I have one DemoQuestion.Xml,after deploying project i want to upload DemoQuestion.xml file with different Question Using USer Interface(such as Admin add New Question To test)
DemoQuestion.xml
<?xml version="1.0" encoding="UTF-8"?>
<quiz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="quiz.xsd">
<mchoice>
<question>Sum of 20 and 30?</question>
<answer>20</answer>
<answer correct="yes">50</answer>
<answer>10</answer>
<answer>11</answer>
</mchoice>
<mchoice>
</quiz>
i want to add <answer Correct="yes">This attribute in xml how to do it?
Here's a minimalistic code snippet...
string file = Server.MapPath("~/file.xml");
XmlDocument doc = new XmlDocument();
doc.Load(file);
var answers = doc.SelectNodes("//answer");
if (answers != null && answers.Count > 0)
{
XmlAttribute attr = doc.CreateAttribute("correct");
attr.Value = "yes";
answers[0].Attributes.Append(attr);
}
doc.Save(file);
All it does is load the document from a file, retrieves all answer elements and adds the "correct" attribute with the value of "yes" to the first answer found.
Hope it helps illustrate the solution
Leo
Related
How to parse the xml file?
<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>link</loc>
<lastmod>2011-08-17T08:23:17+00:00</lastmod>
</sitemap>
<sitemap>
<loc>link</loc>
<lastmod>2011-08-18T08:23:17+00:00</lastmod>
</sitemap>
</sitemapindex>
I am new to XML, I tried this, but it seems to be not working :
XmlDocument xml = new XmlDocument(); //* create an xml document object.
xml.Load("sitemap.xml");
XmlNodeList xnList = xml.SelectNodes("/sitemapindex/sitemap");
foreach (XmlNode xn in xnList)
{
String loc= xn["loc"].InnerText;
String lastmod= xn["lastmod"].InnerText;
}
The problem is that the sitemapindex element defines a default namespace. You need to specify the namespace when you select the nodes, otherwise it will not find them. For instance:
XmlDocument xml = new XmlDocument();
xml.Load("sitemap.xml");
XmlNamespaceManager manager = new XmlNamespaceManager(xml.NameTable);
manager.AddNamespace("s", "http://www.sitemaps.org/schemas/sitemap/0.9");
XmlNodeList xnList = xml.SelectNodes("/s:sitemapindex/s:sitemap", manager);
Normally speaking, when using the XmlNameSpaceManager, you could leave the prefix as an empty string to specify that you want that namespace to be the default namespace. So you would think you'd be able to do something like this:
// WON'T WORK
XmlDocument xml = new XmlDocument();
xml.Load("sitemap.xml");
XmlNamespaceManager manager = new XmlNamespaceManager(xml.NameTable);
manager.AddNamespace("", "http://www.sitemaps.org/schemas/sitemap/0.9"); //Empty prefix
XmlNodeList xnList = xml.SelectNodes("/sitemapindex/sitemap", manager); //No prefixes in XPath
However, if you try that code, you'll find that it won't find any matching nodes. The reason for this is that in XPath 1.0 (which is what XmlDocument implements), when no namespace is provided, it always uses the null namespace, not the default namespace. So, it doesn't matter if you specify a default namespace in the XmlNamespaceManager, it's not going to be used by XPath, anyway. To quote the relevant paragraph from the Official XPath Specification:
A QName in the node test is expanded into an expanded-name using the
namespace declarations from the expression context. This is the same
way expansion is done for element type names in start and end-tags
except that the default namespace declared with xmlns is not used: if
the QName does not have a prefix, then the namespace URI is null (this
is the same way attribute names are expanded). It is an error if the
QName has a prefix for which there is no namespace declaration in the
expression context.
Therefore, when the elements you are reading belong to a namespace, you can't avoid putting the namespace prefix in your XPath statements. However, if you don't want to bother putting the namespace URI in your code, you can just use the XmlDocument object to return the URI of the root element, which in this case, is what you want. For instance:
XmlDocument xml = new XmlDocument();
xml.Load("sitemap.xml");
XmlNamespaceManager manager = new XmlNamespaceManager(xml.NameTable);
manager.AddNamespace("s", xml.DocumentElement.NamespaceURI); //Using xml's properties instead of hard-coded URI
XmlNodeList xnList = xml.SelectNodes("/s:sitemapindex/s:sitemap", manager);
Sitemap has 2 sub nodes "loc" and "lastmod". The nodes that you are accessing are "name" and "url". that is why you are not getting any result. Also in your XML file the last sitemap tag is not closed properly with a corresponding Kindly try xn["loc"].InnerText and see if you get the desired result.
