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I'm attempting to run a powershell script from C#. I have no problem passing strings to the script however when I try to pass an array to the powershell script an exception gets thrown. Here is the C# code:

string [] test = {"1","2","3","4"};

RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);

runspace.ApartmentState = System.Threading.ApartmentState.STA;
runspace.ThreadOptions = PSThreadOptions.UseCurrentThread;

runspace.Open();
RunspaceInvoke invoker = new RunspaceInvoke();
invoker.Invoke("Set-ExecutionPolicy Unrestricted");

Pipeline pipeline = runspace.CreatePipeline();
Command myCmd = new Command(@"C:\test.ps1");
CommandParameter param = new CommandParameter("responseCollection", test);
myCmd.Parameters.Add(param);
pipeline.Commands.Add(myCmd);

// Execute PowerShell script
Collection<PSObject> results = pipeline.Invoke();

Here is the powershell script:

param([string[]] $reponseCollection)
$a = $responseCollection[0]

Every time this code executes it throws:

Cannot index into a null array.

I know that the code to execute the powershell script is correct when passing strings to the powershell script, it has been thoroughly tested.

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2 Answers

up vote 4 down vote accepted

It works perfectly fine for me.

Only thing I notice is that, in your script params you have $reponseCollection - the s is missing in response. Unless you made a mistake in entering it here, that would be the reason.

It might have seemed to work with string because Powershell doesn't care ( normally) when you assign / use a non-existing variable. But when you index into a null / non-existing variable, it does throw the error.

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I can't believe this was the problem. It took me hours to just narrow down that this is where the problem was. – firthh Dec 1 '11 at 5:38
up vote -2 down vote

I think that you need to pass the array to powershell as a string in powershell array format, i.e.,

string test = "('1','2','3','4')";
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Nope :( Same error – firthh Dec 1 '11 at 5:28

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