I want to remove all elements that have the same name in one go. My current method removes one at a time even if I have more than one element with the same name.
XDocument doc = XDocument.Load("D:\\test.xml");
var course = new XElement("Course",
new XAttribute("Name", cname),
new XAttribute("Code", ccode),
new XAttribute("Length", clenght));
doc.Element("Departments").Element("Department1").Add(course);
doc.Save("D:\\test.xml");
This is my current remove code:
string sss is the text a get from a textbox.
remove(string sss)
XDocument doc = XDocument.Load("D:\\test.xml");
IEnumerable<XElement> elList =
from el in doc.Descendants("Deparment1").Elements("Course")
where el.Attribute("Name").Value == sss
select el;
// this should filter elements with same name attribute value
foreach (XElement el in elList)
{
el.Remove();
doc.Save("D:\\test.xml");
}
// this should remove them all and update the xml file
#Andrei V it doesn't change if I put the doc.save outside the foreach
doc.Descendants("Deparment1").Elements("Course")
.Where(el=>el.Attribute("Name").Value == sss)
.Remove();
Related
I have an XML file that contains multiple URLs for different image file sizes, and I'm trying to get a single url to load into a picture box. My issue is that the child nodes are named similarly, and the parent nodes are named similarly as well. For example, I want to pull the first medium image (ending in SL160_.jpg). See below for XML code
<Items>
<SmallImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL._SL75_.jpg</URL>
</SmallImage>
<MediumImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL._SL160_.jpg</URL>
</MediumImage>
<LargeImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL.jpg</URL>
</LargeImage>
<MediumImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL._SL162_.jpg</URL>
</MediumImage>
<LargeImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL.jpg</URL>
</LargeImage>
</Items>
I've tried using GetElementsByTag, as well as trying to call something like doc.SelectSingleNode("LargeImage").SelectSingleNode("URL").InnerText, and GetElementByID. All of these have given me an Object set to null reference exception.
What can I do to specify that I want the url from the first found MediumImage node?
Use LinqToXMLïĵIt is rather simple
string xml = #"<Items>
<SmallImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL._SL75_.jpg</URL>
</SmallImage>
<MediumImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL.01_SL160_.jpg</URL>
</MediumImage>
<LargeImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL.jpg</URL>
</LargeImage>
<MediumImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL.02_SL162_.jpg</URL>
</MediumImage>
<LargeImage>
<URL>http://ecx.images-amazon.com/images/I/51TAL%2Bn7AqL.jpg</URL>
</LargeImage>
</Items>";
XElement root = XElement.Parse(xml);
var ele = root.Elements("MediumImage").Where(e => e.Element("URL").Value.EndsWith("SL160_.jpg")).FirstOrDefault();
Console.WriteLine(ele);
In addition to Sky Fang's answer, I think the OP wants this:
var firstMedImg = root.Elements("MediumImage").First();
var imgUrl = firstMedImg.Element("URL").Value;
XmlDocument doc = new XmlDocument();
// PATH TO YOUR DOCUMENT
doc.Load("daco.xml");
// Select LIST ALL ELEMENTS SmallImage,MediumImage,LargeImage
XmlNodeList listOfAllImageElements = doc.SelectNodes("/Items/*");
foreach (XmlNode imageElement in listOfAllImageElements)
{
// Select URL ELEMENT