I would definitely use LINQ to XML instead of the older XmlDocument based XML API. You can accomplish what you are looking to do using the following code. Notice, I changed the name of the element that I am trying to get the value of to 'loc' and 'lastmod', because this is what is in your sample XML ('name' and 'url' did not exist):
XElement element = XElement.Parse(XMLFILE);
IEnumerable<XElement> list = element.Elements("sitemap");
foreach (XElement e in list)
{
String LOC= e.Element("loc").Value;
String LASTMOD = e.Element("lastmod").Value;
}
first post. I hope it meets with the rules of asking questions.
I'm in a bit of bother with an xml document (its an API returned Xml). Now it uses a multitude of internet (http based) security measures which I have worked thru and I am now able to return the the top tier of nodes that are not nested.
however there are a few nodes which are nested under these and I need to return some of these values.
I'm set on using XMLDocument to do this, and I'm not interested in using XPath.
I should also note that I'm using the .Net 4.5 environment.
Example XML
<?xml version="1.0" encoding="utf-8"?>
<results>
<Info xmlns="http://xmlns.namespace">
<title>This Title</title>
<ref>
<SetId>317</SetId>
</ref>
<source>
<name>file.xxx</name>
<type>thisType</type>
<hash>cc7b99599c1bebfc4b8f12e47aba3f76</hash>
<pers>65.97602</pers>
<time>02:20:02.8527777</time>
</source>
....... Continuation which is same as above
Ok so above is the Xml that gets returned from the API, now, I can return title node no problem. What I would also like to return is any of the node values in the Element, for example the pers node value. But I only want to return one (as there are many in the existing xml further down)
Please note that there is an xmlns in the Info node which may not be allowing me to return the values.
So here is my code
using (var response = (HttpWebResponse) request.GetResponse())
{
//Get the response stream
using (Stream stream = response.GetResponseStream())
{
if (stream != null)
{
var xDoc = new XmlDocument();
var nsm = new XmlNamespaceManager(xDoc.NameTable);
nsm.AddNamespace("ns", XmlNamespace);
//Read the response stream
using (XmlReader xmlReader = XmlReader.Create(stream))
{
// This is straight forward, we just need to read the XML document and return the bits we need.
xDoc.Load(xmlReader);
XmlElement root = xDoc.DocumentElement;
var cNodes = root.SelectNodes("/results/ns:Info", nsm);
//Create a new instance of Info so that we can store any data found in the Info Properties.
var info = new Info();
// Now we have a collection of Info objects
foreach (XmlNode node in cNodes)
{
// Do some parsing or other relevant filtering here
var title = node["title"];
if (title != null)
{
info.Title = title.InnerText;
_logger.Info("This is the title returned ############# {0}", info.Title);
}
//This is the bit that is killing me as i can't return the any values in the of the sub nodes
XmlNodeList sourceNodes = node.SelectNodes("source");
foreach (XmlNode sn in sourceNodes)
{
XmlNode source = sn.SelectSingleNode("source");
{
var pers = root["pers"];
if (pers != null) info.pers = pers.InnerText;
_logger.Info("############FPS = {0}", info.pers);
}
}
}
}
Thanks in advance for any help
So I finally figured it out.
Here is the code that gets the subnodes. Basically I wasn't using my namespace identifier or my namespace for returning subnodes within the "Source" node.
For anybody else in this situation,
When you declare your name space there are to parts to it, a namespace identifier which is anything you want it to be in my case I chose "ns" and then the actual namespace in the XML file which is prefixed by xmlns and will contain something like for example: "http://xmlns.mynamespace".
So when searching subnodes inside the top level you need to declare these namespaces for the main node of the subnode you want to get.
// get the <source> subnode using the namespace to returns all <source> values
var source = node.SelectSingleNode("ns:source", nsm);
if (source != null)
{
info.SourceType = source["type"].InnerText;
info.Pers = source["pers"].InnerText;
_logger.Info("This SourceNode is {0}", info.SourceType);
_logger.Info("This PersNode is {0}", info.FramesPerSecond);
}
I hope this helps somebody else that's chasing their tails as I have.
Thanks
So, I need to be able to parse xml files that could include namespace prefixes. I've tried doing this with a sample file and it gives me back null when trying to get a nodelist, even when I specify a node that has no attribute prefixes.
