Running exe with parameters doesn't work

Question

var p = Process.Start(@"c:\PsTools\PsExec.exe", @"C:\Windows\System32\notepad.exe");
var err = p.StandardError.ReadToEnd();
var msg = p.StandardOutput.ReadToEnd();
lblStatusResponse.Text = "Err: " + err + "Msg: " + msg;

Why is my code not working?

I getting error:

System.InvalidOperationException: StandardError has not been redirected.

But when I add following:

p.StartInfo.RedirectStandardError = true;
var p = Process.Start(@"c:\PsTools\PsExec.exe", @"C:\Windows\System32\notepad.exe");) 

it still gets the same error.

The main problem is that I wanna execute a exe with arguments, but I can't get it to work.

Answer 1

The following code generates a new p, this ignoring the settings you change in the previous instance:

var p = Process.Start(@"c:\PsTools\PsExec.exe", @"C:\Windows\System32\notepad.exe");) 

So it doesn't really matter whether you initialize p like this

p.StartInfo.RedirectStandardError = true;

or not.

What you need to do

You need to create a ProcessStartInfo object, configure it and then pass it to Process.Start.

ProcessStartInfo p = new ProcessStartInfo(@"c:\PsTools\PsExec.exe", @"C:\Windows\System32\notepad.exe");
p.UseShellExecute = false;
p.RedirectStandardError = true;
p.RedirectStandardOutput = true;

Process proc = Process.Start(p);

var err = proc.StandardError.ReadToEnd();
var msg = proc.StandardOutput.ReadToEnd();