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Iterate through sub child node in xml using C#

MY config.xml
<?xml version="1.0" standalone="yes"?>
<Config>
<GetPollingIndexDetails>
<NoRunDays>Sunday,Sunday</NoRunDays>
<Times>07:00</Times>
<Friday>Friday</Friday>
<ServiceTimerInterval>1</ServiceTimerInterval>
<RequestValueUserName>test</RequestValueUserName>
<RequestValuePassword>test</RequestValuePassword>
<NASPATH_LOC>
<NASPATH>
<NASPath>D:\NSEFiles</NASPath>
<NASUserId>abc</NASUserId>
<UserDomain>abc</UserDomain>
<NASUserPwd>abc</NASUserPwd>
<LoginType>9</LoginType>
<FileNamePattern>NCDEX_INDEX_ddMMyyyy[0-9]{6}_[0-9]{2}$</FileNamePattern>
</NASPATH>
<NASPATH>
<NASPath>D:\NSEFiles</NASPath>
<NASUserId>abc</NASUserId>
<UserDomain>abc</UserDomain>
<NASUserPwd>abc</NASUserPwd>
<LoginType>9</LoginType>
<FileNamePattern>NCDEX_INDEX_ddMMyyyy[0-9]{6}_[0-9]{2}$</FileNamePattern>
</NASPATH>
</NASPATH_LOC>
<MailFrom>nse_dev#ncdex.com</MailFrom>
<EmailToExtranet>nse_dev#ncdex.com</EmailToExtranet>
</GetPollingIndexDetails>
<FUTINDEX>
<INDEX>FUTXX</INDEX>
<DisplayName>NCDEX </DisplayName>
</FUTINDEX>
</Config>
I am trying to iterate through nodes under NASPATH_LOC for each NASPATH but struggling to even get to the first node. but I am not able to get a parent node too . it is giving null value in return. any kind of help will be grateful.
_xmlConfigPath = Convert.ToString(ConfigurationManager.AppSettings["ConfigXML"]);
XmlDocument xmlNasNode = new XmlDocument(); //added for test
xmlNasNode.Load(_xmlConfigPath);
XmlNodeList xnList = xmlNasNode.SelectNodes("/GetPollingIndexDetails/NASPATH_LOC/NASPATH");
foreach (XmlNode xn in xnList);
{
string NASPath = logwritter.GetMessage("//GetPollingIndexDetails/NASPATH_LOC/NASPATH/NASPath", _xmlConfigPath);
string NASUserId = logwritter.GetMessage("//GetPollingIndexDetails/NASPATH_LOC/NASPATH/NASUserId", _xmlConfigPath);
string UserDomain = logwritter.GetMessage("//GetPollingIndexDetails/NASPATH_LOC/NASPATH/UserDomain", _xmlConfigPath);
string NASUserPwd = logwritter.GetMessage("//GetPollingIndexDetails/NASPATH_LOC/NASPATH/NASUserPwd", _xmlConfigPath);
int LoginType = Convert.ToInt32(logwritter.GetMessage("//GetPollingIndexDetails/NASPATH_LOC/NASPATH/LoginType", _xmlConfigPath));
}

Reading XML file results in index out of range exception

Using C# I have an XML file like
<?xml version="1.0" encoding="utf-8"?>
<root>
<Account>
<name>Jani</name>
</Account>
</root>
and I also have a function to read the name node as:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("lib//user.xml");
XmlNode node;
node = xmlDoc.DocumentElement;
string name = node.Attributes[0].Value;
label1.Text = name.ToString();
but I am getting index out of range error as:
Why is this happening?

node = xmlDoc.DocumentElement;
string name = node.Attributes[0].Value;
node is your root node. Which looks like this:
<root>
How many attributes does it have? None, as it turns out. An attribute in XML is one of these bar="baz" things:
<foo bar="baz">
node.Attributes[0] refers to the first attribute. There is no first attribute, there's no second attribute -- you didn't use attributes in this XML at all. Hence, that's out of range. There's no first item in an empty collection.
What you want is an element named name, which is farther down inside your XML tree.
Probably this:
var node = xmlDoc.DocumentElement.SelectSingleNode("/root/Account/name");
And then you'll want to look at node.InnerText to get "Jani" out of it.

