I have a request that returns a large xml file. I have the file in a XmlDocument type in my application. From that Doc how can I read an element like this:
<gphoto:videostatus>final</gphoto:videostatus>
I would like to pull that value final from that element. Also If i have multiple elements as well, can I pull that into a list? thanks for any advice.
If you already have an XmlDocument then you can use the function GetElementsByTagName() to create an XmlNodeList that can be accessed similar to an array.
http://msdn.microsoft.com/en-us/library/dc0c9ekk.aspx
//Create the XmlDocument.
XmlDocument doc = new XmlDocument();
doc.Load("books.xml");
//Display all the book titles.
XmlNodeList elemList = doc.GetElementsByTagName("title");
for (int i=0; i < elemList.Count; i++)
{
Console.WriteLine(elemList[i].InnerXml);
}
You can select nodes using XPath and SelectSingleNode SelectNodes. Look at http://www.codeproject.com/Articles/9494/Manipulate-XML-data-with-XPath-and-XmlDocument-C for examples. Then you can use for example InnerText to get final. Maybe you need to work with namespaces (gphoto). The //videostatus would select all videostatus elements
You can try using LINQ
XNamespace ns = XNamespace.Get(""); //use the xmnls namespace here
XElement element = XElement.Load(""); // xml file path
var result = element.Descendants(ns + "videostatus")
.Select(o =>o.Value).ToList();
foreach(var values in value)
{
}
Thanks
Deepu
Related
How can I read an XML attribute using C#'s XmlDocument?
I have an XML file which looks somewhat like this:
<?xml version="1.0" encoding="utf-8" ?>
<MyConfiguration xmlns="http://tempuri.org/myOwnSchema.xsd" SuperNumber="1" SuperString="whipcream">
<Other stuff />
</MyConfiguration>
How would I read the XML attributes SuperNumber and SuperString?
Currently I'm using XmlDocument, and I get the values in between using XmlDocument's GetElementsByTagName() and that works really well. I just can't figure out how to get the attributes?
XmlNodeList elemList = doc.GetElementsByTagName(...);
for (int i = 0; i < elemList.Count; i++)
{
string attrVal = elemList[i].Attributes["SuperString"].Value;
}
You should look into XPath. Once you start using it, you'll find its a lot more efficient and easier to code than iterating through lists. It also lets you directly get the things you want.
Then the code would be something similar to
string attrVal = doc.SelectSingleNode("/MyConfiguration/#SuperNumber").Value;
Note that XPath 3.0 became a W3C Recommendation on April 8, 2014.
You can migrate to XDocument instead of XmlDocument and then use Linq if you prefer that syntax. Something like:
var q = (from myConfig in xDoc.Elements("MyConfiguration")
select myConfig.Attribute("SuperString").Value)
.First();
I have an Xml File books.xml
<ParameterDBConfig>
<ID Definition="1" />
</ParameterDBConfig>
Program:
XmlDocument doc = new XmlDocument();
doc.Load("D:/siva/books.xml");
XmlNodeList elemList = doc.GetElementsByTagName("ID");
for (int i = 0; i < elemList.Count; i++)
{
string attrVal = elemList[i].Attributes["Definition"].Value;
}
Now, attrVal has the value of ID.
XmlDocument.Attributes perhaps? (Which has a method GetNamedItem that will presumably do what you want, although I've always just iterated the attribute collection)
Assuming your example document is in the string variable doc
> XDocument.Parse(doc).Root.Attribute("SuperNumber")
1
If your XML contains namespaces, then you can do the following in order to obtain the value of an attribute:
var xmlDoc = new XmlDocument();
// content is your XML as string
xmlDoc.LoadXml(content);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable());
// make sure the namespace identifier, URN in this case, matches what you have in your XML
nsmgr.AddNamespace("ns", "urn:oasis:names:tc:SAML:2.0:protocol");
// get the value of Destination attribute from within the Response node with a prefix who's identifier is "urn:oasis:names:tc:SAML:2.0:protocol" using XPath
var str = xmlDoc.SelectSingleNode("/ns:Response/#Destination", nsmgr);
if (str != null)
{
Console.WriteLine(str.Value);
}
More on XML namespaces here and here.
I have an xmldocument that i'm loading xml in to.
