Error when redirecting StandardInput in C# Process

Question

I'm trying to redirect the standard input of a process in C#, but I'm encountering an error. Here's my code:

using System;
using System.Diagnostics;
using System.IO;

class Program
{
    static void Main()
    {
        string executablePath = "path/to/dist.exe";
        string file = "path/to/video.mp4";
        string fileName = Path.GetFileName(file);

        ExecuteExecutable(executablePath, file, fileName);
    }

    static void ExecuteExecutable(string executablePath, string file, string fileName)
    {
        ProcessStartInfo psi = new ProcessStartInfo
        {
            FileName = executablePath,
            UseShellExecute = false,
            RedirectStandardInput = true,
            RedirectStandardOutput = true,
            CreateNoWindow = true
        };

        Process process = new Process();
        process.StartInfo = psi;
        process.Start();

        process.StandardInput.WriteLine(file);
        process.StandardInput.WriteLine(fileName);

        process.WaitForExit();

        string output = process.StandardOutput.ReadToEnd();
        Console.WriteLine(output);
    }
}

I'm receiving an error when trying to write to the StandardInput stream of the process. The error message I'm getting is [: 'StandardIn has not been redirected.' ].

I've already set RedirectStandardInput to true and UseShellExecute to false in the ProcessStartInfo settings, but the error still persists. Any help or guidance on resolving this issue would be greatly appreciated.

Thank you in advance for your assistance!

The following may be of interest: https://stackoverflow.com/a/72818271/10024425 and https://stackoverflow.com/a/71846819/10024425 — Tu deschizi eu inchid, Jul 12 '23 at 16:00
On what OS? And did you elaborated that the process is actually running before trying to use the StandardInput? — Ralf, Jul 12 '23 at 16:06

score 0 · Accepted Answer · answered Jul 12 '23 at 16:58

0

You just need to add this line to your code:

pri.StartInfo.RedirectStandardInput = true;

answered Jul 12 '23 at 16:58

Frost Dream

1
2
13

It didn't solve my problem but it fixed the error so i accepted this answer. – Frost Dream Jul 12 '23 at 17:00

Error when redirecting StandardInput in C# Process

1 Answers1