How can I write specific values to my loaded xml? For instance, I want the value of OriginSource to change for PreferenceID 3. What's the most efficient way to do that?
This is a short sample of what I'm trying to do.
XmlDocument doc = new XmlDocument();
XmlElement el = (XmlElement)doc.AppendChild(doc.CreateElement("UserObject"));
XmlNode emailAddressXml = UserEmailAddressDTO.AppendChild(doc.CreateNode(XmlNodeType.Element, "EmailAddress", null));
emailAddressXml.InnerText = emailaddress;
doc.Load("Prefs.xml");
XmlNode SourceXml = UserEmailAddressDTO.AppendChild(doc.CreateNode(XmlNodeType.Element, "Source", null));
originSourceXml.InnerXml = "Good Sam";
string usrObj = doc.outerXml;
Efficiency is subjective so I will provide my recommendation. Depending on .Net version (3.5+ I believe) you should employ Linq2Xml.
XDocument, XElement, and XAttribute are very easy to work with.
var doc = XDocument.Load("Prefs.xml");
var prefs = doc.Root.Descendents("UserEmailAddressPreferences");
Now you can iterate each XElement within the prefs using Linq. Retrieving and editing values is easy enough:
// untested code
XElement el = prefs.Elements().Where(e => e.Element("PreferenceID").Value == 3)
.Select(e => e.Element("OriginSource")
.FirstOrDefault();
el.Value = "Something else":
Related
I have the following XML File. I want to copy a new "Test" and change the ID of the Test. How is it possible?
I already can copy the nodes, unfortunately not on the correct position (see images) and I also can´t change the ID.
Anyone have a solution for me?
Before:
After:
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(Before.xml");
XmlNode Set = xmldoc.DocumentElement;
string strXmlQuery = "/Toolings/Testing/Test1";
XmlNode NodeToCopy = Set.SelectSingleNode(strXmlQuery);
XmlNode NewNode = NodeToCopy.CloneNode(true);
NodeToCopy.AppendChild(NewNode);
Set.InsertAfter(NewNode, Set.LastChild);
XPathNavigator navigator = xmldoc.CreateNavigator();
navigator.MoveToRoot();
navigator.MoveToFirstChild();
navigator.MoveToFirstChild();
navigator.MoveToFirstChild();
navigator.MoveToFirstChild();
navigator.SetValue("5678");
xmldoc.Save(After.xml");
Here is an example using System.Xml.Linq.XDocument which is a much easier API than XmlDocument:
//You can also use Load(), this is just so I didn't have to make a file
XDocument doc = XDocument.Parse("<Toolings><Testing><Test><ID>1234</ID></Test></Testing></Toolings>");
//Grab the first Test node (change the predicate if you have other search criteria)
var elTest = doc.Descendants().First(d => d.Name == "Test");
//Copy the node, only necessary if you don't know the structure at design time
XElement el = new XElement(elTest);
el.Element("ID").Value = "5678";
//inject new node
elTest.AddAfterSelf(el);
doc.Save("After.xml");
I'm open to all suggestions, but prefer no looping if possible. I'm trying to get the num-found attribute from this XML into a variable, but it's coming back NULL and I can't figure out why:
xmlStringGoesHere is this below:
Code:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlStringGoesHere);
int intNumFound = Convert.ToInt32(xmlDoc.SelectSingleNode("/orcid-message/orcid-search-results/#num-found").Value);
I'd like to use SelectSingleNode since it's one line of code. Someone suggested doing this below, but neither one of these work. Furthermore, is there a way to do this without all the "local-name" crap bloating up the code?
object intNumFound = xmlDoc.SelectSingleNode("/*[local-name() = 'orcid-message']/*[local-name() = 'orcid-search-results']");
object intNumFound = xmlDoc.SelectSingleNode("/*[local-name() = 'orcid-message']/*[local-name() = 'orcid-search-results']/#num-found]");
The problem is there are no elements named orcid-message or orcid-search-results; the xmlns in the XML makes it so you have to qualify those names. Here's how you include namespaces in your query:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlStringGoesHere);
var nsMgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsMgr.AddNamespace("o", "http://www.orcid.org/ns/orcid");
var attribute = xmlDoc.SelectSingleNode(
"/o:orcid-message/o:orcid-search-results/#num-found",
nsMgr);
int intNumFound = Convert.ToInt32(attribute.Value);
This seems to work:
XDocument xdoc = XDocument.Parse(xmlStringGoesHere);
int num = Int32.Parse(xdoc.Root.Elements().Where(p => p.Name.LocalName == "orcid-search-results").Attributes().Where(a => a.Name.LocalName == "num-found").First<XAttribute>().Value);
I'm trying to replace a node's name but I'm getting the following error "The reference node is not a child of this node". I think I know why this is happening but can't seem to work around this problem. Here is the XML:
<payload:Query1 xmlns="" xmlns:payload="" xmlns:xsi="" xsi:schemaLocation="">
<payload:QueryId>stuff</payload:QueryId>
<payload:Data>more stuff</payload:Data>
</payload:Query1>
And here is the C# bit:
doc.Load(readStream);
nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("payload", "location");
XmlNode Query1 = doc.SelectSingleNode("//payload:Query1", nsmgr);
public XmlDocument sendReply(args)
{
XmlNode newNode = doc.CreateElement("payload:EditedQuery");
Query.InsertBefore(newNode, Query1);
Query.RemoveChild(Query1);
return doc;
}
I'm trying to replace "Query" with "EditedQuery" but his doesn't work.
