Develop Reference

Getting the error of a Powershell Script within c# and outputting it with conditional statement?

I have a console application and a method that executes a PowerShell script within the console application. So I'm trying to grab an error text that it outputs in the application and do something with it.
Example/What I'm trying to do:
If Error.contains("Object")
{
// do something here
}
Here is my current method
public void ExecutePowershellScript()
{
var file = #"C:\Path\filename.ps1";
var start = new ProcessStartInfo()
{
FileName = "powershell.exe",
Arguments = $"-NoProfile -ExecutionPolicy unrestricted -file \"{file}\"",
UseShellExecute = false
};
Process.Start(start);
}

Process.start: how to get the output?
When you create your Process object set StartInfo appropriately:
var proc = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = "program.exe",
Arguments = "command line arguments to your executable",
UseShellExecute = false,
RedirectStandardOutput = true,
CreateNoWindow = true
}
};
then start the process and read from it:
proc.Start();
while (!proc.StandardOutput.EndOfStream)
{
string line = proc.StandardOutput.ReadLine();
// do something with line
}
You can use int.Parse() or int.TryParse() to convert the strings to numeric values. You may have to do some string manipulation first if there are invalid numeric characters in the strings you read.

You can set RedirectStandardError = true and access any errors from process.StandardError
public static void ExecutePowershellScript()
{
var file = #"C:\Path\filename.ps1";
var start = new ProcessStartInfo()
{
FileName = "powershell.exe",
Arguments = $"-NoProfile -ExecutionPolicy unrestricted -file \"{file}\"",
UseShellExecute = false,
RedirectStandardOutput = true,
RedirectStandardError = true
};
using Process process = Process.Start(start);
string output = process.StandardOutput.ReadToEnd();
string errors = process.StandardError.ReadToEnd();
}
Okay, scratch the above suggestion.
After being corrected by mklement0,
This is a perfectly reasonable attempt, but, unfortunately, it can lead to hangs (while waiting for one's stream end, the other, when exceeding the buffer size, may cause process execution to block). If you need to capture both streams, you must collect the output from one of them via events. – mklement0
I changed the solution to use the ErrorDataReceived event
public static async Task ExecutePowershellScript()
{
var file = #"C:\Path\filename.ps1";
var start = new ProcessStartInfo
{
FileName = "powershell.exe",
Arguments = $"-NoProfile -ExecutionPolicy unrestricted -file \"{file}\"",
UseShellExecute = false,
// redirect standard error stream to process.StandardError
RedirectStandardError = true
};
using var process = new Process
{
StartInfo = start
};
// Subscribe to ErrorDataReceived event
process.ErrorDataReceived += (sender, e) =>
{
// code to process the error lines in e.Data
};
process.Start();
// Necessary to start redirecting errors to StandardError
process.BeginErrorReadLine();
// Wait for process to exit
await process.WaitForExitAsync();
}

start.Start();
while (!start.StandardOutput.EndOfStream)
{
string line = start.StandardOutput.ReadLine();
}

How to take window ID of a created process in c#?

I am working on a C# .net core project.I created a process to run "xdotool windowactivate $windowpid".I should store the windowID which process run on it.The solution could be any property of xdotool which i couldn't find,or Is there any way to take windowId of a process when it is created?
Another Try is that:
I created my pages with this method. I tried to take mainwindowtitle of process;because of single process,i couldn't take the titles.
static List<string> chromeTitles = new List<string>();
public static Process StartChrome(string filePath)
{
string dataDirectory = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Chrome-UserData");
filePath += " --user-data-dir=" + dataDirectory;
var Chrome = new Process
{
StartInfo =
{
FileName = "C:/Program/chrome.exe",
Arguments = filePath,
UseShellExecute = false,
CreateNoWindow=true,
WindowStyle = ProcessWindowStyle.Maximized,
}
};
Chrome.Start();
string title = Chrome.MainWindowTitle;
chromeTitles.Add(title);
}
Then I call it :
StartChrome("https://tr.wikipedia.org/wiki/Anasayfa");
Thread.Sleep(2000);
StartChrome("https://tureng.com/");

You can use the Process class for accessing more capabilities.
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.FileName = "xdotool.exe";
startInfo.UseShellExecute = false;
startInfo.RedirectStandardOutput = true;
startInfo.Arguments = $"windowactivate $windowpid";
process.StartInfo = startInfo;
process.Start();
To get the PID of the process that got run by the code, you can use Process.ID property:
process.Id;
if you want to read the output, you can add this code:
string output = process.StandardOutput.ReadToEnd();
To get Output, startInfo.RedirectStandardOutput should be True.

How do I check if a command prompt command executes valid? [duplicate]

This question already has answers here:
How To: Execute command line in C#, get STD OUT results
(18 answers)
Closed 1 year ago.
So I want to check if node.js is installed using c# by using this code.
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
startInfo.FileName = "cmd.exe";
startInfo.Arguments = "/C node -v";
process.StartInfo = startInfo;
process.Start();
I'm not sure how to check if the command ran successfully. Is it possible in c# and if it is how?

Set StartInfo appropiately and redirects the standard output.
var proc = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = "cmd.exe",
Arguments = "/C node -v",
UseShellExecute = false,
RedirectStandardOutput = true,
CreateNoWindow = true
}
};
// Starts the process and reads its output.
proc.Start();
string output = proc.StandardOutput.ReadToEnd();

How to execute a terminal command in Xamarin.Mac and read-in its output

We are writing a Xamarin.Mac application. We need to execute a command like "uptime" and read it's output into an application to parse.
Could this be done? In Swift and Objective-C there is NTask, but I don't seem to be able to find any examples in C#.

