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PORunning powershell in C#, not having much luck!
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  1. PORunning powershell in C#, not having much luck!
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    copied!<p>I have created a asp.net web application for internal use that allows certain users to start and stop Virtual machines that are linked to there QA testing environments, the code behind page runs a powershell script that starts the selected server once a button is pressed on an ASP.net page.</p> <p>I have reserched and implimented alot of the code from this site but i am coming up against a few problems.</p> <p>everytime i click the button on the main web page the error that is fed back from the powershell script says"You cannot call a method on a null-valued expression." the only problem is if i run it from a powershell prompt like this ". \script\test.ps1 'W7EA9'" it works fine.</p> <p>This is the class that calls the powershell script.</p> <pre><code> public String Startserver(String Servername) { String scriptText =". \\scripts\\test.ps1 " + Servername + ""; // create Powershell runspace Runspace runspace = RunspaceFactory.CreateRunspace(); // open it runspace.Open(); // create a pipeline and feed it the script text Pipeline pipeline = runspace.CreatePipeline(); pipeline.Commands.AddScript(scriptText); // execute the script Collection&lt;PSObject&gt; results = new Collection&lt;PSObject&gt;(); try { results = pipeline.Invoke(); } catch (Exception ex) { results.Add(new PSObject((object)ex.Message)); } // close the runspace runspace.Close(); // convert the script result into a single string StringBuilder stringBuilder = new StringBuilder(); foreach (PSObject obj in results) { stringBuilder.AppendLine(obj.ToString()); } return stringBuilder.ToString(); //return scriptText; } </code></pre> <p>and here is the powershell script it is trying to run</p> <pre><code> Param ($server = $arg[0]) $Core = get-wmiobject -namespace root\virtualization -class Msvm_Computersystem -filter "ElementName = '$server'" $status = $Core.RequestStateChange(2) ` </code></pre> <p>It may be somthing really obvious but im just not seeing it and any help would be great.</p> <p>thanks </p> <p>Chris</p>
 

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