If you can use .Net 3.5 LINQ to XML,
XElement root = XElement.Load(readStream);
XNamespace ns = "http://somewhere.com";
XElement Query1 = root.Descendants(ns + "Query1").FirstOrDefault();
// should check for null first on Query1...
Query1.ReplaceWith(new XElement(ns + "EditedQuery"));
Or, if you don't know the namespace, or don't want to hard-code it:
XElement root = XElement.Load(readStream);
XElement Query1 = root.Descendants()
.FirstOrDefault(x => x.Name.Localname == "Query1");
// should check for null first on Query1...
Query1.ReplaceWith(new XElement(Query1.Name.Namespace + "EditedQuery"));
See Jon Skeet's reason why to use LINQ to XML here over older API's.
I am recently working on a .net 2.0 project I have to read some xml files and replace certain elements value.
Wondering how you do it the following not using linq to xml?
IEnumerable<XElement> cities= xmldoc.Descendants("City")
.Where(x => x.Value == "London");
foreach (XElement myElem in cities)
{
myElem.ReplaceWith(new XElement("City", "NewCity"));
}
or
var xElement = xdoc.Descendants("FirstName").Where(x => x.Value == "Max").First();
xElement.ReplaceWith(new XElement("FirstName", "NewValue");
Any suggestions
You can consider using XmlDocument, like this:
string xmlFile = "<xml><data<test /><test /><test /><test /></data></xml>";
var xmlDoc = new XmlDocument();
xmlDoc.Load(xmlFile);
var oNodes = xmlDoc.SelectNodes("//test");
foreach (var oNode in oNodes)
{
oNode.InnerText = "bla bla";
}
xmlDoc.Save("..path to xml file");
(In your case you can use InnerXml property of the document)
http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx
To selectNodes you should pass XPath Query, reference can be found:
http://www.w3schools.com/xpath/
Also if you XML contains namespace, you need to use XmlNamespaceManager:
http://msdn.microsoft.com/en-us/library/system.xml.xmlnamespacemanager.aspx
Otherwise xpath won't work.
You will need to use XmlDocument and query it using XPath with SelectNodes.
It will not be as nice and succint.
simple question but I've been dinking around with it for an hour and it's really starting to frustrate me. I have XML that looks like this:
<TimelineInfo>
<PreTrialEd>Not Started</PreTrialEd>
<Ambassador>Problem</Ambassador>
<PsychEval>Completed</PsychEval>
</TimelineInfo>
And all I want to do is use C# to get the string stored between <Ambassador> and </Ambassador>.
So far I have:
XmlDocument doc = new XmlDocument();
doc.Load("C:\\test.xml");
XmlNode x = doc.SelectSingleNode("/TimelineInfo/Ambassador");
which selects the note just fine, now how in the world do I get the content in there?
May I suggest having a look at LINQ-to-XML (System.Xml.Linq)?
var doc = XDocument.Load("C:\\test.xml");
string result = (string)doc.Root.Element("Ambassador");
LINQ-to-XML is much more friendly than the Xml* classes (System.Xml).
Otherwise you should be able to get the value of the element by retrieving the InnerText property.
string result = x.InnerText;
The InnerText property should work fine for you.
http://msdn.microsoft.com/en-us/library/system.xml.xmlnode.innertext.aspx
FWIW, you might consider switching API to linq-to-xml (XElement and friends) as IMHO it's a friendly, easier API to interact with.
System.Xml version (NOTE: no casting to XmlElement needed)
var xml = #"<TimelineInfo>
<PreTrialEd>Not Started</PreTrialEd>
<Ambassador>Problem</Ambassador>
<PsychEval>Completed</PsychEval>
</TimelineInfo>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
var node = doc.SelectSingleNode("/TimelineInfo/Ambassador");
Console.WriteLine(node.InnerText);
linq-to-xml version:
var xml = #"<TimelineInfo>
<PreTrialEd>Not Started</PreTrialEd>
<Ambassador>Problem</Ambassador>
<PsychEval>Completed</PsychEval>
</TimelineInfo>";
var root = XElement.Parse(xml);
string ambassador = (string)root.Element("Ambassador");
Console.WriteLine(ambassador);
XmlDocument doc = new XmlDocument();
doc.Load("C:\\test.xml");
XmlNode x = doc.SelectSingleNode("/TimelineInfo/Ambassador");
x.InnerText will return the contents
Try using Linq to XML - it provides a very easy way to query xml datasources - http://msdn.microsoft.com/en-us/library/bb387098%28v=VS.100%29.aspx