You are trying to read node.Attributes[0].Value but there is no attribtues in your sample XML file. Not sure of the exact syntax but it should probably be closer to node.Value

As mentioned by other answers, your current XML does not have attributes.
private void DoIt()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(#"M:\StackOverflowQuestionsAndAnswers\38924171\38924171\data.xml");
XmlNode node;
node = xmlDoc.DocumentElement;
//string name = node.Attributes[0].Value;
string name = node["Account"].InnerText;
}
If your XML did have attributes
<?xml version="1.0" encoding="utf-8"?>
<root>
<Account name="Jani" />
</root>
Then you could do this:
private void DoItAgain()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(#"M:\StackOverflowQuestionsAndAnswers\38924171\38924171\data2.xml");
XmlNode node;
node = xmlDoc.DocumentElement;
string name = node["Account"].Attributes[0].Value;
}

Xml delete node by elements value

Here is xml file:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Data>
<PageInfo>
<ID>0</ID>
<NUM>5</NUM>
<URL>er.php</URL>
</PageInfo>
<PageInfo>
<ID>1</ID>
<NUM> 12345</NUM>
<URL>/out/out.ViewFolder.php</URL>
</PageInfo>
</Data>
I have tried alot of ways (for a week now) to delete certain node (PageInfo) by element (ID,NUM,URL) in this xml file.
There are few approaches I have tried:
1st approach:
XmlDocument docc = new XmlDocument();
docc.LoadXml(AppDomain.CurrentDomain.BaseDirectory + "/WebData.xml");
XmlNode nodee = docc.SelectSingleNode("/Data/PageInfo/ID[2]");
nodee.RemoveAll();
2nd approach:
XmlDocument document = new XmlDocument();
document.Load(AppDomain.CurrentDomain.BaseDirectory + "/WebData.xml");
XmlNodeList nodes = document.DocumentElement.SelectNodes("/Data/PageInfo");
string ID, NUM, URL;
foreach (XmlNode node in nodes)
{
ID = node.SelectSingleNode("ID").InnerText;
NUM = node.SelectSingleNode("NUM").InnerText;
URL = node.SelectSingleNode("URL").InnerText;
node.RemoveAll();
Console.WriteLine(ID + " " + NUM + " " + URL + "\n");
}
1st solution does not trigger and exception but nothing happens, 2nd solution throws an exception: Data at the root level is invalid.
How one would be able to delete nodes by elements value in an xml file? (LINQ is fine)
Disclaimer: all solutions I have found on StackOverflow does not work for my certain case.

Based on the ID, please try this solution :
First approach
string xml = AppDomain.CurrentDomain.BaseDirectory + "/WebData.xml";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xml);
XmlNode t = xmlDoc.SelectSingleNode("/Data/PageInfo[ID='0']");
t.ParentNode.RemoveChild(t);
xmlDoc.Save(xml);
Second approach : Linq
XDocument xmlDoc = XDocument.Load(xml);
var pageInfo = (from xml2 in xmlDoc.Descendants("PageInfo")
where xml2.Element("ID").Value == "0"
|| xml2.Element("NUM").Value == "5"
|| xml2.Element("URL").Value == "er.php"
select xml2).FirstOrDefault();
pageInfo.Remove();
xmlDoc.Save(xml);
// output
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Data>
<PageInfo>
<ID>1</ID>
<NUM> 12345</NUM>
<URL>/out/out.ViewFolder.php</URL>
</PageInfo>
</Data>

As <Data> is an array so you can deserialize it in a classData which has List<PageInfo> so you can update your data accordingly and then serialize it back in your file.
Example:
XmlArray("Data")]
public class Data
{
[XmlArrayItem("PageInfo")]
public List<PageInfo> pageInfos = new List<PageInfo>();
}
public class PageInfo
{
public int ID;
public int NUM;
public string URL;
}
Now you can apply queries on your list and then deserialize your Data class back to file. See This Link for Serializing guide.

How to write CData in xml

i have an xml like :
<?xml version="1.0" encoding="UTF-8"?>
<entry>
<entry_id></entry_id>
<entry_status></entry_status>
</entry>
i am writing data in it like:
XmlNode xnode = xdoc.SelectSingleNode("entry/entry_status");
xnode.InnerText = "<![CDATA[ " + Convert.ToString(sqlReader["story_status"]) + " ]]>" ;
but its change "<" to "&lt" of CDATA.
Please tell me how to fill values in above xml as a CData format.
i know that we can create CDATA like :
XmlNode itemDescription = doc.CreateElement("description");
XmlCDataSection cdata = doc.CreateCDataSection("<P>hello world</P>");
itemDescription.AppendChild(cdata);
item.AppendChild(itemDescription);
but my process is to read node of xml and change its value not to append in it.
Thanks

As described here: msdn
// Create an XmlCDataSection from your document
var cdata = xdoc.CreateCDataSection(Convert.ToString(sqlReader["story_status"]));
// Append the cdata section to your node
xnode.AppendChild(cdata);

Do you really need it to be in CDATA, or do you just want to get the text in there in a way which won't require extra escaping in your code?
InnerText performs whatever escaping is required, so generally I'd just use
xnode.InnerText = Convert.ToString(sqlReader["story_status"]);
... but if you really want a CDATA node, you can create one yourself as per Nekresh's answer.