XmlNode urlElement= node.SelectSingleNode("URL");
System.Console.WriteLine(urlElement.InnerText);
}
Console.ReadLine();
If you want to select multiple url's
XmlDocument doc = new XmlDocument();
// PATH TO YOUR DOCUMENT
doc.Load("daco.xml");
// Select LIST ALL ELEMENTS SmallImage,MediumImage,LargeImage
XmlNodeList listOfAllImageElements = doc.SelectNodes("/Items/*");
foreach (XmlNode imageElement in listOfAllImageElements)
{
// Select URL's ELEMENTs
XmlNodeList listOfAllUrlElements = imageElement.SelectNodes("URL");
foreach (XmlNode urlElement in listOfAllUrlElements)
{
System.Console.WriteLine(urlElement.InnerText);
}
}
Console.ReadLine();
if you have specific namespace in your xml file
XmlDocument doc = new XmlDocument();
doc.Load("doc.xml");
XmlNamespaceManager man = new XmlNamespaceManager(doc.NameTable);
// reaplace http://schemas.microsoft.com/vs/2009/dgml with your namespace
man.AddNamespace("x", "http://schemas.microsoft.com/vs/2009/dgml");
// next you have to use x: in your path like this
XmlNodeList node = doc.SelectNodes("/x:Items/x:*, man);
my xml stored in xml file which look like as below
<?xml version="1.0" encoding="utf-8"?>
<metroStyleManager>
<Style>Blue</Style>
<Theme>Dark</Theme>
<Owner>CSRAssistant.Form1, Text: CSR Assistant</Owner>
<Site>System.ComponentModel.Container+Site</Site>
<Container>System.ComponentModel.Container</Container>
</metroStyleManager>
this way i am iterating but some glitch is there
XmlReader rdr = XmlReader.Create(System.IO.Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath) + #"\Products.xml");
while (rdr.Read())
{
if (rdr.NodeType == XmlNodeType.Element)
{
string xx1= rdr.LocalName;
string xx = rdr.Value;
}
}
it is always getting empty string xx = rdr.Value;
when element is style then value should be Blue as in the file but i am getting always empty....can u say why?
another requirement is i want to iterate always within <metroStyleManager></metroStyleManager>
can anyone help for the above two points. thanks
Blue is the value of Text node, not of Element node. You either need to add another if to get value of text nodes, or you can read inner xml of current element node:
rdr.MoveToContent();
while (rdr.Read())
{
if (rdr.NodeType == XmlNodeType.Element)
{
string name = rdr.LocalName;
string value = rdr.ReadInnerXml();
}
}
You can also use Linq to Xml to get names and values of root children:
var xdoc = XDocument.Load(path_to_xml);
var query = from e in xdoc.Root.Elements()
select new {
e.Name.LocalName,
Value = (string)e
};
You can use the XmlDocument class for this.
XmlDocument doc = new XmlDocument.Load(filename);
foreach (XmlNode node in doc.ChildNodes)
{
if (node.ElementName == "metroStyleManager")
{
foreach (XmlNode subNode in node.ChildNodes)
{
string key = subNode.LocalName; // Style, Theme, etc.
string value = subNode.Value; // Blue, Dark, etc.
}
}
else
{
...
}
}
you can user XDocument xDoc = XDocument.Load(strFilePath) to load XML file.
then you can use
foreach (XElement xeNode in xDoc.Element("metroStyleManager").Elements())
{
//Check if node exist
if (!xeNode.Elements("Style").Any()
//If yes then
xeNode.Value
}
Hope it Helps...
BTW, its from System.XML.Linq.XDocument
I've tried deleting a node from my XML file 3 different ways; and each way I've come up empty. I am querying a SQL database and grabbing a filename, I want to delete the entire node were the file name in the XML document is = to the SQL database result.
