Example how to run powershell in .net 4.7 from C#

PSExecution.cs

namespace Web.Controllers
{
  public class PSExecution
  {
    public PSCommand PSCommand{get;set;}
    public string Output{get; private set;}
    
    public void SetOutput(string output){
      this.Output = output;
    }
  }
  
  public class PSCommand
  {
    public string Text{get;set;}
  }
}

RunPowerShellFromCSharp.cs

/*
Depends on nuget package: 

  <package id="System.Management.Automation" version="6.1.7601.17515" targetFramework="net47" />
  
*/

using System.Collections.ObjectModel;
using System.Management.Automation;
using System.Management.Automation.Runspaces;
using System.Text;


namespace Web.Controllers
{
    public class PS
    {
        /// <summary>
        /// Runs the script.
        /// </summary>
        /// <param name="scriptText">The script text.</param>
        /// <returns>string from output</returns>
        public PSExecution RunScript(PSExecution psExecution)
        {
            // create Powershell runspace
            Runspace runspace = RunspaceFactory.CreateRunspace();

            // open it
            runspace.Open();

            // create a pipeline and feed it the script text
            Pipeline pipeline = runspace.CreatePipeline();
            pipeline.Commands.AddScript(psExecution.PSCommand.Text);

            // add an extra command to transform the script
            // output objects into nicely formatted strings

            // "Get-Process" returns a collection
            // of System.Diagnostics.Process instances.
            pipeline.Commands.Add("Out-String");

            // execute the script
            Collection<PSObject> results = pipeline.Invoke();

            // close the runspace
            runspace.Close();

            // convert the script result into a single string
            StringBuilder stringBuilder = new StringBuilder();
            foreach (PSObject obj in results)
            {
                stringBuilder.AppendLine(obj.ToString());
            }

            psExecution.SetOutput(stringBuilder.ToString());

            return psExecution;
        }

    }
}