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Add xsi:type to my XML document

I have a code to extract an XML document type using this web service method
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
XAttribute attribute = new XAttribute(xsi + "type", "xsd:string");
XElement node_user_id = new XElement("user_id", attribute, user.code);
XDocument doc = new XDocument(new XElement("ranzcp_user", new XAttribute(XNamespace.Xmlns + "ns1", "urn:logon"), node_user_id));
XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(elem.ToString());
With the above code i was able to extract an xml document exactly like this :
<ranzcp_user xmlns:ns1="urn:logon">
<user_id xmlns:p3="http://www.w3.org/2001/XMLSchema-instance" p3:type="xsd:string">12345678</user_id>
</ranzcp_user>
But what i really need to have is this :
<ranzcp_user xmlns:ns1="urn:logon">
<user_id xsi:type="xsd:string">12345678</user_id>
</ranzcp_user>
Is there any way i could get the format i need for the xml, and second do the xsi:type="xsd:string" attribute was neccessary when the xml data was parsed?
TIA!

You could explicitly define the namespace prefix so you use the canonical xsi rather than p3:
var doc = new XDocument(
new XElement("ranzcp_user",
new XAttribute(XNamespace.Xmlns + "ns1", "urn:logon"),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XElement("user_id", 12345678,
new XAttribute(xsi + "type", "xsd:string")
)
)
);
See this fiddle. This gives you:
<ranzcp_user xmlns:ns1="urn:logon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<user_id xsi:type="xsd:string">12345678</user_id>
</ranzcp_user>
But, as has been said, removing the namespace prefix entirely would result in invalid XML - no conforming processor will let you create it or read it without errors.
Could it be that the 'required' XML has this prefix declared in one of the parent elements? If not, I'd suggest it's a mistake and you should investigate this before spending time trying to remove the attribute. I suspect you'd end up undoing all that effort when the consumer works out the XML is invalid.

Write NameSpaces in XML

I need to generate an XML file using C# class (XmlDocument or XDocument) with the following root element:
<ns1:ConsultaSeqRps xmlns:ns1="http://localhost:8080/WsNFe2/lote"
xmlns:tipos="http://localhost:8080/WsNFe2/tp"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://localhost:8080/WsNFe2/lote http://localhost:8080/WsNFe2/xsd/ConsultaSeqRps.xsd">
I've tried various alternatives using setAttribute and XmlNamespaceManager but without success.

It's pretty straightforward, except maybe for the use of XAttribute to add a named namespace:
XNamespace ns1 = "http://localhost:8080/WsNFe2/lote";
XNamespace tipos = "http://localhost:8080/WsNFe2/tp";
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
var doc = new XElement(ns1 + "ConsultaSeqRps",
new XAttribute(XNamespace.Xmlns + "ns1", ns1),
new XAttribute(XNamespace.Xmlns + "tipos", tipos),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XAttribute(xsi + "schemaLocation",
"http://localhost:8080/WsNFe2/lote http://localhost:8080/WsNFe2/xsd/ConsultaSeqRps.xsd")
);

You can take the advantage of LINQ to XML, the following article will help you to Create namespace in c#
How to: Create a Document with Namespaces (C#) (LINQ to XML)
Hope that help.
Regards

Add multiple namespacs with same address to XDocument

I need to add multiple namespaces to the xdocument with same address (C#)
<root xmlns:f="urn://xml.voodoo.net/vd/formating-1.0" xmlns="urn://xml.voodoo.net/vd/formating-1.0">
<a:something>stuff and more stuff</a:something>
</root>
if i add using the below code.. it shows only xmlns:f
XNamespace defaultNS = "urn://xml.voodoo.net/vd/formating-1.0";
XNamespace f = "urn://xml.voodoo.net/vd/formating-1.0";
XElement rootElement = new XElement(defaultNS + "root",
new XAttribute(XNamespace.Xmlns + "f", f.NamespaceName),
how to show 2 namespaces?? is it even possible?

var doc = new XDocument(
new XElement(defaultNS + "root",
new XAttribute(XNamespace.Xmlns + "f", defaultNS),
new XAttribute("xmlns", defaultNS),
new XElement(defaultNS + "something",
new XAttribute(XNamespace.Xmlns + "f", defaultNS), "stuff and more stuff")
)
);
Desired output:
<root xmlns:f="urn://xml.voodoo.net/vd/formating-1.0" xmlns="urn://xml.voodoo.net/vd/formating-1.0">
<f:something xmlns:f="urn://xml.voodoo.net/vd/formating-1.0">stuff and more stuff</f:something>
</root>

Your XML example is incorrect, the 'f' namespace is not used, whereas there is an 'a' namespace present.
Your C# code does not match your XML, it creates an element with an attribute.
Anyhow, a namespace definitions within an XML document only makes sense if you actually use it. If you create an XML document via C# code, it will generate XML which is semantically correct, yet might not match the syntax of your example.