I'm not sure what's wrong in my code:
Background Information
fn44 is the Filename grabbed from a SQL database (all my info is in a
SQL table, I need an XML file for use with JavaScript)
XML:
<?xml version="1.0" encoding="utf-8"?>
<xml>
<bannerMain>
<department>main</department>
<filename>resdrop.png</filename>
<title>This is a Title</title>
<text><![CDATA[caption text]]></text>
</bannerMain>
</xml>
Attempt 1 (I know that I'm not getting to the child correctly, can't seem to figure out how to fix it):
XDocument doc = XDocument.Load(Server.MapPath("~/uploads/banners.xml"));
var q = from node in doc.Descendants("bannerMain")
let fina = node.Descendants("filename")/*PROBLEM LINE*/
where fina != null && fina == myReader[0]/*Gets filename from SQL database*/
select node;
q.ToList().ForEach(x => x.Remove());
doc.Save(Server.MapPath("~/uploads/banners.xml"));
Attempt 2 (should work in my mind but doesn't)
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("~/uploads/banners.xml"));
XmlNode nodeToDelete = xmlDoc.SelectSingleNode("/xml/bannerMain[#filename="
+ fn44 + "]");
if (nodeToDelete != null)
{
nodeToDelete.ParentNode.RemoveChild(nodeToDelete);
}
xmlDoc.Save(Server.MapPath("~/uploads/banners.xml"));
Attempt 3 (similar to attempt 2)
string nodeToDelete = fn44;
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("~/uploads/banners.xml"));
XmlNode node = xmlDoc.SelectSingleNode(string.Format("//*[filename=\"{0}\"]"
, nodeToDelete));
if (node != null)
xmlDoc.SelectSingleNode("xml/bannersMain").RemoveChild(node);
xmlDoc.Save(Server.MapPath("~/uploads/banners.xml"));
I want to delete the whole node where the filename is = to the filename that is grabbed from the SQL database. Any help/resources is much appreciated.
SOLVED:
There's a few different options in the below answers that work out well.
Solution 1:
var xDoc = XDocument.Load(Server.MapPath("~/uploads/banners.xml"));
string fileName = fn44; //Use whatever value you found in SQL DB...
xDoc.Descendants("filename").Where(c => c.Value == fileName).Select(x => x.Parent).Remove();
xDoc.Save(Server.MapPath("~/uploads/banners.xml"));
Solution 2:
XDocument doc = XDocument.Load(Server.MapPath("~/uploads/banners.xml"));
var q = from node in doc.Descendants("bannerMain")
let fina = node.Element("filename")
where fina != null && fina.Value == fn44
select node;
q.Remove();
doc.Save(Server.MapPath("~/uploads/banners.xml"));
That seems to work for me:
string xmlfile = Server.MapPath("~/uploads/banners.xml");
var xDoc = XDocument.Load(xmlfile);
string fileName = "resdrop.png"; // Value from SQL DB
xDoc.Descendants("filename")
.Where(c => c.Value == fileName)
.Select(x => x.Parent)
.Remove();
xDoc.Save(xmlfile);
Your problem with attempt #1 is that you are trying to compare an IEnumerable<XElement> to your reader value, this should work (assuming each bannerMain only has a single filename element):
var q = from node in doc.Descendants("bannerMain")
let fina = node.Element("filename")//only single filename, so get just that XElement
where fina != null && fina.Value == reader[0]//assumes reader[0] is a string value
select node;
To remove them just do this:
q.Remove();
doc.Save(Server.MapPath("~/uploads/banners.xml"));
I ran this through LINQPad and after doing q.Remove();, here were the contents of doc: <xml />.
It's a little verbose but here is a non-linq snippet:
void DeleteNode(string fileName)
{
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("~/uploads/banners.xml"));
//Get all the bannerMain nodes.
XmlNodeList nodelist = doc.SelectNodes("/xml//bannerMain");
if (nodelist != null)
{
foreach (XmlNode node in nodelist)
{
//Look for then filename child. If it contains desired value
//delete the entire bannerMain node. Assumes order of child nodes
//may not be a constant.
foreach (XmlNode child in node.ChildNodes)
{
if (child.Name == "filename" && child.InnerText == name)
{
node.ParentNode.RemoveChild(node);
}
}
}
doc.Save(Server.MapPath("~/uploads/banners.xml"));
}
}
For Attempt #2, remove the # sign for the filename. The # symbol represents an Attribute, but the filename is a child-node.
If your phrase doesn't work, I'd rephrase it a little from:
"/xml/bannerMain[filename=
to
"//bannerMain[filename=
Basically what I am trying to do is remove a VSLOC from the list. I don't want to remove everything that belongs to it.
