Develop Reference

How to add XNamespace (Xml.Linq) to XElement? [duplicate]

Question update: im very sorry if my question is not clear
here is the code im using right now
XDocument doc = XDocument.Parse(framedoc.ToString());
foreach (var node in doc.Descendants("document").ToList())
{
XNamespace ns = "xsi";
node.SetAttributeValue(ns + "schema", "");
node.Name = "alto";
}
and here is the output
<alto p1:schema="" xmlns:p1="xsi">
my goal is like this
xsi:schemaLocation=""
where does the p1 and xmlns:p1="xsi" came from?

When you write
XNamespace ns = "xsi";
That's creating an XNamespace with a URI of just "xsi". That's not what you want. You want a namespace alias of xsi... with the appropriate URI via an xmlns attribute. So you want:
XDocument doc = XDocument.Parse(framedoc.ToString());
foreach (var node in doc.Descendants("document").ToList())
{
XNamespace ns = "http://www.w3.org/2001/XMLSchema-instance";
node.SetAttributeValue(XNamespace.Xmnls + "xsi", ns.NamespaceName);
node.SetAttributeValue(ns + "schema", "");
node.Name = "alto";
}
Or better, just set the alias at the root element:
XDocument doc = XDocument.Parse(framedoc.ToString());
XNamespace ns = "http://www.w3.org/2001/XMLSchema-instance";
doc.Root.SetAttributeValue(XNamespace.Xmlns + "xsi", ns.NamespaceName);
foreach (var node in doc.Descendants("document").ToList())
{
node.SetAttributeValue(ns + "schema", "");
node.Name = "alto";
}
Sample creating a document:
using System;
using System.Xml.Linq;
public class Test
{
static void Main()
{
XNamespace ns = "http://www.w3.org/2001/XMLSchema-instance";
XDocument doc = new XDocument(
new XElement("root",
new XAttribute(XNamespace.Xmlns + "xsi", ns.NamespaceName),
new XElement("element1", new XAttribute(ns + "schema", "s1")),
new XElement("element2", new XAttribute(ns + "schema", "s2"))
)
);
Console.WriteLine(doc);
}
}
Output:
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<element1 xsi:schema="s1" />
<element2 xsi:schema="s2" />
</root>

Namespace with colon as attribute of xml file in C#

I want to generate a xml code like below example:-
<?xml version="1.0" encoding="utf-8"?>
<Root xmlns ="abc.xyz.xsd" xmlns:xsi="http://namespace">
</Root>
My C# code is like below:
XNamespace xsi = "http://namespace";
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", null),
new XElement("Root",
new XAttribute("xmlns", "abc.xyz.xsd"),
new XAttribute(XNamespace.Xmlns + "xsi", xsi)
);
This code gives error while saving. What am I doing wrong?

You can use with single namespace
XNamespace xsi = "http://namespace";
XDocument doc1 = new XDocument(
new XDeclaration("1.0", "utf-8", null),
new XElement(xsi + "Root",
new XAttribute("xmlns", "abc.xyz.xsd"),
new XAttribute(XNamespace.Xmlns + "xsi", "http://namespace"),
new XElement(xsi + "Child",
new XElement(xsi + "DifferentChild", "other content")
)
));
See this for reference https://msdn.microsoft.com/en-us/library/bb387075.aspx
The output will look like this
<?xml version="1.0" encoding="utf-8"?>
<xsi:Root xmlns="abc.xyz.xsd" xmlns:xsi="http://namespace">
<xsi:Child>
<xsi:DifferentChild>other content</xsi:DifferentChild>
</xsi:Child>
</xsi:Root>

You should add your Root element with namespace (namespace + "Root") since you're using namespaces.
Like this:
XNamespace xsi = "http://namespace";
XNamespace ns = "abc.xyz.xsd";
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", null),
new XElement(ns + "Root",
new XAttribute("xmlns", ns),
new XAttribute(XNamespace.Xmlns + "xsi", xsi)));
See MSDN article concerning creation of documents having namespaces.

Error: Cannot redefine the namespace for prefix '' used at current element

I am sending a soap request in Xamarin using Linq. I keep getting the error. I know its coming from
this line:
(new XElement ("Subscribe",
new XAttribute ("xmlns", "eAuthService"),
Any help would be greatly appreciated. I have tried everything.
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
XNamespace xsd = "http://www.w3.org/2001/XMLSchema";
XNamespace soap12 = "http://www.w3.org/2003/05/soap-envelope";
XNamespace eauth = "eAuthService";
XName xmlns = "xmlns";
XDocument xDoc = new XDocument (
new XElement (soap12 + "Envelope",
new XAttribute (XNamespace.Xmlns + "xsi", xsi),
new XAttribute (XNamespace.Xmlns + "xsd", xsd),
new XAttribute (XNamespace.Xmlns + "soap12", soap12),
new XElement (soap12 + "Body",
(new XElement ("Subscribe",
new XAttribute ("xmlns", "eAuthService"),
(new XElement ("RequestSubscription",
(new XElement ("Token", "Subscription")),
(new XElement ("ID_Subscription", myResources.registerationId)),
(new XElement ("DateOfBirth", main.pickDate.Text)),
(new XElement ("CountryCode3Letter", "IND")))))))));