I've been trying to research this and it keeps coming back to the fact that without the namespace prefix defined, it won't work, so I've added code that I thought would do this, but it's still giving the same results. Here's some code I've added:
protected void Page_Load(object sender, EventArgs e)
{
xml.Load(Server.MapPath("~/SomeLesson/imsmanifest.xml"));
populateBaseNodes();
}
private void populateBaseNodes()
{
treeViewMenu.Nodes.Clear(); // Clear any existing items
TreeNode treenode = new TreeNode();
treenode.Text = "organizations";
XmlNodeList baseNodeList;
string xmlns = xml.DocumentElement.Attributes["xmlns"].Value;
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xml.NameTable);
nsmgr.AddNamespace("adlcp", "http://www.adlnet.org/xsd/adlcp_v1p3");
nsmgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
nsmgr.AddNamespace("imscp", "http://www.w3.org/2001/XMLSchema-instance");
nsmgr.AddNamespace("imsss", "http://www.w3.org/2001/XMLSchema-instance");
nsmgr.AddNamespace("schemaLocation", "http://www.w3.org/2001/XMLSchema-instance");
baseNodeList = xml.SelectNodes("/manifest/organizations/organization/item", nsmgr);
TextBox1.Text = baseNodeList.Count.ToString();
foreach (XmlNode xmlnode in baseNodeList)
{
TreeNode treeNodeCatalog = new TreeNode();
treeNodeCatalog.Text = xmlnode.Attributes["identifier"].Value;
treeNodeCatalog.SelectAction = TreeNodeSelectAction.Expand;
treeViewMenu.Nodes.Add(treeNodeCatalog);
}
treeViewMenu.CollapseAll();
}
(marc_s) Here's the XML in question that needs to be parsed:
<manifest identifier="Navigating_in_QuickBooks_-_Introduction_MANIFEST" version="1.3"
xmlns="http://www.imsglobal.org/xsd/imscp_v1p1"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:imscp="http://www.imsglobal.org/xsd/imscp_v1p1"
xmlns:adlcp="http://www.adlnet.org/xsd/adlcp_v1p3"
xmlns:imsss="http://www.imsglobal.org/xsd/imsss"
xsi:schemaLocation=" http://www.imsglobal.org/xsd/imscp_v1p1 imscp_v1p1.xsd
http://www.imsglobal.org/xsd/imsss imsss_v1p0.xsd
http://www.adlnet.org/xsd/adlcp_v1p3 adlcp_v1p3.xsd
http://www.adlnet.org/xsd/adlseq_v1p3 adlseq_v1p3.xsd
http://www.adlnet.org/xsd/adlnav_v1p3 adlnav_v1p3.xsd">
<metadata>
<!-- not relevant here ... -->
</metadata>
<organizations default="TOC1">
<organization identifier="TOC1">
<title>Navigating in QuickBooks - Introductory Lesson</title>
<item identifier="I_SCO0" identifierref="SCO0">
<title>Navigating in QuickBooks - Introductory Lesson</title>
</item>
</organization>
</organizations>
<resources>
<!-- not relevant here ... -->
</resources>
</manifest>
You're not showing us what your XML looks like - but two comments:
you don't need to add the xsi prefix, and I'm not sure what the schemaLocation prefix is supposed to do ....
when you've defined the schema prefixes, you also need to use those prefixes in your XPath, of course!
Again, not knowing what your XML structure looks like, I cannot really tell what you need - but something along the lines of:
baseNodeList = xml.SelectNodes("/adlcp:manifest/adlcp:organizations/adlcp:organization/imscp:item", nsmgr);
or whatever other XML namespace prefixes your source XML requires.
Update: seeing your XML makes it clearer: see the root node - it has a default XML namespace (the one with xmlns="...." and no explicit prefix):
<manifest identifier="Navigating_in_QuickBooks_-_Introduction_MANIFEST" version="1.3"
xmlns="http://www.imsglobal.org/xsd/imscp_v1p1" <=== DEFAULT namespace!!!
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:imscp="http://www.imsglobal.org/xsd/imscp_v1p1"
xmlns:adlcp="http://www.adlnet.org/xsd/adlcp_v1p3"
xmlns:imsss="http://www.imsglobal.org/xsd/imsss"
................>
That means: ALL your subsequent nodes that don't have a specific XML prefix will be in that default namespace.
