How to execute a PowerShell script using c#

Question

I need to execute a PowerShell script using c#

ProcessStartInfo startInfo = new ProcessStartInfo();
            startInfo.FileName = @"cmd.exe";
            startInfo.Arguments = @"powershell -File ""C:\Users\user1\Desktop\power.ps1""";
            startInfo.Verb = "runas";
            startInfo.RedirectStandardOutput = true;
            startInfo.RedirectStandardError = true;
            startInfo.UseShellExecute = false;
            startInfo.CreateNoWindow = true;
            Process process = new Process();
            process.StartInfo = startInfo;
            process.Start();
            process.WaitForExit();

This does not work. Can someone help me? I have a PowerShell script file and sometimes it will have arguments to pass

@LinkedListT nothing returns. process is stuck in waitforexit() code — Ijas, Apr 28 '20 at 17:45
trying something like this: https://stackoverflow.com/q/43855697/9936356 — LinkedListT, Apr 28 '20 at 17:51
You are writing invalid code. To use verb of `runas`, you must set `UseShellExecute` to `true`. So what exactly do you want to run as administrator? — Lex Li, Apr 28 '20 at 17:53
@LexLi if i remove it can i run .ps1 file like this? I don't know how to execute .ps1 file — Ijas, Apr 28 '20 at 17:56

score 3 · Answer 1 · answered Apr 28 '20 at 22:01

3

Running .ps1 from C# is a really common thing, with many examples all over the web and videos on Youtube showing how/with examples.

Call a Powershell script from c# code

public static int RunPowershellScript(string ps)
{
int errorLevel;
ProcessStartInfo processInfo;
Process process;

processInfo = new ProcessStartInfo("powershell.exe", "-File " + ps);
processInfo.CreateNoWindow = true;
processInfo.UseShellExecute = false;

process = Process.Start(processInfo);
process.WaitForExit();

errorLevel = process.ExitCode;
process.Close();

return errorLevel;
}

As well as see these stackoverflowthreads.

To call a PowerShell script file (example.ps1) from C#

When do we need to set UseShellExecute to True?

answered Apr 28 '20 at 22:01

postanote

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I tried this but i don't get expected output. My shell script contains code for creating a folder. process is executed and exit code got 1. but folder is not created. – Ijas Apr 29 '20 at 07:36
@ljas, you need elevated access. Try processInfo.Verb = "runas". Also, there will also be the issue where you the script you run has environment lines \n\r which are not read the right way in powershell....any ideas on how to make powershell read them as new arguments ? – NewBie1234 Jan 08 '21 at 12:45
@postanote, the link to many examples all over the web are only good if you don't need elevated access. I've looked all over and as of now, the only way to effectively run powershell as an administrator is by running your code above, with the verb "runas". The only issue is that it will only take one argument that way. – NewBie1234 Jan 08 '21 at 12:49

score 2 · Accepted Answer · answered Nov 06 '21 at 20:58

None of the answers here helped me but this answer did and was taken from this blog post so credit to the author.

https://duanenewman.net/blog/post/running-powershell-scripts-from-csharp/

Here's the full code that will run a PowerShell script when you create a console app in Visual Studio that will ByPass any restrictions.

Just change the ps1File variable to your needs below.

using System;
using System.Diagnostics;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {

            InstallViaPowerShell();
        }

       public static void InstallViaPowerShell()
        {

            var ps1File = @"C:\Users\stevehero\source\repos\RGB Animated Cursors PowerShell\RGB Animated Cursors\install-scheme.ps1";

            var startInfo = new ProcessStartInfo()
            {
                FileName = "powershell.exe",
                Arguments = $"-NoProfile -ExecutionPolicy ByPass -File \"{ps1File}\"",
                UseShellExecute = false
            };
            Process.Start(startInfo);

        }
    }
}

How to execute a PowerShell script using c#

2 Answers2