PowerShell parse xml and save changes

Question

I'm parsing a csproj file for a nuget install and I've got a node that needs to be altered. The node in question is the node named "Generator" where it's value equals "TextTemplatingFileGenerator" and it's parent node has an attribute of "WebConfigSettingsGeneratorScript.tt" (the second part isn't in here yet).

Here's the script that I've got, but it's not quite done. It's working, but it saves an empty file. Also, it doesn't have the 2nd part of my where clause, which is

$path = 'C:\Projects\Intouch\NuGetTestPackage\NuGetTestPackage'
cd $path
$files = get-childitem -recurse -filter *.csproj
foreach ($file in $files){
    ""
    "Filename: {0}" -f $($file.Name)
    "=" * ($($file.FullName.Length) + 10)   

    if($file.Name -eq 'NuGetTestPackage1.csproj'){
        $xml = gc $file.FullName | 
        Where-Object { $_.Project.ItemGroup.None.Generator -eq 'TextTemplatingFileGenerator' } | 
        ForEach-Object { $_.Project.ItemGroup.None.Generator = '' }
        Set-Content $file.FullName $xml
    }   
}

Here's a basic version of the XML:

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup>
    <None Include="T4\WebConfigSettingGeneratorScript.tt">
      <Generator>TextTemplatingFileGenerator</Generator>
      <LastGenOutput>WebConfigSettingGeneratorScript.txt</LastGenOutput>
    </None>

Thanks a lot. I'm a total PowerShell n00b!

Keith Hill · Accepted Answer · 2011-05-18 15:34:26Z

30

As @empo says, you need to cast the output of gc $file.FullName to [xml] e.g. $xml = [xml](gc $file.FullName). And then after making the change but before looping to the next file, you need to save the file e.g. $xml.Save($file.FullName).

This works with the sample project you provided:

$file = gi .\test.csproj
$pattern = 'TextTemplatingFileGenerator'
$xml = [xml](gc $file)
$xml | Where {$_.Project.ItemGroup.None.Generator -eq $pattern} |
       Foreach {$_.Project.ItemGroup.None.Generator = ''}
$xml.Save($file.Fullname)

edited May 18, 2011 at 15:34

answered May 17, 2011 at 23:11

Keith Hill

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6 Comments

Don Rolling Over a year ago

This helps, but $xml.Save($file.FullName) is coming up as an Invalid Operation.

Keith Hill Over a year ago

The only exception XmlDocument.Save(string path) is documented to throw is a XmlException if the corresponding XmlDocument is not well formed. BTW you should also get rid of the Set-Content $file.FullName $xml since the $xml.Save($file.Fullname) call will save back over the original file.

Don Rolling Over a year ago

Great, I've taken the changes that you have offered. But, it doesn't seem to be making the change to the file. However, the script IS saving the file.

Don Rolling Over a year ago

The issue with this script is really just that my XML is more complicated than the bit that I provided and that's the real issue. Here's a simpler version of this question: stackoverflow.com/questions/6049323/…

Mariusz Ignatowicz Over a year ago

@DonRolling did you find out why the .csproj file was overwritten? I have the same issue when trying to update my .csproj file using NuGet package script tools\install.ps1

|

Emiliano Poggi · Accepted Answer · 2011-05-17 22:44:52Z

5

Are you missing a cast?

$xml = [xml] gc $file.FullName

answered May 17, 2011 at 22:44

Emiliano Poggi

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Comments

François Racine · Accepted Answer · 2020-11-27 00:38:16Z

0

OK, now my change is working:

    $fileName = “C:\sovgarde\updates.xml”;
$xml = [System.Xml.XmlDocument](Get-Content $fileName);

$child = $xml.CreateElement('option')
$child.SetAttribute('name', 'CHECK_NEEDED')
$child.SetAttribute('value','false')
If ($xml.application.component.option.name -icontains "CHECK_NEEDED") {
    
    $xml.SelectNodes("//option[@name=`"CHECK_NEEDED`"]") | % {$_.ParentNode.removechild($_) }
    #$xml.Save($fileName)   
    
}
$node = $xml.SelectSingleNode('//component')
$node.AppendChild($child)
$xml.Save($fileName)

edited Nov 27, 2020 at 0:38

answered Nov 26, 2020 at 20:46

François Racine

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