(PowerShell) Find and Update an XML Attribute Value

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Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# Let's say you have 2 XML files with identical structures as shown directly below,
# and you wish to update the values in the 1st XML file with those in the 2nd XML file.

# <global>
#     <phrase id="2FADisabled" value="2factor authentication disabled"/>
#     <phrase id="2FAEnabled" value="2factor authentication enabled"/>
#     <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
# </global>

# <global>
#     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
#     <phrase id="2FADisabled" value="2FA authentication disabled"/>
#     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
# </global>

# First, initialize each of the Chilkat XML objects.
# These could be loaded from files, but we'll just create them manually for this example..

$xml1 = New-Object Chilkat.Xml
$xml1.Tag = "global"
$xml1.UpdateAttrAt("phrase",$true,"id","2FADisabled")
$xml1.UpdateAttrAt("phrase",$true,"value","2factor authentication disabled")
$xml1.UpdateAttrAt("phrase[1]",$true,"id","2FAEnabled")
$xml1.UpdateAttrAt("phrase[1]",$true,"value","2factor authentication enabled")
$xml1.UpdateAttrAt("phrase[2]",$true,"id","2FAResetFailed")
$xml1.UpdateAttrAt("phrase[2]",$true,"value","Failed to disable two factor authentication")

$xml2 = New-Object Chilkat.Xml
$xml2.Tag = "global"
$xml2.UpdateAttrAt("phrase",$true,"id","2FAResetFailed")
$xml2.UpdateAttrAt("phrase",$true,"value","Failed to reset two factor authentication")
$xml2.UpdateAttrAt("phrase[1]",$true,"id","2FADisabled")
$xml2.UpdateAttrAt("phrase[1]",$true,"value","2FA authentication disabled")
$xml2.UpdateAttrAt("phrase[2]",$true,"id","2FAEnabled")
$xml2.UpdateAttrAt("phrase[2]",$true,"value","2FA authentication enabled")

# Iterate over attribute values in xml2 and update the same in xml1.

$sbPath = New-Object Chilkat.StringBuilder

$i = 0
$count_i = $xml2.NumChildrenHavingTag("phrase")
while ($i -lt $count_i) {
    $xml2.I = $i
    $phrase_id = $xml2.ChilkatPath("phrase[i]|(id)")
    $phrase_value = $xml2.ChilkatPath("phrase[i]|(value)")

    # Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
    # to find the location of the XML element to be updated.
    # Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
    # find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
    # matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
    # We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
    $sbPath.SetString("/A/phrase,id,")
    $sbPath.Append($phrase_id)

    # This assumes the corresponding element exists in xml1.
    $xml1.UpdateAttrAt($sbPath.GetAsString(),$true,"value",$phrase_value)

    $i = $i + 1
}

# Now see how xml1 has been updated..
$($xml1.GetXml())