The xml looks like this:
<Table1>
<buyer_id>0</buyer_id>
<buyername>CompanyA</buyername>
<address1>123 Simpsons Dr.</address1>
<address2/>
<city>Springfield</city>
<state>ST</state>
<postalcode>12345</postalcode>
<eaddress/>
<phone/>
<fax/>
</Table1>
I'm looping through looking at each CompanyA entry and setting innertext accordingly. I'm using the following code to insert inner text into elements that meet the criteria:
XmlDocument dom = new XmlDocument();
dom.LoadXml(xmlString);
XmlNodeList elemList = dom.GetElementByTagName("Table1");
for(int i = 0; i < elemList.Count; i++)
{
if(dom.GetElementsByTagName("buyername").Item(i).InnerText.Contains("CompanyA")
{
dom.GetElementsByTagName("address1").Item(i).InnerText = "SomeInfo";
}
}
Using the above code, the value of address1(123 Simpsons Dr.) would be replaced by "SomeInfo". I would like to instead insert "SomeInfo" into the address2 element but when I try using:
dom.GetElementsByTagName("address2").Item(i).InnerText = "SomeInfo";
I get an error. I'm able to insert innertext into any element that already has a value but I cannot when the element is empty (such as <address2/>). Thoughts?
Use LINQ2XML.It's a complete replacement to other XML api's like the dirty old idiot XmlDocument
XElement doc=XElement.Load("yourXml.xml");
foreach(var elm in doc.Descendants("Table1"))
{
if(elm.Element("buyername").Value=="CompanyA")
elm.Element("address2").Value="SomeInfo";
}
doc.Save("yourXml.xml");
Check if the address2 xml tag is empty.
If yes , go to its parent and remove the tag then again add the same tag with value.
If no , assign the inner text to address2.
let me know if you need the code.
Use the SetElementValue method in LINQ to XML:
XDocument doc = XDocument.Load(FilePath); //replace with xml file path
IEnumerable<XElement> buyersList = doc.Descendants("Table1"); //get the table node.
var ele = (from buyer in buyersList
where buyer.Element("buyername").Value == "CompanyA"
select buyer).SingleOrDefault();
ele.SetElementValue("address1", "SomeInfo");
ele.SetElementValue("address2", "SomeInfo");
doc.Save(FilePath);
DEMO: http://ideone.com/Cf7YI
I need to parse the following xml code in c# using system.xml. I need a list of strings containing the content of the tags User.
<Configuration>
....
<DebugUsersMail>
<User>bob#example.com</User>
<User>lenny#example.com</User>
</DebugUsersMail>
...
</Configuration>
If you can use Linq something like this is nice and simple
XDocument xmlDoc = XDocument.Load("C:\\your_xml_file.xml");
List<string> users = xmlDoc.Descendants("User").Select(xElem => (string)xElem).ToList();
You'll need to include a reference to System.Xml.Linq in your using statements to use the XDocument object.
This does however assume that there are no other User elements in the xml file that you don't want included in the list.
If you want to be more specific you could do this
List<string> users = xmlDoc.Descendants("DebugUsersMail")
.Descendants("User").Select(xElem => (string)xElem).ToList();
I found a solution:
List<string> returnList = new List<string>();
XmlNodeList node = xmlDocument.GetElementsByTagName("DebugUsersMail");
XmlNodeList childNodes = node[0].ChildNodes;
for(int i = 0; i < childNodes.Count; i++)
{
returnList.Add(childNodes[i].InnerText);
}
return returnList;
There are tons of ways to do it in C#. You can use:
XmlDocument andthen XPath and XQuery
XDocument and Linq
XmlTextReader/SAX
Regular expressions
Deserialise the XML to objects
The route to take depends a lot of what the rest of XML looks like.
We are interested in finding maximum number of attributes a node has in a XML document. My code is below using C#:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(#"C:\ABC.xml");
XmlNode root = xmlDoc.DocumentElement;
int nodeAttrCount = 0;
foreach (XmlNode node in root)
if (nodeAttrCount < node.Attributes.Count)
nodeAttrCount = node.Attributes.Count;
We are interested is: do we have any thing better than this. Like any method or property which give us the same result or anyother option.
You can also use LINQ to XML:
XElement el = XElement.Load("MyXML.xml");
int maxAttr = el.DescendantNodesAndSelf().OfType<XElement>().Max(x => x.Attributes().Count());
The above code traverses all the xml nodes (it works with nested nodes too) and get the maximum number of attributes.
For .net 2.0:
XmlDocument doc = new XmlDocument();
doc.Load("MyXML.xml");
int max = 0;
foreach (XmlNode xmlNode in doc.SelectNodes("//*"))
if (max < node.Attributes.Count)
max = node.Attributes.Count;
This is basically the same as your solution;
the main difference is that it considers all nodes at every nesting level (using XPath navigation).
This is three lines of code for a fairly niche requirement. I wouldn't expect this to already exist in the .NET framework.
Your foreach loop looks fine. Are you sure you want to only look at the root elements, and not recurse inside the document?
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