using System.Management.Automation;

using System;

using System.Collections.ObjectModel;

using System.Linq;

using System.Collections;

public class Program

{

    public static void Main()

    {   

        var powerShell = PowerShell.Create();

        powerShell.AddCommand("Get-PSProvider");

        Collection<PSObject> results = powerShell.Invoke();

        foreach (var result in results)

        {

           var drives = result.Properties["Drives"]?.Value == null ? new string[] { } : result.Properties["Drives"].Value as string[];         

           Console.WriteLine(drives.First());

​

           // Wokring Code

           //--------------

           // var drives = result.Properties["Drives"]?.Value == null ? new string[] { } : result.Properties["Drives"].Value;

           // var dri = ((IEnumerable)drives).Cast<object>()?.ToArray();        

           // Console.WriteLine(dri.First());

        }   

    }

}