everyone!
I have an XML file and need to change the value of a node, specifically the indicated line. The problem i have is that as you can see, there are many nodes.
How can i change this line? This XML file could be much larger, so i am looking for a solution that would take different amounts of 'launch.file' nodes into account.
The node that will need to be set to True will be identified by the corresponding NAME tag. So if i typed in ULTII, the DISABLED node for that block will be set to True. If i typed in Catl, then the DISABLED node for that block would be changed.
<?xml version="1.0" encoding="windows-1252"?>
<SBase.Doc Type="Launch" version="1,0">
<Descr>Launch</Descr>
<Filename>run.xml</Filename>
<Disabled>False</Disabled>
<Launch.ManualLoad>False</Launch.ManualLoad>
<Launch.File>
<Name>Catl</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>ft\catl\catl.exe</Path>
</Launch.File>
<Launch.File>
<Disabled>False</Disabled> <!-- change to True -->
<ManualLoad>False</ManualLoad>
<Name>ULTII</Name>
<Path>F:\ULTII.exe</Path>
<NewConsole>True</NewConsole>
</Launch.File>
<Launch.File>
<Name>ECA</Name>
<Disabled>False</Disabled>
<Path>C:\ECA.exe</Path>
</Launch.File>
</SBase.Doc>
I am using Visual Studio 2012, should you need to know.
Thank you to anyone who can help me out on this, i really appreciate it.
Heres my method to do what you want
private void DisableLaunchFile(string xmlfile, string launchFileName){
XDocument doc = XDocument.Load(xmlfile);
var launchFileElement = doc.Descendants("Launch.File").Where (d => d.Element("Name").Value == lauchFileName);
launchFileElement.Elements("Disabled").First().Value = true.ToString();
doc.Save(xmlfile);
}
Use it like:
string pathToXmlFile = //assign ;
DisableLaunchFile(pathToXmlFile, "Catl");
DisableLaunchFile(pathToXmlFile, "ULTII");
This can be achieved by using LINQ to XML (see XDocument Class).
Assuming that there is the single Launch.File element with Name element with value "ULTII":
var document = XDocument.Load(...);
var ultiiElement = document
.Descendants("Launch.File")
.Single(fileElement => fileElement.Element("Name").Value == "ULTII");
ultiiElement.Element("Disabled").Value = "True"; // or true.ToString()
document.Save(...);
This method will do the trick:
public void ChangeNode(string name, string filePath)
{
XDocument xDocument;
using (var streamReader = new StreamReader(filePath))
{
xDocument = XDocument.Parse(streamReader.ReadToEnd());
}
var nodes = xDocument.Descendants("Launch.File");
foreach (var node in nodes)
{
var nameNode = node.Descendants("Name").FirstOrDefault();
if (nameNode != null && nameNode.Value == name)
{
var disabledNode = node.Descendants("Disabled").FirstOrDefault();
if (disabledNode != null)
{
disabledNode.SetValue("True");
}
}
}
using (var streamWriter = new StreamWriter(filePath))
{
xDocument.Save(streamWriter);
}
}
The name you want to pass in is the name of the node that you want to change and the path is the file path to the xml file. So you might call it like:
ChangeNode("ULTII", "C:\\output.xml");
You may need to tidy this up a bit like matching the node name invariant of case or culture but it should get you started.
Related
I am trying to figure out the code to extract xml child (I think this is worded correctly) elements. I have searched and tried many samples but cannot find how to drill down to pick out the section I want and return the information I need. Maybe I all I need is someone to define the data I am trying to pull so I can read up on the issue, of course any code would be very helpful and I will figure it out from there. Thanks in advanced for any help!
Here is the xml file. I am trying to run an if statement to find the section named <STATISTICTYPE>PVCAP_CharactersSaved</STATISTICTYPE> and return the <JOBNAME>,<TIMEDELTA>,<VALUESUM>.
