PowerShell doesn't allow me to add XML node to XML file (using PowerShell 5.1.183)

Question

I have been stuck on this from a week where I am trying to append a XML node to a parent XML element. the child node and the parent node look like this :

[xml]$childxml = @"
<ClaimsProvider>
    <Bomain> hey there</Bomain>
    <Name>Login using </Name>
    <TechnicalProfiles>
        <TechnicalProfile Id="MIDC-What">
            <DisplayName> Employee</DisplayName>
            <Description>Login with your account</Description>
            <Protocol Name="OpenIdConnect" />
            <Metadata>
                <Item Key="METADATA">https://login.microsoftonline.com</Item>
                <Item Key="client_id">Mangal</Item>
                <Item Key="ValidTokenIssuerPrefixes">https://login.microsoftonline.com</Item>
            </Metadata>
            <Cryptograph>
                <Key Id="client_secret" StorageReferenceId="key" />
            </Cryptograph>
            <IncludeTechnicalProfile ReferenceId="MIDC-Shared" />
        </TechnicalProfile>
    </TechnicalProfiles>
</ClaimsProvider>
"@

And I want to add this child node to this file (filename: permissions.xml)

<TrustFrameworkPolicy xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"">
  <BasePolicy>
  </BasePolicy>
  <BuildingBlocks></BuildingBlocks>
  <ClaimsProviders>
    <ClaimsProvider>
    <Bomain> hey there 1</Bomain>
    <Name>Login using </Name>
    <TechnicalProfiles>
        <TechnicalProfile Id="MIDC-What">
            <DisplayName> Employee</DisplayName>
            <Description>Login with your account</Description>
            <Protocol Name="OpenIdConnect" />
            <Metadata>
                <Item Key="METADATA">https://login.microsoftonline.com</Item>
                <Item Key="client_id">Mangal</Item>
                <Item Key="ValidTokenIssuerPrefixes">https://login.microsoftonline.com</Item>
            </Metadata>
            <Cryptograph>
                <Key Id="client_secret" StorageReferenceId="key" />
            </Cryptograph>
            <IncludeTechnicalProfile ReferenceId="MIDC-Shared" />
        </TechnicalProfile>
    </TechnicalProfiles>
</ClaimsProvider>
    <ClaimsProvider>
    <Bomain> hey there 2</Bomain>
    <Name>Login using </Name>
    <TechnicalProfiles>
        <TechnicalProfile Id="MIDC-What">
            <DisplayName> Employee</DisplayName>
            <Description>Login with your account</Description>
            <Protocol Name="OpenIdConnect" />
            <Metadata>
                <Item Key="METADATA">https://login.microsoftonline.com</Item>
                <Item Key="client_id">Mangal</Item>
                <Item Key="ValidTokenIssuerPrefixes">https://login.microsoftonline.com</Item>
            </Metadata>
            <Cryptograph>
                <Key Id="client_secret" StorageReferenceId="key" />
            </Cryptograph>
            <IncludeTechnicalProfile ReferenceId="MIDC-Shared" />
        </TechnicalProfile>
    </TechnicalProfiles>
</ClaimsProvider>
    <ClaimsProvider>
    <Bomain> hey there 3</Bomain>
    <Name>Login using </Name>
    <TechnicalProfiles>
        <TechnicalProfile Id="MIDC-What">
            <DisplayName> Employee</DisplayName>
            <Description>Login with your account</Description>
            <Protocol Name="OpenIdConnect" />
            <Metadata>
                <Item Key="METADATA">https://login.microsoftonline.com</Item>
                <Item Key="client_id">Mangal</Item>
                <Item Key="ValidTokenIssuerPrefixes">https://login.microsoftonline.com</Item>
            </Metadata>
            <Cryptograph>
                <Key Id="client_secret" StorageReferenceId="key" />
            </Cryptograph>
            <IncludeTechnicalProfile ReferenceId="MIDC-Shared" />
        </TechnicalProfile>
    </TechnicalProfiles>
</ClaimsProvider>
  </ClaimsProviders>
</TrustFrameworkPolicy>

I am doing this right now:

Saving doc in a variable

$doc = [xml](Get-Content permissions.xml)

Appending the child variable to $doc xml

[Void]$doc.TrustFrameworkPolicy.ClaimsProviders.AppendChild($childxml)

I am getting the following error:

Exception calling "AppendChild" with "1" argument(s): "The specified node cannot be inserted as the valid child of this node, because the specified node is the wrong type."

why do you say powershell 5 is the version you are using ... and then add tags for v2, v3, and v4? — Lee_Dailey
– Lee_Dailey, Commented Jan 18, 2021 at 5:30

zett42 · Accepted Answer · 2021-01-18 10:05:13Z

4

You can't append an XmlNode from a different XML document. Instead you have to create a node from the document to be appended to:

$childxml = $doc.CreateDocumentFragment()
$childxml.InnerXml = @'
<ClaimsProvider>
    <Bomain> hey there</Bomain>
    <Name>Login using </Name>
    <TechnicalProfiles>
        <TechnicalProfile Id="MIDC-What">
            <DisplayName> Employee</DisplayName>
            <Description>Login with your account</Description>
            <Protocol Name="OpenIdConnect" />
            <Metadata>
                <Item Key="METADATA">https://login.microsoftonline.com</Item>
                <Item Key="client_id">Mangal</Item>
                <Item Key="ValidTokenIssuerPrefixes">https://login.microsoftonline.com</Item>
            </Metadata>
            <Cryptograph>
                <Key Id="client_secret" StorageReferenceId="key" />
            </Cryptograph>
            <IncludeTechnicalProfile ReferenceId="MIDC-Shared" />
        </TechnicalProfile>
    </TechnicalProfiles>
</ClaimsProvider>
'@

[Void]$doc.TrustFrameworkPolicy.ClaimsProviders.AppendChild($childxml)

See also: Append XML string block to existing XmlDocument

edited Jan 18, 2021 at 10:05

answered Jan 18, 2021 at 9:27

zett42

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4 Comments

Ashwin Agarkhed Over a year ago

Thanks a lot @zett42 It works like a charm!

Ashwin Agarkhed Over a year ago

One thing, I always get the child element as<ClaimsProvider xmlns=""> ... </ClaimsProvider> in the output. I want it to be plain vanilla <ClaimsProvider>....</ClaimsProvider> . Any suggessions for that? Thanks for such swift replies :-)

Ashwin Agarkhed Over a year ago

got it. added this $doc.OuterXml.Replace(" xmlns=""", "") handels such stupid additions by visual code

zett42 Over a year ago

@AshwinAgarkhed Strange, it didn't insert xmlns="" for me. It can happen when the target document contains a xmlns= attribute. In this case the clean way to fix it would be: targetElement.AppendChild( $childxml, "InsertNameSpaceUriOfDocument"). The function would detect that you are inserting something with same namespace as target element and omit the xmlns= attribute.

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