LINQ to XML : Adding Namespace quickly

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I have written a post earlier on how to attach Namespaces. After reading my article someone complained about the redundancy of the code. I also realized the pain. I was reading the book C# 3.0 In a Nutshell. There I got a very elegant solution. Let me explain the scenario,

 

If you create a XML like,

 

<?xml version="1.0" encoding="utf-8" ?>

- <numbers xmlns="urn:myns-com">

  <number value="1" square="1" xmlns="" />

  <number value="2" square="4" xmlns="" />

  <number value="3" square="9" xmlns="" />

  <number value="4" square="16" xmlns="" />

  <number value="5" square="25" xmlns="" />

  <number value="6" square="36" xmlns="" />

  <number value="7" square="49" xmlns="" />

  <number value="8" square="64" xmlns="" />

  <number value="9" square="81" xmlns="" />

  <number value="10" square="100" xmlns="" />

</numbers>

 

By writing

 

XNamespace ns = XNamespace.Get("urn:myns-com");

XElement root = new XElement(ns+ "numbers",

    from i in Enumerable.Range(1, 10)

    select new XElement("number",

        new XAttribute("value", i),

        new XAttribute("square", i*i)));

 

Now since we have not added ns in all the blocks it adds xmlns=”” in all the areas. We can avoid this by writing,

 

XNamespace ns = XNamespace.Get("urn:myns-com");

XElement root = new XElement(ns+ "numbers",

    from i in Enumerable.Range(1, 10)

    select new XElement(ns + "number",

        new XAttribute("value", i),

        new XAttribute("square", i*i)));

 

Sometimes this could be painful if the structure is more complicated.

 

So writers have given us a tip,

foreach (XElement e in root.DescendantsAndSelf())

{

    if (e.Name.Namespace == "")

    {

        e.Name = ns + e.Name.LocalName;

    }

}

 

This will modify the existing Xml to

<?xml version="1.0" encoding="utf-8" ?>

- <numbers xmlns="urn:myns-com">

  <number value="1" square="1" />

  <number value="2" square="4" />

  <number value="3" square="9" />

  <number value="4" square="16" />

  <number value="5" square="25" />

  <number value="6" square="36" />

  <number value="7" square="49" />

  <number value="8" square="64" />

  <number value="9" square="81" />

  <number value="10" square="100" />

</numbers>

Namoskar!!!