Updating config xml file and save it using powershell

Question

I need to update this config file in such a way that, all the values of 'newVersion' needs to be updated to a single value.

<configuration>
<runtime>
<assemblyBinding>
  <dependentAssembly>
        <assemblyIdentity name="A" 
publicKeyToken="5d861ad8ad8cd06f" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-65534.65534.65534.65534" newVersion="4.0.0.103" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="B" publicKeyToken="ae714df8cd90bc8f" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-65534.65534.65534.65534" newVersion="4.0.0.103" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="C" publicKeyToken="22955931b98512b6" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-65534.65534.65534.65534" newVersion="4.0.0.103" />
      </dependentAssembly>
      <dependentAssembly>
                <assemblyIdentity name="D"
                                  publicKeyToken="585a888b4a9ba2e3"
                                  culture="neutral" />
                <bindingRedirect oldVersion="0.0.0.0-65534.65534.65534.65534"
                                 newVersion="2.5.0.1286"/>

              </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
  </startup>
</configuration>

I have tried this below

$appconfig='file location'
$doc = (Get-Content $appconfig) -as [Xml]
$obj = $doc.configuration.runtime.assemblyBinding.dependentAssembly
$obj2 = $obj.assemblyIdentity | where {$_.name -eq 'D'}
$obj.bindingRedirect.newVersion="1.1.1.1"
echo $obj.bindingRedirect.newVersion
$doc.Save($appconfig)

I know this would change only to the "D" part, how can change to the above A,B and C also. Thanks for your help !

Loïc MICHEL · Accepted Answer · 2015-02-13 10:52:36Z

1

(gc C:\temp\config.xml) -replace '(newversion=)".*?"' ,'$1"1.1.1.1"' # if you want to save the file add |sc c:\temp\config.xml

edited Feb 13, 2015 at 10:52

answered Feb 11, 2015 at 20:53

Loïc MICHEL

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8 Comments

Manuel Batsching Over a year ago

'newversion=.*' will also match and replace the closing "/>" and thereby render your XML-file invalid. I'd rather use: (gc C:\temp\config.xml) -replace '(newversion=)".*?"', '$1"1.1.1.1"'.

Manuel Batsching Over a year ago

Keep in mind, that this replaces the value of ALL occurences of "newversion", regardless of which node it is an attribute. The answer of @dotnetom is more save.

Loïc MICHEL Over a year ago

@ManuelBatsching thanks for the remarks. Btw the op said he wants to replace all occurrence and did not mention any restriction. Using replace is more intuitive in this case I think.

Bhaskar Over a year ago

Thank you Manuel and Kayasax, yes it is true that even closing "/>" got replaced and I just added 'newversion="%buildnumber%/>"' immediately. However, how should I understand -replace '(newversion=)".*?"', '$1"1.1.1.1"'.. If the question mark is representing only a single character, then I think /> are 2 characters right... correct me.. I might be completely wrong on this... thanks to both of you again..

Manuel Batsching Over a year ago

The star-quantor in the regular expression .*" is greedy, which means that it will match as much as possible. In your case it will match any character until it finds the last " in the line. This works in the example above only if newversion="someValue" is the last attribute in the line. If not, it will mess up your XML-document again, because it will also match any attributes that follow newversion. The ? removes this danger by changing the behavior of the star-quantor to "non-greedy". So I'd like to encourage you to keep the ?.

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