Under Mono/Xamarin.Mac, you can the "standard" .Net/C# Process Class as the Process gets mapped to the underlaying OS (OS-X For Mono, MonoMac and Xamarin.Mac, and Mono for *nix).
Process p = new Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "Write500Lines.exe";
p.Start();
// To avoid deadlocks, always read the output stream first and then wait.
string output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
Xamarin: https://developer.xamarin.com/api/type/System.Diagnostics.Process/
MSDN: https://msdn.microsoft.com/en-us/library/system.diagnostics.processstartinfo.redirectstandardoutput%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
Example from my OS-X C# code, but it is cross-platform as it works as is under Windows/OS-X/Linux, just the executable that you are running changes across the platforms.
var startInfo = new ProcessStartInfo () {
FileName = Path.Combine (commandPath, command),
Arguments = arguments,
UseShellExecute = false,
CreateNoWindow = true,
RedirectStandardOutput = true,
RedirectStandardError = true,
RedirectStandardInput = true,
UserName = System.Environment.UserName
};
using (Process process = Process.Start (startInfo)) { // Monitor for exit}
process.WaitForExit ();
using (var output = process.StandardOutput) {
Console.Write ("Results: {0}", output.ReadLine ());
}
}

Here is an example taken from Xamarin forum:
var pipeOut = new NSPipe ();
var t = new NSTask();
t.LaunchPath = launchPath;
t.Arguments = launchArgs;
t.StandardOutput = pipeOut;
t.Launch ();
t.WaitUntilExit ();
t.Release ();
var result = pipeOut.ReadHandle.ReadDataToEndOfFile ().ToString ();

C# CMD with command not executed [duplicate]

In C# WPF: I want to execute a CMD command, how exactly can I execute a cmd command programmatically?

Here's a simple example :
Process.Start("cmd","/C copy c:\\file.txt lpt1");

As mentioned by the other answers you can use:
Process.Start("notepad somefile.txt");
However, there is another way.
You can instance a Process object and call the Start instance method:
Process process = new Process();
process.StartInfo.FileName = "notepad.exe";
process.StartInfo.WorkingDirectory = "c:\temp";
process.StartInfo.Arguments = "somefile.txt";
process.Start();
Doing it this way allows you to configure more options before starting the process. The Process object also allows you to retrieve information about the process whilst it is executing and it will give you a notification (via the Exited event) when the process has finished.
Addition: Don't forget to set 'process.EnableRaisingEvents' to 'true' if you want to hook the 'Exited' event.

if you want to start application with cmd use this code:
string YourApplicationPath = "C:\\Program Files\\App\\MyApp.exe"
ProcessStartInfo processInfo = new ProcessStartInfo();
processInfo.WindowStyle = ProcessWindowStyle.Hidden;
processInfo.FileName = "cmd.exe";
processInfo.WorkingDirectory = Path.GetDirectoryName(YourApplicationPath);
processInfo.Arguments = "/c START " + Path.GetFileName(YourApplicationPath);
Process.Start(processInfo);

Using Process.Start:
using System.Diagnostics;
class Program
{
static void Main()
{
Process.Start("example.txt");
}
}

How about you creat a batch file with the command you want, and call it with Process.Start
dir.bat content:
dir
then call:
Process.Start("dir.bat");
Will call the bat file and execute the dir

You can use this to work cmd in C#:
ProcessStartInfo proStart = new ProcessStartInfo();
Process pro = new Process();
proStart.FileName = "cmd.exe";
proStart.WorkingDirectory = #"D:\...";
string arg = "/c your_argument";
proStart.Arguments = arg;
proStart.WindowStyle = ProcessWindowStyle.Hidden;
pro.StartInfo = pro;
pro.Start();
Don't forget to write /c before your argument !!

Argh :D not the fastest
Process.Start("notepad C:\test.txt");

Are you asking how to bring up a command windows? If so, you can use the Process object ...
Process.Start("cmd");

You can do like below:
var command = "Put your command here";
System.Diagnostics.ProcessStartInfo procStartInfo = new System.Diagnostics.ProcessStartInfo("cmd", "/c " + command);
procStartInfo.RedirectStandardOutput = true;
procStartInfo.UseShellExecute = false;
procStartInfo.WorkingDirectory = #"C:\Program Files\IIS\Microsoft Web Deploy V3";
procStartInfo.CreateNoWindow = true; //whether you want to display the command window
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo = procStartInfo;
proc.Start();
string result = proc.StandardOutput.ReadToEnd();
label1.Text = result.ToString();

In addition to the answers above, you could use a small extension method:
public static class Extensions
{
public static void Run(this string fileName,
string workingDir=null, params string[] arguments)
{
using (var p = new Process())
{
var args = p.StartInfo;
args.FileName = fileName;
if (workingDir!=null) args.WorkingDirectory = workingDir;
if (arguments != null && arguments.Any())
args.Arguments = string.Join(" ", arguments).Trim();
else if (fileName.ToLowerInvariant() == "explorer")
args.Arguments = args.WorkingDirectory;
p.Start();
}
}
}
and use it like so:
// open explorer window with given path
"Explorer".Run(path);
// open a shell (remanins open)
"cmd".Run(path, "/K");