I'm trying to extract the information from the namecheap sandbox api and can't figure out why my linq queries aren't working.
Here's a sample response.
XML
<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
<Errors />
<Warnings />
<RequestedCommand>namecheap.domains.check</RequestedCommand>
<CommandResponse>
<DomainCheckResult Domain="google.com" Available="false" />
</CommandResponse>
<Server>WEB1-SANDBOX1</Server>
<GMTTimeDifference>--4:00</GMTTimeDifference>
<ExecutionTime>0.875</ExecutionTime>
</ApiResponse>
C#
var doc = XDocument.Load(url);
var response = (
from r in doc.Root.Descendants("ApiResponse")
where 1==1
select new {
Errors = r.Element("Errors").Value,
Warnings = r.Element("Warnings").Value,
RequestedCommand = r.Element("RequestedCommand").Value,
CommandResponse = r.Element("CommandResponse").Value,
Server = r.Element("Server").Value
}
);
I've also tried this query with the same doc just to see if a simple example worked.
var test = doc.Descendants("RequestedCommand").First().Value;
But both return null. So where am I going wrong? I'll eventually need to get at the top level elements and the deeper elements within CommandResponse. Any help with that would also be appreciated.
UPDATE
As Jon's answer mentioned, it was mainly an issue with not using the namespace when referencing the various elements. Also used doc.Elements() rather then doc.Root. Descendants().
Here's an updated working version.
XNamespace ns = "http://api.namecheap.com/xml.response";
var response = (
from r in doc.Elements()
select new
{
Errors = r.Element(ns + "Errors").Value,
Warnings = r.Element(ns + "Warnings").Value,
RequestedCommand = r.Element(ns + "RequestedCommand").Value,
CommandResponse = r.Element(ns + "CommandResponse").Value,
Server = r.Element(ns + "Server").Value
}
);
The problem is that you're not using the namespace when you're looking for elements, descendants etc:
XNamespace ns = "http://api.namecheap.com/xml.response";
var doc = XDocument.Load(url);
var response = doc.Root
.Descendants(ns + "ApiResponse")
.Select(r => new {
Errors = r.Element(ns + "Errors").Value,
...
});
(Note that you never need where 1 == 1 in LINQ... I've changed this from query expression syntax as it wasn't giving you anything.)
The namespace is inherited from the <ApiResponse> element as the default namespace for all the other elements, as it's just xmlns=... rather than specifying an alias.
Also note that if you've shown us the whole XML document, then the above won't find any elements, as you're asking for ApiReponse elements below the root element, whereas it is the root element.
I just got Skeeted ;)
Here's something I did in linqpad to get you one of the elements in the XML
var myxml = #"<ApiResponse Status=""OK"" xmlns=""http://api.namecheap.com/xml.response"">
<Server>WEB1-SANDBOX1</Server>
<Errors />
<Warnings />
<RequestedCommand>namecheap.domains.check</RequestedCommand>
<CommandResponse>
<DomainCheckResult Domain=""google.com"" Available=""false"" />
</CommandResponse>
<GMTTimeDifference>--4:00</GMTTimeDifference>
<ExecutionTime>0.875</ExecutionTime>
</ApiResponse>";
//myxml.Dump();
XNamespace p = "http://api.namecheap.com/xml.response";
var doc1 = XElement.Parse(myxml);
var x = from n in doc1.Elements(p + "Server") select n;
x.First().Value.Dump();
Related
I have found quite a few instances of this type of question asked but for some reason none of the answers in all of those questions have worked for me.
The SOAP response that I get is this very simple one:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<GetDataAsStringResponse xmlns="http://tempuri.org/">
<GetDataAsStringResult>true</GetDataAsStringResult>
</GetDataAsStringResponse>
</s:Body>
</s:Envelope>
And these are all the options that I have tried in order to parse it and get to the "GetDataAsStringResult" element:
var doc = XDocument.Parse(responseString);
XNamespace xmlns = "xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\"";
XNamespace nsTempuri = "xmlns=\"http://tempuri.org/\"";
var namespacePrefix = doc.Root.GetNamespaceOfPrefix("s");
var resultElement = doc.Descendants("GetDataAsStringResult"); //yields no results
var resultElement1 = doc.Descendants(nsTempuri + "GetDataAsStringResult"); //yields no results
var resultElement2 = doc.Descendants(xmlns + "GetDataAsStringResult"); //yields no results
var resultElement3 = doc.Descendants(namespacePrefix + "GetDataAsStringResult"); //yields no results
var resultElement4 = doc.Descendants(namespacePrefix + "Body"); //Gets s:Body element with descendants
var resultElement5 = resultElement3.Descendants("GetDataAsStringResponse"); //yields no results
var resultElement6 = resultElement3.Descendants(nsTempuri + "GetDataAsStringResponse"); //yields no results
var resultElement7 = resultElement3.Descendants(namespacePrefix + "GetDataAsStringResponse"); //yields no results
var resultElement8 = resultElement4.Descendants(); //Gets IEnumerable with both GetDataAsStringResponse and GetDataAsStringResult
Based on all this experimentation I could do something like the following:
var doc = XDocument.Parse(responseString);
var namespacePrefix = doc.Root.GetNamespaceOfPrefix("s");
var dataAsStringResult = from data in doc.Descendants(namespacePrefix + "Body")
let descendats = data.Descendants()
select descendats.TakeLast(1).Single();
That looks like too many steps to get to what I need, especially when according to quite some answers in SO I should be able to do it in a much simpler fashion.