If you really need a CDATA section (see Jon's answer), you can achieve that like so:
XmlNode xnode = xdoc.SelectSingleNode("entry/entry_status");
XmlCDataSection cdata = xdoc.CreateCDataSection(Convert.ToString(sqlReader["story_status"]));
xnode.InnerXml = cdata.OuterXml;
This will replace the contents of xnode, not append to it.

Use Node.InnerXml, not Node.InnerText. Node.InnerText is automatically replacing special values. Note that if you specify with CDATA in InnerXml, then Node.InnerText is text in CDATA.
Example:
public class Test
{
public static int Main(string[] args)
{
const string xmlTxt = #"<?xml version=""1.0"" encoding=""UTF-8""?>
<entry>
<entry_id></entry_id>
<entry_status></entry_status>
</entry>";
TextReader treader = new StringReader(xmlTxt);
XmlReader xreader = XmlReader.Create(treader);
XmlDocument xdoc = new XmlDocument();
xdoc.Load(xreader);
XmlNode xnode = xdoc.SelectSingleNode("entry/entry_status");
//xnode.InnerText = "<![CDATA[something]]>";
xnode.InnerXml = "<![CDATA[something]]>";
Console.WriteLine("inner text is: " + xnode.InnerText);
xdoc.Save(Console.Out); Console.WriteLine();
return 0;
}
}
Program's output:
inner text is: something
<?xml version="1.0" encoding="ibm852"?>
<entry>
<entry_id>
</entry_id>
<entry_status><![CDATA[something]]></entry_status>
</entry>

XmlNode childNode = node.ChildNodes[0];
if (childNode is XmlCDataSection)
{
XmlCDataSection cdataSection = childNode as XmlCDataSection;
cdataSection.Value = newValue;
}

You can use writer.WriteCData(value);
where writer is XmlWriter object.

Problem in reading XML node with unknown root/parent nodes

I have been trying to read an xml file. I have to extract value of nodes "Date" and "Name", but the problem is, they might appear at any level in XML hierarchy.
So when I try with this code,
XmlDocument doc = new XmlDocument();
doc.Load("test1.xml");
XmlElement root = doc.DocumentElement;
XmlNodeList nodes = root.SelectNodes("//*");
string date;
string name;
foreach (XmlNode node in nodes)
{
date = node["date"].InnerText;
name = node["name"].InnerText;
}
and the XML file is ::
<?xml version="1.0" encoding="utf-8"?>
<root>
<child>
<name>Aravind</name>
<date>12/03/2000</date>
</child>
</root>
the above code errors out, as <name> and <date> are not immediate child Elements of root.
is it possible to assume that parent/root nodes are unknown and just with the name of the nodes, copy the values ??

Depending on the exception you are getting, this may or may not be the exact solution. However, I would definitely check that date and name exist before doing a .InnerText on them.
foreach (XmlNode node in nodes)
{
dateNode = node["date"];
if(dateNode != null)
date = dateNode.InnerText;
// etc.
}

I would read up on XPATH and XPATH for C# to do this more efficiently
http://support.microsoft.com/kb/308333
http://www.w3schools.com/XPath/xpath_syntax.asp
Here's a little method that should allow you to get the innerText easily.
function string GetElementText(string xml, string node)
{
XPathDocument doc = new XPathDocument(xml);
XPathNavigator nav = doc.CreateNavigator();
XPathExpression expr = nav.Compile("//" + node);
XPathNodeIterator iterator = nav.Select(expr);
while (iterator.MoveNext())
{
// return 1st but there could be more
return iterator.Current.Value;
}
}

Try to use LINQ:
string xml = #"<?xml version='1.0' encoding='utf-8'?>
<root>
<date>12/03/2001</date>
<child>
<name>Aravind</name>
<date>12/03/2000</date>
</child>
<name>AS-CII</name>
</root>";
XDocument doc = XDocument.Parse(xml);
foreach (var date in doc.Descendants("date"))
{
Console.WriteLine(date.Value);
}
foreach (var date in doc.Descendants("name"))
{
Console.WriteLine(date.Value);
}
Console.ReadLine();
The Descendants method allows you to get all the elements that have a specified name.