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c#linqlinq-to-xml
Sangram Nandkhile
Sangram Nandkhile

Reputation: 18202

Xdocument - Read value of attribute with Prefix

It is easy to find out value of Xdocument attribute but how do we find attribute with prefix/Namespace.

XML code

 <label:label xlink:type="resource" xlink:label="something" xlink:lang="en" xlink:id="res_4">My value</label:label>

I am trying to read attribute value xlink:Id (where p is XElement)

p => p.Attribute("xlink:id").Value

Which doesn't work at all.

Upvotes: 3

Views: 3004

Answers (2)

C&#233;dric Bignon
C&#233;dric Bignon

Reputation: 13022

Use the XName class:

XName.Get("id", XLinkNamespaceName)

With XLinkNamespaceName the namespace with the prefix xlink.

To get the namespace from a prefix, you can use: XElement.GetNamespaceOfPrefix().

p => p.Attribute(p.GetNamespaceOfPrefix("xlink") + "id").Value

But I advise you not to work with prefixes in your C# code and use namespace instead. Indeed,

<myFile xmlns:myPrefix="http://www.tempUri.org/MyNamespace">
    <something myPrefix:myAttribute="myValue" />
</myFile>

Is "functionally" equivalent to:

<myFile xmlns:dfgerge="http://www.tempUri.org/MyNamespace">
    <something dfgerge:myAttribute="myValue" />
</myFile>

Upvotes: 2

har07
har07

Reputation: 89325

Given you have declaration of the namespace prefix somewhere in the XML :

xmlns:xlink="dummy.url"

You can use XNamespace variable that point to above namespace URI to access an attribute in the namespace :

XNamespace xlink = "dummy.url";
.....
p => p.Attribute(xlink+"id").Value
//or simply cast the XAttribute to string 
//to avoid exception when the attribute not found in p
p => (string)p.Attribute(xlink+"id")

Upvotes: 5

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