Any insights about why I am unable to get directly to the GetDataAsStringResult by using the "Descendants" method even when adding the namespace would be much appreciated.
Thank you.
After a couple of hours of going crazy it turned out to be a "you missed the semicolon" issue. The namespace object should be declared without the "xlmns=" part as follows:
XNamespace nsTempuri = "http://tempuri.org/";
By doing that then the following works:
doc.Descendants(nsTempuri + "GetDataAsStringResult");
I have this xml string:
<a:feed xmlns:a="http://www.w3.org/2005/Atom"
xmlns:os="http://a9.com/-/spec/opensearch/1.1/"
xmlns="http://schemas.zune.net/catalog/apps/2008/02">
<a:link rel="self" type="application/atom+xml" href="/docs" />
<a:updated>2014-02-12</a:updated>
<a:title type="text">Chickens</a:title>
<a:content type="html">eat 'em all</a:content>
<sortTitle>Chickens</sortTitle>
... other stuffs
<offers>
<offer>
<offerId>8977a259e5a3</offerId>
... other stuffs
<price>0</price>
... other stuffs
</offer>
</offers>
... other stuffs
</a:feed>
and want to get value of <price> but here in my codes:
XDocument doc = XDocument.Parse(xmlString);
var a = doc.Element("a");
var offers = a.Element("offers");
foreach (var offer in offers.Descendants())
{
var price = offer.Element("price");
var value = price.Value;
}
doc.Element("a"); returns null. I tried removing that line offers is also null. what is wrong in my code and how to get value of price? thanks
Here is correct way to get prices:
var xdoc = XDocument.Parse(xmlString);
XNamespace ns = xdoc.Root.GetDefaultNamespace();
var pricres = from o in xdoc.Root.Elements(ns + "offers").Elements(ns + "offer")
select (int)o.Element(ns + "price");
Keep in mind that your document have default namespace, and a is also namespace.
Get the namespace somehow, like
XNameSpace a = doc.Root.GetDefaultNamespace();
or, probably better:
XNameSpace a = doc.Root.GetNamespaceOfPrefix("a");
and then use it in your queries:
// to get <a:feed>
XElement f = doc.Element(a + "feed");
You can also set the namespace from a literal string, but then avoid var.
var xDoc = XDocument.Load(filename);
XNamespace ns = "http://schemas.zune.net/catalog/apps/2008/02";
var prices = xDoc
.Descendants(ns + "offer")
.Select(o => (decimal)o.Element(ns + "price"))
.ToList();
a is a namespace. To get the feed element try this:
XDocument doc = XDocument.Parse(xmlString);
XNamespace a = "http://www.w3.org/2005/Atom";
var feed = doc.Element(a + "feed");
I'm dealing to access an specific node from a XML Document. I realized that this one as a base namespace. Here is the example.
I'm interested to get the value of the node d:MediaUrl from all descendents node (entry). And I haven't accomplished that.
When I debug the variable iterator 'i', I can see that the XML includes the default namespace again, something like:
<entry xmlns="http://schemas.microsoft.com.ado/..."
And also I have to include the another namespace called 'd'.
What can I do to access to that particular nodes?
This is what I have.
var doc = XDocument.Parse(result);
string BASE_NS = "http://www.w3.org/2005/Atom";
string d = "http://schemas.microsoft.com/ado/2007/08/dataservices";
var query = from i in doc.Descendants(XName.Get("entry", BASE_NS))
select new Image()
{
Url = i.Element(XName.Get("MediaUrl", BASE_NS)).Value
};
var results = query.ToList();
I would suggest using XNamespace rather than XName (personal preference, mainly - as that's how I've always dealt with namespaces in LINQ to XML). To me it's less effort to set up the namespaces in advance and then use Element(NS + "element name") than to useXName.Get(though usingXName.Get` is perfectly fine if that's what you want to do.
If you want to get a all the "MediaUrl" elements for each entry, then I'd do something like this:
XNamespace d = "http://schemas.microsoft.com/ado/2007/08/dataservices";
var query = (from i in doc.Descendants(d + "MediaUrl")
select new Image()
{
Url = i.Value
}).ToList();
If you want to get only one of them, then you need to do something a little different, depending on which one you wanted to get.
