdvc>
<Id>
<Id>ACK0000000000004</Id>
<CreDtTm>
<Dt>2011-08-26</Dt>
</CreDtTm>
</Id>
<TxId>
<AcctOwnrTxId>TCP-CMF001-000000004</AcctOwnrTxId>
</TxId>
<PrcgSts>
<AckdAccptd>
<NoSpcfdRsn>NORE</NoSpcfdRsn>
</AckdAccptd>
</PrcgSts>
<MsgOrgtr>
<PrtryId>
<Id>068001</Id>
<Issr>BMSC</Issr>
</PrtryId>
</MsgOrgtr>
<MsgRcpt>
<PrtryId>
<Id>056001</Id>
<Issr>BMSC</Issr>
</PrtryId>
</MsgRcpt>
</SctiesSttlmTxStsAdvc>
<SctiesSttlmTxStsAdvc>
</SctiesSttlmTxStsAdvc>
</Document>
above xml contains tags which occur multiple time and i need to find out the value of all child node which has value

I think it should get you all the child nodes from your root node
XmlDocument doc = new XmlDocument();
doc.LoadXml("nameofyourfile.xml");
XmlNode root = doc.FirstChild;
//Display the contents of the child nodes.
if (root.HasChildNodes)
{
for (int i=0; i<root.ChildNodes.Count; i++)
{
if(root.ChildNodes[i].InnerText!="")
{
Console.WriteLine(root.ChildNodes[i].InnerText);
}
}
}
}
}
you can load xm directly like this
doc.LoadXml(<Document>
<SctiesSttlmTxStsAdvc>
<Id>
<Id>ACK0000000000004</Id>
<CreDtTm>
<Dt>2011-08-26</Dt>
</CreDtTm>
</Id>
<TxId>
<AcctOwnrTxId>TCP-CMF001-000000004</AcctOwnrTxId>
</TxId>
<PrcgSts>
<AckdAccptd>
<NoSpcfdRsn>NORE</NoSpcfdRsn>
</AckdAccptd>
</PrcgSts>
<MsgOrgtr>
<PrtryId>
<Id>068001</Id>
<Issr>BMSC</Issr>
</PrtryId>
</MsgOrgtr>
<MsgRcpt>
<PrtryId>
<Id>056001</Id>
<Issr>BMSC</Issr>
</PrtryId>
</MsgRcpt>
</SctiesSttlmTxStsAdvc>
<SctiesSttlmTxStsAdvc>
</SctiesSttlmTxStsAdvc>
</Document>);