使用名称空间添加XML属性

Question

I'm trying to add elements to an automatically generated XML file that I can then import back into the generator, but I'm running into an issue with some namespace attributes.

Here is what I'm trying to recreate:

<IP_Filter_Template_Guid dt:dt="string" xmlns:dt="urn:schemas-microsoft-com:datatypes">

Here is the code I'm using:

$xml = [System.Xml.XmlDocument](Get-Content $xmldoc)

$child1element = $xml.CreateElement($rapname)
$child1element.SetAttribute("name", $rapname)
$child1 = $xml.Root.Children.Microsoft_Internet_Authentication_Service.Children.RadiusProfiles.Children.AppendChild($child1element)

$child2element = $xml.CreateElement("Properties")
$child2 = $child1.AppendChild($child2element)

$child3element1 = $xml.CreateElement("IP_Filter_Template_Guid", $xmlns)
$child3element1.SetAttribute("dt", "urn:schemas-microsoft-com:datatypes", "string")
$child3element1.SetAttribute("dt", "urn:schemas-microsoft-com:xmlns", "urn:schemas-microsoft-com:datatypes")

$child3 = $child2.AppendChild($child3element1)

$child3element1.AppendChild($xml.CreateTextNode("{00000000-0000-0000-0000-000000000000}"))

$xml.Save("c:\xml.xml")

Here is the output I'm getting for the element:

<IP_Filter_Template_Guid d9p1:dt="urn:schemas-microsoft-com:datatypes" dt:dt="string" xmlns:d9p1="urn:schemas-microsoft-com:xmlns">

Answer 1

First create the new node as a plain XML node (no namespace manager needed):

$node = $xml.CreateElement('IP_Filter_Template_Guid')

Create a new attribute node with the desired namespace and assign a value to it:

$ns   = 'urn:schemas-microsoft-com:datatypes'
$attr = $xml.CreateAttribute('dt', 'dt', $ns)
$attr.Value = 'string'

Add the attribute to the XML node using SetAttributeNode() ( not SetAttribute() !):

$node.SetAttributeNode($attr)

Demonstration:

PS C:\> 
PS C:\> 
PS C:\> 
PS C:\> 
PS C:\> 
PS C:\> 
PS C:\> 
<IP_Filter_Template_Guid dt:dt="string" xmlns:dt="urn:schemas-microsoft-com:datatypes" />