<?xml version="1.0" encoding="utf-8"?>
<PVCAPTURESTATISTICCONTAINTER xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<PVCAPTUREJOBSTATISTICS>
<PVCAPTURESTATISTICSUMMARY>
<STATISTICTYPE>PVCAP_CharactersSaved</STATISTICTYPE>
<STATISTICNAME>Characters saved</STATISTICNAME>
<JOBID>24</JOBID>
<JOBNAME>HEAT FILES</JOBNAME>
<TIMEDELTA>422</TIMEDELTA>
<VALUESUM>25432</VALUESUM>
</PVCAPTURESTATISTICSUMMARY>
<PVCAPTURESTATISTICSUMMARY>
<STATISTICTYPE>PVCAP_CharactersSaved_NoMM</STATISTICTYPE>
<STATISTICNAME>Characters saved (no match and merge)</STATISTICNAME>
<JOBID>24</JOBID>
<JOBNAME>HEAT FILES</JOBNAME>
<TIMEDELTA>422</TIMEDELTA>
<VALUESUM>25432</VALUESUM>
</PVCAPTURESTATISTICSUMMARY>
</PVCAPTUREJOBSTATISTICS>
<DOCUMENTCOUNT>762</DOCUMENTCOUNT>
<PAGECOUNT>3194</PAGECOUNT>
<IMAGECOUNT>3194</IMAGECOUNT>
<VERSION>2.0</VERSION>
</PVCAPTURESTATISTICCONTAINTER>
You can use LINQ to XML, particularly the XElement class.
var element = XElement.Parse(xmlStr).Element("PVCAPTUREJOBSTATISTICS")
.Elements("PVCAPTURESTATISTICSUMMARY")
.First(c => c.Element("STATISTICTYPE").Value == "PVCAP_CharactersSaved")
var jobName = element.Element("JOBNAME").Value;
var timeDelta = element.Element("TIMEDELTA").Value;
var valueSum = element.Element("VALUESUM").Value;
You'll want to add in some error handling and whatnot here, but this should get you going in the right direction.
You can do something like this:
XElement res = XElement.Parse(xmlResult);
foreach(var elem in res.Element("PVCAPTUREJOBSTATISTICS").Elements("PVCAPTURESTATISTICSUMMARY"))
{
if (elem.Element("STATISTICTYPE").Value.Equals("PVCAP_CharactersSaved", StringComparison.Ordinal))
{
string jobName = elem.Element("JOBNAME").Value;
string timeDelta = elem.Element("TIMEDELTA").Value;
string valueSum = elem.Element("VALUESUM").Value;
}
}
You can use XDocument and LINQ-to-XML to do that quite easily, for example :
string xml = "your xml content here";
XDocument doc = XDocument.Parse(xml);
//or if you have the xml file instead :
//XDocument doc = XDocument.Load("path_to_xml_file.xml");
var result = doc.Descendants("PVCAPTURESTATISTICSUMMARY")
.Where(o => (string) o.Element("STATISTICTYPE") == "PVCAP_CharactersSaved")
.Select(o => new
{
jobname = (string) o.Element("JOBNAME"),
timedelta = (string) o.Element("TIMEDELTA"),
valuesum = (string) o.Element("VALUESUM")
});
foreach (var r in result)
{
Console.WriteLine(r);
}
I have an XML string that is loaded into an XMLDocument, similar to the one listed below:
<note>
<to>You</to>
<from>Me</from>
<heading>TEST</heading>
<body>This is a test.</body>
</note>
I would like to convert the text nodes to attributes (using C#), so it looks like this:
<note to="You" from="Me" heading="TEST" body="This is a test." />
Any info would be greatly appreciated.
Linq to XML is great for this kind of stuff. You could probably achieve it in one line if you'd want to. Just grab the child node names and their respective value and add all those 'key value pairs' as attributes instead.
MSDN docs here: http://msdn.microsoft.com/en-us/library/bb387098.aspx
Like seldon suggests, LINQ to XML would be a much better fit for this sort of task.
But here's a way to do it with XmlDocument. Not claiming this is fool-proof (haven't tested it), but it does seem to work for your sample.
XmlDocument input = ...
// Create output document.
