C# and Powershell sharing memory

Question

I have a Powershell script being executed from a C# program. Both use a C# dll with static memory. When the Powershell script is executed, it has access to the same data that the C# program set. Additionally, anything the Powershell script writes to the dll is available the next time the script is called.

I want them to be completely separate so that the Powershell script runs in its own environment and memory space.

Here is my code:

using ( var _powerShell = PowerShell.Create() )
            {
                try
                {
                    _powerShell.Runspace = null;
                    _powerShell.RunspacePool = null;
                    _powerShell.AddScript($"{scriptFile} {args}");
                    _powerShell.Invoke();
                }
                catch ( Exception ex )
                {
                    Console.WriteLine(ex.ToString());
                }
                finally
                {
                    _powerShell.Dispose();
                }
            }

I am guessing I need to create a new Powershell session or something? I'm stuck.

_powerShell.Runspace = RunspaceFactory.CreateOutOfProcessRunspace(null); — user4003407
– user4003407, Commented Apr 4, 2018 at 10:21

usr1 · Accepted Answer · 2018-05-30 01:52:11Z

Got the answer thanks to PetSerAI:

using ( _powerShell = PowerShell.Create() )
{
    try
    {
        var run = RunspaceFactory.CreateOutOfProcessRunspace(null);
        run.Open();
        _powerShell.Runspace = run;
        _powerShell.AddScript($"{scriptFile} {args}");
        _powerShell.Invoke();
    }
    catch ( Exception ex )
    {
        //do stuff
    }
}

update: So there is a bug in the above code... the newly crated runspace is not released until the end of the program. I had this code being called multiple times, which resulted in a hundred background powershell instances. Here is the fix:

using ( var run = RunspaceFactory.CreateOutOfProcessRunspace(null) )
{
    run.Open();
    using ( _powerShell = PowerShell.Create() )
    {
        try
        {
            _powerShell.Runspace = run;
            _powerShell.AddScript($"{scriptFile} {args}");
            _powerShell.Invoke();
        }
        catch ( Exception ex )
        {
            //do stuff
        }
    }
}

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