Question

Assume I have created and opened runspace via

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

Let’s further assume that I want to add a variable into that runspace that is typed as an array by using the New-Variable cmdlet like so:

            // create a pipeline to add the variable into the runspace
            var pipeline = PowerShell.Create();
            // create a command object, add commands and parameters to it...
            var cmd = new PSCommand();
            cmd.AddCommand("New-Variable");
            cmd.AddParameter("Name", "foo");
            cmd.AddParameter("Value", "@()");
            // associate the command with the pipeline and runspace, and then invoke
            pipeline.Commands = cmd;
            pipeline.Runspace = rs;
            pipeline.Invoke();

The code works and I get no errors, but the variable ‘foo’ is not created as an array type. I’ve tried many different variations on “@()”, but none of them have panned out thus far. Ultimately, I think the question boils down to how to properly format the Value argument to New-Variable so that ‘foo’ will be interpreted as an empty PowerShell array type.

Thanks,

Matt

Answer 1

PSCommand.AddParameter takes a string for the parameter name, and an object for the parameter value. See the docs here.

You should put a “real” empty array, not a string representing the powershell script equivalent.

cmd.AddParameter("Value", new object[0]);