How to run command line with admin right in C#

Question

I have referenced some other topics and it comes up the following coding, yet it doesn't work. I allow it creates command window and use "/k" argument keeping the window opened so that I can trace its output.

However, I can see the warning from the window that the command needs admin rights to execute. How can I execute it in admin rights?

public void ClearArpCache () {
        ProcessStartInfo processStartInfo = new ProcessStartInfo("cmd.exe", "/user:Administrator \" cmd /k arp -d \""); // same as "netsh interface ip delete arpcache"
        processStartInfo.RedirectStandardOutput = true;
        //processStartInfo.CreateNoWindow = true;
        //processStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        processStartInfo.UseShellExecute = false;
        processStartInfo.StandardOutputEncoding = Encoding.Default;
        processStartInfo.Verb = "runas";

        Process.Start (processStartInfo);
        UnityEngine.Debug.Log ("ARP table cache cleared.");
    }

EDITED:

Try changing from "cmd.exe" to "runas.exe"

public void ClearArpCache () {
        ProcessStartInfo processStartInfo = new ProcessStartInfo("runas.exe", "/user:Administrator \" cmd /k arp -d \""); // same as "netsh interface ip delete arpcache"
        processStartInfo.RedirectStandardOutput = true;
        //processStartInfo.CreateNoWindow = true;
        //processStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        processStartInfo.UseShellExecute = false;
        processStartInfo.StandardOutputEncoding = Encoding.Default;

        Process.Start (processStartInfo);
        UnityEngine.Debug.Log ("ARP table cache cleared.");
    }

i *think* you should solve that beforehand by making sure your application has elevated UAC, see https://stackoverflow.com/questions/6412896/giving-application-elevated-uac — Timothy Groote, Aug 22 '17 at 09:32
/user:Administrator is not a listed set of params for cmd .. you sure you didnt mean runas? — BugFinder, Aug 22 '17 at 09:38
Thank you @BugFinder, I added "runas" in StartInfo, but it doesn't help. — Simon Leung, Aug 22 '17 at 09:45
runas as commented do the trick, check here for more info https://stackoverflow.com/questions/133379/elevating-process-privilege-programmatically — Thiago Loureiro, Aug 22 '17 at 09:50

score 1 · Answer 1 · answered Aug 22 '17 at 12:15

Just clarified why it failed using "runas". In order to use "runas" in Verb, UseShellExecute must be firstly turned true.

When executing following function, it will pop a window asking for admin rights, just click 'Yes' to begin the execution. Though it is beyond the scope, if possible I want to skip the pop-up window as well.

public void ClearArpCache () {
        ProcessStartInfo processStartInfo = new ProcessStartInfo("cmd.exe", "/k arp -d"); // same as "netsh interface ip delete arpcache"
        processStartInfo.CreateNoWindow = true;
        processStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        processStartInfo.UseShellExecute = true;
        processStartInfo.Verb = "runas";

        Process.Start (processStartInfo);
        UnityEngine.Debug.Log ("ARP table cache cleared.");
    }

If you don't like to get the UAC popup, you have to [disable it](https://www.howtogeek.com/howto/windows-vista/disable-user-account-control-uac-the-easy-way-on-windows-vista/). — Oliver, Aug 22 '17 at 12:32

How to run command line with admin right in C#

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