<?xml version="1.0"?>
<GarageNumbers>
<G554>
<id>G554</id>
<VSLOC>V002</VSLOC>
<VSLOC>V003</VSLOC>
<VSLOC>V002</VSLOC>
</G554>
<G566>
<id>G566</id>
<VSLOC>V002</VSLOC>
<VSLOC>V003</VSLOC>
<VSLOC>V002</VSLOC>
</G566>
<G572>
<id>G572</id>
<VSLOC>V001</VSLOC>
<VSLOC>V002</VSLOC>
</G572>
</GarageNumbers>
So, what I have setup is a combobox that I select a G# from which brings up all the VSLOC associated with it in a Listbox. What I need to do is to select a item from the list box and remove the line from the listbox and from the xml document using a button. I have all this setup but when I hit the button it deletes G554 and all the elements with in.
So if I want to select V002 from the list in G554 I want it to just remove that VSLOC with that innertext.
XmlDocument xDoc = new XmlDocument();
xDoc.Load(Application.StartupPath + "/xmlData.xml");
foreach (XmlNode xNode in xDoc.SelectNodes("GarageNumbers/G554"))
if (xNode.SelectSingleNode("VSLOC").InnerText == "V002")
xNode.ParentNode.RemoveChild(xNode);
xDoc.Save(Application.StartupPath + "/xmlData.xml");
You should be able to drill down to the desired elements then remove them. For example, assuming your XML is in an XElement, this approach would work:
string targetCategory = "G554";
string vsloc = "V002";
xml.Element(targetCategory)
.Elements("VSLOC")
.Where(e => e.Value == vsloc)
.Remove();
If you're using an XDocument then add the Root property: xml.Root
var xDoc = XDocument.Load(fname);
var node = xDoc.Descendants("VSLOC")
.Where(e => (string)e.Parent.Element("id") == "G554")
.FirstOrDefault();
if (node != null) node.Remove();
xDoc.Save(fname);
I have a DataGridView control where some values are popluted.
And also I have an xml file. The user can change the value in the Warning Column of DataGridView.And that needs to be saved in the xml file.
The below program just does the job
XDocument xdoc = XDocument.Load(filePath);
//match the record
foreach (var rule in xdoc.Descendants("Rule"))
{
foreach (var row in dgRulesMaster.Rows.Cast<DataGridViewRow>())
{
if (rule.Attribute("id").Value == row.Cells[0].Value.ToString())
{
rule.Attribute("action").Value = row.Cells[3].Value.ToString();
}
}
}
//save the record
xdoc.Save(filePath);
Matching the grid values with the XML document and for the matched values, updating the needed XML attribute.
Is there a better way to code this?
Thanks
You could do something like this:
var rules = dgRulesMaster.Rows.Cast<DataGridViewRow>()
.Select(x => new {
RuleId = x.Cells[0].Value.ToString(),
IsWarning = x.Cells[3].Value.ToString() });
var tuples = from n in xdoc.Descendants("Rule")
from r in rules
where n.Attribute("id").Value == r.RuleId
select new { Node = n, Rule = r };
foreach(var tuple in tuples)
tuple.Node.Attribute("action").Value = tuple.Rule.IsWarning;
This is basically the same, just a bit more LINQ-y. Whether or not this is "better" is debatable. One thing I removed is the conversion of IsWarning first to string, then to int and finally back to string. It now is converted to string once and left that way.
XPath allows you to target nodes in the xml with alot of power. Microsoft's example of using the XPathNavigator to modify an XML file is as follows:
XmlDocument document = new XmlDocument();
document.Load("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();
XmlNamespaceManager manager = new XmlNamespaceManager(navigator.NameTable);
manager.AddNamespace("bk", "http://www.contoso.com/books");
foreach (XPathNavigator nav in navigator.Select("//bk:price", manager))
{
if (nav.Value == "11.99")
{
nav.SetValue("12.99");
}
}
Console.WriteLine(navigator.OuterXml);
Source: http://msdn.microsoft.com/en-us/library/zx28tfx1(v=vs.80).aspx