For the properties MediaUrl:
XNamespace d = "http://schemas.microsoft.com/ado/2007/08/dataservices";
XNamespace m = "http://schemas.microsoft.com/ado/2007/08/dataservices/metadata";
var query = (from i in doc.Descendants(m + "properties")
select new Image()
{
Url = i.Element(d + "MediaUrl").Value
}).ToList();
For the Thumbnail MediaUrl:
XNamespace d = "http://schemas.microsoft.com/ado/2007/08/dataservices";
var query = (from i in doc.Descendants(d + "Thumbnail")
select new Image()
{
Url = i.Element(d + "MediaUrl").Value
}).ToList();
The key here is to use the namespace in conjunction with the element name in order to retrieve it.
var query = from i in doc.Descendants("{full namespace for prefix d}MediaUrl")
select new Image()
{
Url = i.Value
};
I am having a problem parsing xml that I receive from Web Service.
The xml looks very simple:
<Result xsi:schemaLocation="urn:yahoo:developer http://developer.yahooapis.com/TimeService/V1/GetTimeResponse.xsd" type="web"><Timestamp>1320677359</Timestamp></Result>
But when I try to parse it with following code I am getting no return results.
XDocument doc = XDocument.Load("http://developer.yahooapis.com/TimeService/V1/getTime?appid=StackSolution");
var datestamp = from ds in doc.Descendants("Result")
select new { currentstamp = ds.Element("Timestamp").Value };
Is there a solution or way to parse it?
Thanks you in advance
You have a couple issues: First, the Result node isn't a descendant. It's the root. Second, you ran into the most common issue when using LINQ to XML - you forgot the namespace. The following should give you what you need:
XElement doc = XElement.Load("http://developer.yahooapis.com/TimeService/V1/getTime?appid=StackSolution");
XNamespace ns = "urn:yahoo:developer";
var datestamp = from ds in doc.DescendantsAndSelf(ns + "Result")
select new { currentstamp = ds.Element(ns + "Timestamp").Value };
Note, this produces an IEnumerable. If you only want the datestamp, consider using FirstOrDefault instead. You may be able to make this simpler by just doing the following:
XElement doc = XElement.Load("http://developer.yahooapis.com/TimeService/V1/getTime?appid=StackSolution");
XNamespace ns = "urn:yahoo:developer";
var datestamp = doc.Element(ns + "Timestamp").Value;
This method avoids the namespace issue using LocalName (unqualified identifier).
var datestamp = doc.Root.Descendants().Where(c => c.Name.LocalName.Equals("Timestamp")).FirstOrDefault().FirstNode.ToString()
I get the followinng Xresponse after parsing the XML document:
<DIDL-Lite
xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/"
xmlns:dlna="urn:schemas-dlna-org:metadata-1-0/">
<item id="1182" parentID="40" restricted="1">
<title>Hot Issue</title>
</item>
As per the earlier thread, When there is a default namespace in the document, you must parse it as if it were a named namespace. For example.
XNamespace ns = "urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/";
var xDIDL = xResponse.Element(ns + "DIDL-Lite");
But in my case I have four different name space. I am not getting any results after using the following query , I am getting the response , Not Yeilding any results:
XNamespace dc = "http://purl.org/dc/elements/1.1/";
var vAudioData = from xAudioinfo in xResponse.Descendants(ns + "DIDL-lite").Elements("item")
select new RMSMedia
{
strAudioTitle = ((string)xAudioinfo.Element(dc + "title")).Trim(),
};
I have no clue whats going on as am new to it. Please help
This is because your item element is in your "ns" namespace. Use:-
XNamespace dc = "http://purl.org/dc/elements/1.1/";
XName didl = ns + "DIDL-lite";
XName item = ns + "item";
XName title = dc + "title";
var vAudioData = from xAudioinfo in xResponse.Descendants(didl).Elements(item)
select new RMSMedia
{
strAudioTitle = ((string)xAudioinfo.Element(title)).Trim(),
};
In these cases I tend to create myself a private class to hold the set of XNames I need to simplify the query code.
You are not getting any results because you are using the wrong namespace. All elements without prefix are in the namespace urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/.
Items in the namespace http://purl.org/dc/elements/1.1/ are prefixed with dc: in the xml document. The fragment does not show any items so it is hart to tell what elements you are looking for.
For example - given the following xml:
<DIDL-Lite
xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/"
xmlns:dlna="urn:schemas-dlna-org:metadata-1-0/">
<item id="1182" parentID="40" restricted="1">
<title>Hot Issue</title>
<dc:title>Purl Title</dc:title>
</item>
</DIDL-Lite>
And also given the assumption that you want to retrieve both titles the following code should yiedl the results you are looking for:
XNamespace dc= "http://purl.org/dc/elements/1.1/";
XNamespace ns = "urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/";
var result = xAudioinfo.Descendants(ns + "title"); // <title></title>
var result2 = xAudioinfo.Descendants(dc + "title"); // <dc:title></dc:title>