How to add Namespace and Declaration in XDocument

Question

I am creating xml in C#, and want to add Namespace and Declaration . My xml as below:

XNamespace ns = "http://ab.com//abc";

XDocument myXML = new XDocument(
    new XDeclaration("1.0","utf-8","yes"),
    new XElement(ns + "Root",
        new XElement("abc","1")))

This will add xmlns="" at both Root level and child element abc level as well.

<Root xmlns="http://ab.com/ab">
    <abc xmlns=""></abc>
</Root>

But I want it in only Root level not in child level like below:

<Root xmlns="http://ab.com/ab">
    <abc></abc>
</Root>

and how to add Declaration at Top, my code not showing Declaration after run.

Please help me to get the complete xml as

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<Root xmlns="http://ab.com/ab">
    <abc></abc>
</Root>

Community · Accepted Answer · 2017-05-23 11:51:06Z

2

You need to use the same namespace in your child elements:

XDocument myXML = new XDocument(
    new XDeclaration("1.0","utf-8","yes"),
        new XElement(ns + "Root",
            new XElement(ns + "abc", "1")))

If you just use "abc" this will be converted to an XName with no Namespace. This then results in an xmlns="" attribute being added so the fully qualified element name for abc would be resolved as such.

By setting the name to ns + "abc" no xmlns attribute will be added when converted to string as the default namespace of http://ab.com/ab is inherited from Root.

If you wanted to simply 'inherit' the namespace then you wouldn't be able to do this in such a fluent way. You'd have create the XName using the namespace of the parent element, for example:

 var root = new XElement(ns + "Root");
 root.Add(new XElement(root.Name.Namespace + "abc", "1"));

Regarding the declaration, XDocument doesn't include this when calling ToString. It will if you use Save to write to a Stream, TextWriter, or if you supply an XmlWriter that doesn't have OmitXmlDeclaration = true in its XmlWriterSettings.

If you wanted to just get the string, this question has an answer with a nifty extension method using a StringWriter.

edited May 23, 2017 at 11:51

CommunityBot

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answered Jun 1, 2015 at 18:01

Charles Mager

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2 Comments

user1893874 Over a year ago

Thanks for the answer. If i dont want to refer namespace in child element then how to implement ?

Charles Mager Over a year ago

@user1893874 there's no easy way, I've added a possible option. How you apply this depends on the wider context of your code.

Martin Honnen · Accepted Answer · 2015-06-01 18:01:59Z

0

Use the namespace on all elements you create:

XDocument myXML = new XDocument(
                  new XDeclaration("1.0","utf-8","yes"),
                  new XElement(ns + "Root",
                     new XElement(ns + "abc","1")))

answered Jun 1, 2015 at 18:01

Martin Honnen

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1 Comment

user1893874 Over a year ago

Thanks for the answers. cant i add namespace only to the Root element ?

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