Extract output from Powershell window to a string

Question

In my C# app, I have to run some PowerShell scripts. I copied paste from this site code about how to run the scripts.

My question: suppose I want to use the code from the link, how can I extract the PowerShell output to some string or to some .txt file?

EDIT:

If you want to test this code for answering this post, you need:

add reference to System.Management.Automation dll
add requireAdministrator inside app.manifest

Redirect it.. just like any other shell. That's a pretty bad article as a side-note. — Maximilian Burszley
– Maximilian Burszley, Commented Jun 2, 2018 at 13:53

Nehorai Elbaz · Accepted Answer · 2018-06-02 17:21:42Z

Based on this link, you can extract the output with Collection<PSObject> results = pipeline.Invoke();, here a code example, note this would extract the PowerShell output to StringBuiler and would hide the PowerShell window:

 string RunScript(string pathToYourScript){
RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();

            using (var runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration))
            {
                runspace.Open();
                runspace.SessionStateProxy.SetVariable("prog", this);

                using (Pipeline pipeline = runspace.CreatePipeline())
                {
                    if (!string.IsNullOrEmpty(path))
                        pipeline.Commands.AddScript(string.Format("$env:path = \"{0};\" + $env:path", pathToYourScript));

                    pipeline.Commands.AddScript(path);
                    pipeline.Commands.Add("Out-String");

                    Collection<PSObject> results = pipeline.Invoke();
                    StringBuilder stringBuilder = new StringBuilder();
                    foreach (PSObject obj in results)
                    {
                        stringBuilder.AppendLine(obj.ToString());

                    }

                    var outDefault = new Command("out-default");
                    outDefault.MergeMyResults(PipelineResultTypes.Error, PipelineResultTypes.Output);
                    pipeline.Commands.Add(outDefault);

                    return stringBuilder;
                    }

                }
            }

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