XmlDocument output = new XmlDocument();
// Create output root element: <note>...</note>
var root = output.CreateElement(input.DocumentElement.Name);
// Append attributes to the output root element
// from elements of the input document.
foreach (var child in input.DocumentElement.ChildNodes.OfType<XmlElement>())
{
var attribute = output.CreateAttribute(child.Name); // to
attribute.Value = child.InnerXml; // to = "You"
root.Attributes.Append(attribute); // <note to = "You">
}
// Make <note> the root element of the output document.
output.AppendChild(root);
Following converts any simple XML leaf node into an attribute of its parent. It is implemented as a unit test. Encapsulate your XML content into an input.xml file, and check it saved as output.xml.
using System;
using System.Xml;
using System.Linq;
using NUnit.Framework;
[TestFixture]
public class XmlConvert
{
[TestCase("input.xml", "output.xml")]
public void LeafsToAttributes(string inputxml, string outputxml)
{
var doc = new XmlDocument();
doc.Load(inputxml);
ParseLeafs(doc.DocumentElement);
doc.Save(outputxml);
}
private void ParseLeafs(XmlNode parent)
{
var children = parent.ChildNodes.Cast<XmlNode>().ToArray();
foreach (XmlNode child in children)
if (child.NodeType == XmlNodeType.Element
&& child.Attributes.Count == 0
&& child.ChildNodes.Count == 1
&& child.ChildNodes[0].NodeType == XmlNodeType.Text
&& parent.Attributes[child.Name] == null)
{
AddAttribute(parent, child.Name, child.InnerXml);
parent.RemoveChild(child);
}
else ParseLeafs(child);
// show no closing tag, if not necessary
if (parent.NodeType == XmlNodeType.Element
&& parent.ChildNodes.Count == 0)
(parent as XmlElement).IsEmpty = true;
}
private XmlAttribute AddAttribute(XmlNode node, string name, string value)
{
var attr = node.OwnerDocument.CreateAttribute(name);
attr.Value = value;
node.Attributes.Append(attr);
return attr;
}
}
Here is my XML file
<?xml version="1.0" encoding="utf-8" ?>
<storage>
<Save Name ="Lifeline">
<Seconds>12</Seconds>
<Minutes>24</Minutes>
<Hours>9</Hours>
<Days>25</Days>
<Months>8</Months>
<Years>2010</Years>
<Health>90</Health>
<Mood>100</Mood>
</Save>
<Save Name ="Hellcode">
<Seconds>24</Seconds>
<Minutes>48</Minutes>
<Hours>18</Hours>
<Days>15</Days>
<Months>4</Months>
<Years>1995</Years>
<Health>50</Health>
<Mood>50</Mood>
</Save>
Here is a code which get's data from XML and loads it into application.
System.IO.StreamReader sr = new System.IO.StreamReader(#"Saves.xml");
System.Xml.XmlTextReader xr = new System.Xml.XmlTextReader(sr);
System.Xml.XmlDocument save = new System.Xml.XmlDocument();
save.Load(xr);
XmlNodeList saveItems = save.SelectNodes("Storage/Save");
XmlNode seconds = saveItems.Item(0).SelectSingleNode("Seconds");
sec = Int32.Parse(seconds.InnerText);
XmlNode minutes = saveItems.Item(0).SelectSingleNode("Minutes");
min = Int32.Parse(minutes.InnerText);
XmlNode hours = saveItems.Item(0).SelectSingleNode("Hours");
hour = Int32.Parse(hours.InnerText);
XmlNode days = saveItems.Item(0).SelectSingleNode("Days");
day = Int32.Parse(days.InnerText);
XmlNode months = saveItems.Item(0).SelectSingleNode("Months");
month = Int32.Parse(months.InnerText);
XmlNode years = saveItems.Item(0).SelectSingleNode("Years");
year = Int32.Parse(years.InnerText);
XmlNode health_ = saveItems.Item(0).SelectSingleNode("Health");
health = Int32.Parse(health_.InnerText);
XmlNode mood_ = saveItems.Item(0).SelectSingleNode("Mood");
mood = Int32.Parse(mood_.InnerText);
The problem is that this code loads data inly from "Lifeline" node. I would like to use a listbox and be able to choose from which node to load data.
I've tried to take string from listbox item content and then use such a line
XmlNodeList saveItems = save.SelectNodes(string.Format("storage/Save[#Name = '{0}']", name));
variable "name" is a string from listboxe's item. While compiled this code gives exception.
Do somebody knows a way how to select by attribute and load nedeed data from that XML?
