Calling ps script file in c# using automation dll

Question

I am trying to call Powershell script file with parameters in C# using the System.Management.Automation like this:

using (var ps = PowerShell.Create())
{
    try
    {
        var script = System.IO.File.ReadAllText("MyPsFile.ps1");
        ps.Commands.AddScript(script);
         ps.AddScript(script);
        ps.AddParameter("MyKey1", value1);
        ps.AddParameter("MyKey2", value2);
        var results = ps.Invoke();
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.Message);
    }
}

The Powershell file looks like this:

function MyFunction {
    Param (
        [Parameter(Mandatory=$true)][string] $MyKey1,
        [Parameter(Mandatory=$true)][string] $MyKey1,
    )
    Process {        
      ..do some stuff
    }
}
MyFunction $args[0] $args[1]

If I run the script file inside Powershell like this:

powershell -file MyPsFile.ps1 "Value1" "Value2"

It works fine. But calling the file from within C# is not working. Any idea why?

So I have updated the code like this

var runspace = RunspaceFactory.CreateRunspace();
                    runspace.Open();

                    var runSpaceInvoker = new RunspaceInvoke(runspace);
                    runSpaceInvoker.Invoke("Set-ExecutionPolicy Unrestricted");

                    // create a pipeline and feed it the script text
                    var pipeline = runspace.CreatePipeline();
                    var command = new Command(@". .\MyScript.ps1");
                    command.Parameters.Add("MyParam1", value1);
                    command.Parameters.Add("MyParam2", value2);
                    pipeline.Commands.Add(command);

                    pipeline.Invoke();
                    runspace.Close();

But I am getting the error Powershell ps1 file “is not recognized as a cmdlet, function, operable program, or script file.”

I found this Powershell ps1 file "is not recognized as a cmdlet, function, operable program, or script file."

But it did not solve the problem. Any idea what else could cause this error?

What's the error? Looks like an error that can be solved by reading the error message. — Fabian S.
– Fabian S., Commented Jan 10, 2018 at 14:12
Hi @FabianH there is no error it runs fine. I left it empty cause I am just debugging. I have the real try catch in the parent. — doorman
– doorman, Commented Jan 10, 2018 at 14:14
So it runs fine but I am not getting the expected results from the PowerShell script. — doorman
– doorman, Commented Jan 10, 2018 at 14:17

doorman · Accepted Answer · 2018-01-10 20:18:00Z

Finally I found a solution. Two things: This code solved the "is not recognized as a cmdlet, function, operable program, or script file bug. Thanks to Problem with calling a powershell function from c#

using (var runspace = RunspaceFactory.CreateRunspace())
{
    try
    {
        var script = File.ReadAllText("MyScript.ps1");
        runspace.Open();
        var ps = PowerShell.Create();
        ps.Runspace = runspace;
        ps.AddScript(script);
        ps.Invoke();
        ps.AddCommand("MyFunction").AddParameters(new Dictionary<string, string>
        {
            { "Param1" , value1},
            { "Param2", value2},
            { "Param3", value3},            
        });

        foreach (var result in ps.Invoke())
        {
        }
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.Message);
    }
}

Important, I also had to remove the process wrapper attribute from the script file

****MyScripts.ps1

    function MyFunction 
    {
        Param (
            [Parameter(Mandatory=$true)][string] myParam1,        
            [Parameter(Mandatory=$true)][string] myParam2,        
            [Parameter(Mandatory=$true)][string] myParam3,  
        )
        //  Removing the Process wrapper solved the problem, the code didn't run with it 
        Process {     
            //DOSTUFF
        }
    }

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