It's failing because you're redefining the default namespace (no-prefix) after already writing an element with no prefix (<Subscribe>) under a different namespace (the empty one). You could fix this by doing new XElement(eAuth + "Subscribe"), but the other elements underneath of that wouldn't automatically take on the eAuth namespace, which isn't what I think you intend.
I'm guessing you want to use the eAuth namespace for <Subscribe> as well as all its children--pretty much everything that isn't part of the soap envelope. To do that you need to preface all of your own nodes with eAuth.
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
XNamespace xsd = "http://www.w3.org/2001/XMLSchema";
XNamespace soap12 = "http://www.w3.org/2003/05/soap-envelope";
XNamespace eauth = "eAuthService";
XDocument xDoc = new XDocument (
new XElement (soap12 + "Envelope",
new XAttribute (XNamespace.Xmlns + "xsi", xsi),
new XAttribute (XNamespace.Xmlns + "xsd", xsd),
new XAttribute (XNamespace.Xmlns + "soap12", soap12),
new XElement (soap12 + "Body",
(new XElement (eauth + "Subscribe",
new XAttribute ("xmlns", "eAuthService"),
(new XElement (eauth + "RequestSubscription",
(new XElement (eauth + "Token", "Subscription")),
(new XElement (eauth + "ID_Subscription", myResources.registrationId)),
(new XElement (eauth + "DateOfBirth", main.pickDate.Text)),
(new XElement (eauth + "CountryCode3Letter", "IND")))))))));

Need help creating XML Document with XDocument

I am having trouble creating an XML document using LINQ.
The XML file I need to create has a root element of "ClinicalDocument".
The XML needs to be as follows
<?xml version="1.0" encoding="utf-8"?>
<ClinicalDocument xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="urn:hl7-org:v3"
xmlns:voc="urn:hl7-org:v3/voc"
xmlns:sdtc="urn:hl7-org:sdtc">
<!-- Rest of the document here. -->
</ClinicalDocument>
The code I have in trying to do this is
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
XDeclaration dec = new XDeclaration("1.0", "UTF-8", null);
XDocument xDoc = new XDocument(dec,null);
XElement cDoc = new XElement("ClinicalDocumnet");
xDoc.Add(cDoc);
cDoc.Add(new XAttribute(XNamespace.Xmlns + "xsi", xsi.NamespaceName));
cDoc.Add(new XAttribute("xmlns","urn:hl7-org:v3"));
cDoc.Add(new XAttribute(XNamespace.Xmlns + "stdc","urn:hl7-org:sdtc"));
cDoc.Add(new XAttribute(XNamespace.Xmlns + "voc","urn:hl7-org:v3/voc"));
xDoc.Save("C:\\test\\test.xml");
I get an exception when trying to save the file.
{"The prefix '' cannot be redefined from '' to 'urn:hl7-org:v3' within the same start element tag."}

XNamespace ns = "urn:hl7-org:v3";
xDoc = new XDocument(dec, null);
cDoc = new XElement(ns + "ClinicalDocument");
xDoc.Add(cDoc);
cDoc.Add(new XAttribute(XNamespace.Xmlns + "xsi", "http://www.w3.org/2001/XMLSchema-instance"));
cDoc.Add(new XAttribute(XNamespace.Xmlns + "stdc","urn:hl7-org:sdtc"));
cDoc.Add(new XAttribute(XNamespace.Xmlns + "voc","urn:hl7-org:v3/voc"));

Generate xml attributes

I have to create an xml file, that contains an element with attributes like:
<element
xsi:schemaLocation="http://test.xsd"
xmlns="http://test2"
xmlns:xsi=http://test3>
I tried:
XNamespace ns = "xsi";
var root = new XElement("element",
new XAttribute(ns + "schemaLocation", "http://test.xsd"), // (I)
new XAttribute(XNamespace.Xmlns, "http://test2"), // (II)
new XAttribute(XNamespace.Xmlns + "xsi", "http://test3"), // (III)
But the only thing that is generated fine is (III):
xmlns:xsi=http://test3
(I) is generated like:
p1:schemaLocation="http://test.xsd" xmlns:p1="xsi"
and (II) is not generated because the line doesn't compile.
Any idea on how I could generate these attributes?
Thank you,
L
EDIT - also found it here: Creating XML with namespaces and schemas from an XElement

const string ns = "http://test2";
const string si = "http://test3";
const string schema_location = "http://test.xsd";
XNamespace xns = ns;
XNamespace sinsp = si;
XElement xe = new XElement(xns + "element",
new XAttribute(XNamespace.Xmlns + "xsi", si),
new XAttribute(sinsp+ "schemaLocation", schema_location),
new XElement(xns + "sometag", "somecontent")
);
return xe;