ASP.net Creating an XLink node in and XDocument

I am trying to programmatically add a new XLink node to an XDocument but .Net seems to be creating them as atomized namespaces and names and I can't find any code to add XLink nodes to XML?
My code looks like this:
//read in the current XML content
XDocument content = XDocument.Parse(xmlContent);
//add a new node called large images
XElement newNode = new XElement("large_images", "");
newNode.SetAttributeValue("{xmlns}xlink", "http://www.w3.org/1999/xlink");
newNode.SetAttributeValue("{xlink}type", "simple");
newNode.SetAttributeValue("{xlink}href", "tcm:5-550");
newNode.SetAttributeValue("{xlink}title", "of1_454x340.jpg");
content.Add(newNode);
Unfortunately this newNode comes out like this:
<large_images p1:xlink="http://www.w3.org/1999/xlink" p2:type="simple" p2:href="tcm:5-550" p2:title="of1_454x340.jpg" xmlns:p2="xlink" xmlns:p1="xmlns"></large_images>
But I need the node to look like this in order for it to pass the XML validation:
<large_images xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="tcm:5-550" xlink:title="of1_454x340.jpg"></large_images>
Can anybody help? I don't want to go down the String.Replace() route as it seems that this must be possible another way?
Thanks
Ryan

I'd do that as:
XNamespace ns = "http://www.w3.org/1999/xlink";
XElement newNode = new XElement("large_images",
new XAttribute(XNamespace.Xmlns + "xlink", ns),
new XAttribute(ns + "type", "simple),
new XAttribute(ns + "href", "tcm:5-550"),
new XAttribute(ns + "title", "of1_454x340.jpg"));
This produces XML of:
<large_images xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple"
xlink:href="tcm:5-550" xlink:title="of1_454x340.jpg" />

how to add(or ignore) XML namespace when using XElement.Load

I am creating XML using Linq to XML and C#. It all works great except when I need to manually add in a row in the XML. This row is only added if I have a value to pass through to it, otherwise I just ignore the entire tag.
I use XElement.Load to load in the string of text that I store in a string but when I attach it to the XML it always puts in xmlns="" at the end of my tag.
Is there a way I can tell XElement.Load to use the existing namespace or to ignore it when putting in the string to the XML?
Ideally I just want my string to be included to the XML being created without extra tags being added.
Below is a sample of what I currently do:
string XMLDetails = null;
if (ValuePassedThrough != null)
XMLDetails = "<MyNewTag Code=\"14\" Value=\"" + ValuePassedThrough +"\"></MyNewTag>";
When I build up the XML I load the above string into my XML. It is here where xmlns="" is being added to the XMLDetails value but ideally I want this ignored as it is causing issues with the recipient when they try to read this tag.
XNamespace ns = "http://namespace-address";
XNamespace xsi = "http://XMLSchema-instance-address";
XDocument RequestDoc = new XDocument(
new XDeclaration("1.0", "utf-8", null),
new XElement(ns + "HeaderTag",
new XAttribute("xmlns", ns),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XAttribute(xsi + "schemaLocation", "http://www.addressofschema.xsd"),
new XAttribute("Version", "1"),
new XElement(ns + "OpeningTAG",
...My XML Code ...
XElement.Load(new StringReader(XMLDetails))
...End of XML Code ...
As mentioned above. My code works, it successfully outputs XML for me. Its just the MyNewTag tag I load in using XElement.Load gets xmlns="" added to the end of it which is causing me an issue.
Any ideas how I can work around this? Thanks for your help.
Regards,
Rich

How about:
XElement withoutNamespace = XElement.Load(new StringReader(XMLDetails));
XElement withNamespace = new XElement(ns + withoutNamespace.Name.LocalName,
withoutNamespace.Nodes());
As a better alternative - why don't you either include the namespace when you're building up the XML, or even better, create an XElement instead of manually generating an XML string which you then read. Manually creating XML is very rarely a good idea. Aside from anything else, you're assuming that ValuePassedThrough has already been escaped, or doesn't need escaping etc. That may be valid - but it's at least a cause for concern.

Like this
XElement XMLDetails = new XElement(ns + "OpeningTAG", new XElement(ns + "MyNewTag", new XAttribute("Code", 14), new XAttribute("Value", 123)));
XDocument RequestDoc = new XDocument(
new XDeclaration("1.0", "utf-8", null),
new XElement(ns + "HeaderTag",
new XAttribute("xmlns", ns),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XAttribute(xsi + "schemaLocation", "http://www.addressofschema.xsd"),
new XAttribute("Version", "1"),
XMLDetails));