If you can use XElement:
XElement xml = XElement.Load(file);
XElement storage = xml.Element("storage");
XElement save = storage.Elements("Save").FirstOrDefault(e => ((string)e.Attribute("Name")) == nameWeWant);
if(null != save)
{
// do something with it
}
Personally I like classes that have properties that convert to and from the XElement to hide that detail from the main program. IE say the Save class takes an XElement node in the constructor, saves it internally globally, and the properties read/write to it.
Example class:
public class MyClass
{
XElement self;
public MyClass(XElement self)
{
this.self = self;
}
public string Name
{
get { return (string)(self.Attribute("Name") ?? "some default value/null"); }
set
{
XAttribute x = source.Attribute("Name");
if(null == x)
source.Add(new XAttribute("Name", value));
else
x.ReplaceWith(new XAttribute("Name", value));
}
}
}
Then you can change the search to something like:
XElement save = storage.Elements("Save")
.FirstOrDefault(e => new MyClass(e).Name == NameWeWant);
Since it is not that much data, I'd suggest loading all information to a list of saves(constructor) and then drawing from there which one the user would like to use...
As for things not working, I personally use a lower level approach to get my data and it is not error prone. Remodeling it to fit your problem a bit:
int saves = 0;
List<Saves> saveGames = new List<Saves>();
saveGames.Add(new Saves());
while (textReader.Read())
{
if (textReader.NodeType == XmlNodeType.Element)
whatsNext = textReader.Name;
else if (textReader.NodeType == XmlNodeType.Text)
{
if (whatsNext == "name")
saveGames[saves].name = Convert.ToString(textReader.Value);
//else if statements for the rest of your attributes
else if (whatsNext == "Save")
{
saveGames.Add(new Saves());
saves++;
}
}
else if (textReader.NodeType == XmlNodeType.EndElement)
whatsNext = "";
}
Basically throw everything in the xml file into a list of objects and manipulate that list to fill the listbox. Instead of having Saves name = "...", have a name attribute as the first attribute in the save.
Code tags hate me. Why they break so easily ( ._.)
The select nodes is returning two XmlNode objects.
XmlNodeList saveItems = save.SelectNodes("Storage/Save");
Later in your code you seem to be selecting the first one and with saveItems.Item(0) and getting values from it which in this case would be the save node with the Name="LifeLine". So if you were to do saveItems.Item(1) and select nodes and its values then you would get the other set of nodes.
I'm trying to add all the nodes in an XML file into a listView, and I'm doing something wrong but I can't for the life of me figure it out even after looking at a load of examples. This is the XML snippet:
<queue>
<slots>
<slot>
<status>Downloading</status>
<filename>file1</filename>
<size>1 GB</size>
</slot>
<slot>
<status>Downloading</status>
<filename>file2</filename>
<size>2 GB</size>
</slot>
</slots>
</queue>
And here's the code:
XDocument xDoc = XDocument.Load(xmlFilePath);
List<Download> list = new List<Download>();
foreach (var download in xDoc.Descendants("slots"))
{
string filename = download.Element("filename").Value;
string size = download.Element("size").Value;
string status = download.Element("status").Value;
list.Add(new Download { Filename = filename, Size = size, Status = status });
}
Any help greatly appreciated as always.
EDIT: To clarify, I'm getting a NullReferenceException on
string filename = download.Element("filename").Value;
And i know the listview is missing, I've not done that bit yet :)
var list = (from download in xDoc.Descendats("slot")
select new Download
{
Filename = (string) download.Element("filename"),
Size = (string) download.Element("size"),
Status = (string) download.Element("status")
}).ToList();
This looks nicer, and since you didn't say what exactly is wrong with your code, it's about all I can do.
Update: just tested this, and it fixes your exception.
The XML in your example works fine. The NullReferenceException is happening because the real XML you're using doesn't have a filename element in one of the slots. You can use
string filename = download.Element("filename") == null ?
