CODEWITHSUNDEEP
c#xmllinqnamespaces
Edward83
Edward83

Reputation: 6686

XElement namespaces (How to?)

How to create xml document with node prefix like:

<sphinx:docset>
  <sphinx:schema>
    <sphinx:field name="subject"/>
    <sphinx:field name="content"/>
    <sphinx:attr name="published" type="timestamp"/>
 </sphinx:schema>

When I try to run something like new XElement("sphinx:docset") i getting exception

Unhandled Exception: System.Xml.XmlException: The ':' character, hexadecimal val ue 0x3A, cannot be included in a name.
at System.Xml.XmlConvert.VerifyNCName(String name, ExceptionType exceptionTyp e)
at System.Xml.Linq.XName..ctor(XNamespace ns, String localName)
at System.Xml.Linq.XNamespace.GetName(String localName)
at System.Xml.Linq.XName.Get(String expandedName)

Upvotes: 76

Views: 70513

Answers (3)

fr0ga
fr0ga

Reputation: 349

Step by step using LINQ to XML:

XNamespace ns = "http://url/for/sphinx";
XAttribute sphinx = new XAttribute(XNamespace.Xmlns + "sphinx", ns);
XElement docset = new XElement(ns + "docset", sphinx);               

XElement schema = new XElement(ns + "schema"); 
docset.Add(schema);

XElement field1 = new XElement(ns + "field", new XAttribute("name", "subject"));
XElement field2 = new XElement(ns +  "field", new XAttribute("name", "content"));
XElement attr = new XElement(ns + "attr",
    new XAttribute("name", "published"),
    new XAttribute("type", "timestamp"));

schema.Add(field1, field2, attr);  

Console.WriteLine(docset);

Output:

<sphinx:docset xmlns:sphinx="http://url/for/sphinx">
  <sphinx:schema>
    <sphinx:field name="subject" />
    <sphinx:field name="content" />
    <sphinx:attr name="published" type="timestamp" />
  </sphinx:schema>
</sphinx:docset>

Upvotes: -1

Adam Rackis
Adam Rackis

Reputation: 83356

You can read the namespace of your document and use it in queries like this:

XDocument xml = XDocument.Load(address);
XNamespace ns = xml.Root.Name.Namespace;
foreach (XElement el in xml.Descendants(ns + "whateverYourElementNameIs"))
    //do stuff

Upvotes: 22

Jon Skeet
Jon Skeet

Reputation: 1500525

It's really easy in LINQ to XML:

XNamespace ns = "sphinx";
XElement element = new XElement(ns + "docset");

Or to make the "alias" work properly to make it look like your examples, something like this:

XNamespace ns = "http://url/for/sphinx";
XElement element = new XElement("container",
    new XAttribute(XNamespace.Xmlns + "sphinx", ns),
    new XElement(ns + "docset",
        new XElement(ns + "schema"),
            new XElement(ns + "field", new XAttribute("name", "subject")),
            new XElement(ns + "field", new XAttribute("name", "content")),
            new XElement(ns + "attr", 
                         new XAttribute("name", "published"),
                         new XAttribute("type", "timestamp"))));

That produces:

<container xmlns:sphinx="http://url/for/sphinx">
  <sphinx:docset>
    <sphinx:schema />
    <sphinx:field name="subject" />
    <sphinx:field name="content" />
    <sphinx:attr name="published" type="timestamp" />
  </sphinx:docset>
</container>

Upvotes: 128

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