Unfortunately, .NET XML parsing has problem with defining a default namespace without prefix - so my best solution is to create a namespace with a prefix for the default namespace, and then use it:
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xml.NameTable);
// add default namespace, with a prefix for .NET
nsmgr.AddNamespace("ns", "http://www.imsglobal.org/xsd/imscp_v1p1");
baseNodeList =
xml.SelectNodes("/ns:manifest/ns:organizations/ns:organization/ns:item", nsmgr);
Do you get any results now??
In the XML you posted the default namespace controlling all of the elements in your sample file is:
xmlns="http://www.imsglobal.org/xsd/imscp_v1p1"
This namespace does not define a prefix so you must add this namespace to your namespace manager using a blank prefix. I think you should be able to use this code to define the default namespace (using String.Empty to specify a blank prefix):
nsmgr.AddNamespace(String.Empty, "http://www.imsglobal.org/xsd/imscp_v1p1");
Seems like this should be easy, but I'm not finding a simple configuration setting. Basically I have a page that will be parsing xml files that may have some comment tags in them. I'm loading it as an xml doc and looping through a particular node of the document and I'm running into problems because it's counting the comment as a child node. Any way to tell asp.net not to look at comments other than writing my own check for <!-- ?
If you use XmlNode, then that has a NodeType property. Ignore the nodes where that has a value of "Comment".
An XNode has the same property.
Use XmlReaderSettings.IgnoreComments:
XmlReaderSettings readerSettings = new XmlReaderSettings();
readerSettings.IgnoreComments = true;
using (XmlReader reader = XmlReader.Create("input.xml", readerSettings))
{
XmlDocument myData = new XmlDocument();
myData.Load(reader);
// etc...
}
I need to create an xml file here
bool result= false;
How to achieve this in ASP.NET with C# syntax. result is value that I need to add in the XML file.
I need to create an XML file under a folder with contents like this
<?xml version="1.0" encoding="utf-8" ?>
<user>
<Authenticated>yes</Authenticated>
</user>
thank you
XElement xml = new XElement("user",
new XElement("Authenticated","Yes"))
);
xml.Save(savePath);
It works for .net 3 and above, but
You can use XmlDocument for later versions
XmlDocument xmlDoc = new XmlDocument();
// Write down the XML declaration
XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0","utf-8",null);
// Create the root element
XmlElement rootNode = xmlDoc.CreateElement("user");
xmlDoc.InsertBefore(xmlDeclaration, xmlDoc.DocumentElement);
xmlDoc.AppendChild(rootNode);
// Create the required nodes
XmlElement mainNode = xmlDoc.CreateElement("Authenticated");
XmlText yesText= xmlDoc.CreateTextNode("Yes");
mainNode.AppendChild(yesText);
rootNode.AppendChild(mainNode);
xmlDoc.Save(savePath);
You can use XmlWriter too as suggests #marc_s or at least you can store xml to the file like sting
using(StreamWriter sw = new StreamWriter(savePath))
{
sw.Write(string.Format("<?xml version=\"1.0\" encoding=\"utf-8\" ?>
<user><Authenticated>{0}</Authenticated></user>","Yes"));
}
How about this:
XmlTextWriter xtw = new XmlTextWriter(#"yourfilename.xml", Encoding.UTF8);
xtw.WriteProcessingInstruction("xml", "version=\"1.0\" encoding=\"utf-8\"");
xtw.WriteStartElement("user");
xtw.WriteStartElement("Authenticated");
xtw.WriteValue(result);
xtw.WriteEndElement(); // Authenticated
xtw.WriteEndElement(); // user
xtw.Flush();
xtw.Close();
Or if you prefer to build up your XML file in memory, you can also use the XmlDocument class and its methods:
// Create XmlDocument and add processing instruction
XmlDocument xdoc = new XmlDocument();
xdoc.AppendChild(xdoc.CreateProcessingInstruction("xml", "version=\"1.0\" encoding=\"utf-8\""));
// generate <user> element
XmlElement userElement = xdoc.CreateElement("user");
// create <Authenticated> subelement and set it's InnerText to the result value
XmlElement authElement = xdoc.CreateElement("Authenticated");
authElement.InnerText = result.ToString();
// add the <Authenticated> node as a child to the <user> node
userElement.AppendChild(authElement);
// add the <user> node to the XmlDocument
xdoc.AppendChild(userElement);
// save to file
xdoc.Save(#"C:\yourtargetfile.xml");
Should work on any version of the .NET framework, if you have a using System.Xml; clause at the top of your file.
Marc
If you want to generate the XML and then give the user a choice to save the XML in their workstation, check the post below. It explains that process in detail.
Generating XML in Memory Stream and download