Powershell scripts and .Net assemblies–force PS to run later .Net CLR

Recently i was writing a PS script to check a list of websites. To do this I was using a .net class

HttpWebRequest

So I wrote the script in powerGUI on the server where I wanted the script to run. I got it working within powerGUI, so I thought I would then schedule the script.

But when I run the script from the tesk scheduler I was met with an error, stating that one of the objects I wanted to use didnot contain a method.

Method invocation failed because [System.Net.HttpWebResponse] doesn't contain a method named 'Dispose'.

What?!, it worked fine in the powerGUI on the same server.

Anyway I eventually tracked this down to the fact that powershell 2.0 starts with an older .Net framework CLR. So I needed to get powershell to run a later version.

I found an article here, it explains the problem and the solutions nicely.

http://viziblr.com/news/2012/5/16/the-easy-way-to-run-powershell-20-using-net-framework-40.html

I created the xml files in the locations specified and it solved my problems.

C:\Windows\System32\WindowsPowerShell\v1.0

• powershell.exe.config



• powershell_ise.exe.config

XML contents

<?xml version="1.0"?>

<configuration>


    <startup useLegacyV2RuntimeActivationPolicy="true">


        <supportedRuntime version="v4.0.30319"/>


        <supportedRuntime version="v2.0.50727"/>


    </startup>


</configuration>

Powershell scripts and .Net assemblies–force PS to run later .Net CLR