String.Empty : download.Element("filename").Value;
instead if there is a possible default for the filename. But more likely correctly handling this exception is better.
void LoadSlots()
{
XmlDocument doc = new XmlDocument();
doc.Load(Environment.CurrentDirectory + "\\queue.xml");
XmlNodeList nodes = doc.SelectNodes("//queue/slots/slot");
foreach (XmlNode node in nodes)
{
string filename = node.Attributes["filename"].InnerText;
string size = node.Attributes["size"].InnerText;
string status = node.Attributes["status"].InnerText;
_slots.Add(filename, size, status);
}
}
I have several XML files that I wish to read attributes from. My main objective is to apply syntax highlighting to rich text box.
For example in one of my XML docs I have: <Keyword name="using">[..] All the files have the same element: Keyword.
So, how can I get the value for the attribute name and put them in a collection of strings for each XML file.
I am using Visual C# 2008.
The other answers will do the job - but the syntax highlighting thingy and the several xml files you say you have makes me thinks you need something faster, why not use a lean and mean XmlReader?
private string[] getNames(string fileName)
{
XmlReader xmlReader = XmlReader.Create(fileName);
List<string> names = new List<string>();
while (xmlReader.Read())
{
//keep reading until we see your element
if (xmlReader.Name.Equals("Keyword") && (xmlReader.NodeType == XmlNodeType.Element))
{
// get attribute from the Xml element here
string name = xmlReader.GetAttribute("name");
// --> now **add to collection** - or whatever
names.Add(name);
}
}
return names.ToArray();
}
Another good option would be the XPathNavigator class - which is faster than XmlDoc and you can use XPath.
Also I would suggest to go with this approach only IFF after you try with the straightforward options you're not happy with performance.
You could use XPath to get all the elements, then a LINQ query to get the values on all the name atttributes you find:
XDocument doc = yourDocument;
var nodes = from element in doc.XPathSelectElements("//Keyword")
let att = element.Attribute("name")
where att != null
select att.Value;
string[] names = nodes.ToArray();
The //Keyword XPath expression means, "all elements in the document, named "Keyword".
Edit: Just saw that you only want elements named Keyword. Updated the code sample.
Like others, I would suggest using LINQ to XML - but I don't think there's much need to use XPath here. Here's a simple method to return all the keyword names within a file:
static IEnumerable<string> GetKeywordNames(string file)
{
return XDocument.Load(file)
.Descendants("Keyword")
.Attributes("name")
.Select(attr => attr.Value);
}
Nice and declarative :)
Note that if you're going to want to use the result more than once, you should call ToList() or ToArray() on it, otherwise it'll reload the file each time. Of course you could change the method to return List<string> or string[] by -adding the relevant call to the end of the chain of method calls, e.g.
static List<string> GetKeywordNames(string file)
{
return XDocument.Load(file)
.Descendants("Keyword")
.Attributes("name")
.Select(attr => attr.Value)
.ToList();
}
Also note that this just gives you the names - I would have expected you to want the other details of the elements, in which case you'd probably want something slightly different. If it turns out you need more, please let us know.
You could use LINQ to XML.
Example:
var xmlFile = XDocument.Load(someFile);
var query = from item in xmlFile.Descendants("childobject")
where !String.IsNullOrEmpty(item.Attribute("using")
select new
{
AttributeValue = item.Attribute("using").Value
};
You'll likely want to use XPath. //Keyword/#name should get you all of the keyword names.
Here's a good introduction: .Net and XML XPath Queries
**<Countries>
<Country name ="ANDORRA">
<state>Andorra (general)</state>
<state>Andorra</state>
</Country>
<Country name ="United Arab Emirates">
<state>Abu Z¸aby</state>
<state>Umm al Qaywayn</state>
</Country>**
public void datass(string file)
{
string file = HttpContext.Current.Server.MapPath("~/App_Data/CS.xml");
XmlDocument doc = new XmlDocument();
if (System.IO.File.Exists(file))
{
//Load the XML File
doc.Load(file);
}
//Get the root element
XmlElement root = doc.DocumentElement;
XmlNodeList subroot = root.SelectNodes("Country");
for (int i = 0; i < subroot.Count; i++)
{
XmlNode elem = subroot.Item(i);
string attrVal = elem.Attributes["name"].Value;
Response.Write(attrVal);
XmlNodeList sub = elem.SelectNodes("state");
for (int j = 0; j < sub.Count; j++)
{
XmlNode elem1 = sub.Item(j);
Response.Write(elem1.InnerText);
}
}
}