Capturar salida del proceso mediante el evento OutputDataReceived

Question

Estoy tratando de capturar la salida del proceso en "tiempo real" (mientras se está ejecutando). El código que uso es bastante simple (ver a continuación). Por algún extraño motivo, nunca se llama al evento OutputDataReceived. ¿Por qué?

private void button2_Click(object sender, EventArgs e) 
    { 
     // Setup the process start info 
     var processStartInfo = new ProcessStartInfo("ping.exe", "-t -n 3 192.168.100.1") 
     { 
     UseShellExecute = false, 
     RedirectStandardOutput = true 
     }; 

     // Setup the process 
     mProcess = new Process { StartInfo = processStartInfo, EnableRaisingEvents = true }; 

     // Register event 
     mProcess.OutputDataReceived += OnOutputDataReceived; 

     // Start process 
     mProcess.Start(); 
     mProcess.WaitForExit(); 
    } 

    void OnOutputDataReceived(object sender, DataReceivedEventArgs e) 
    { 
     //Never gets called... 
    } 

Answer 1

es necesario llamar a

mProcess.BeginOutputReadLine(); 

BeginOutputReadLine - "Comienza operaciones de lectura asíncronas en el flujo de StandardOutput redirigida de la aplicación."

Answer 2

void ExecuteCommand(string cmdpath, string cmdargs) 
{ 
    string command = cmdpath + " " + cmdargs; 

    tabc_results.SelectTab(1); 
    DoConsole("\r\nCmd>> " + command + "\r\n"); 

    var processInfo = new System.Diagnostics.ProcessStartInfo("cmd.exe", "/c " + command); 
    processInfo.CreateNoWindow = true; 
    processInfo.UseShellExecute = false; 
    processInfo.RedirectStandardError = true; 
    processInfo.RedirectStandardOutput = true; 

    var process = System.Diagnostics.Process.Start(processInfo); 

    process.OutputDataReceived += (
     object sender, System.Diagnostics.DataReceivedEventArgs e 
    ) => DoConsole("stdout>> " + e.Data + "\r\n"); 
    //Console.WriteLine("output>>" + e.Data); 
    process.BeginOutputReadLine(); 

    process.ErrorDataReceived += (
     object sender, System.Diagnostics.DataReceivedEventArgs e 
    ) =>DoConsole("stderr>> " + e.Data + "\r\n"); 
    //Console.WriteLine("error>>" + e.Data); 
    process.BeginErrorReadLine(); 

    process.WaitForExit(); 

    DoConsole("retcode>> " + process.ExitCode.ToString() + "\r\n"); 
    //Console.WriteLine("ExitCode: {0}", process.ExitCode); 
    process.Close(); 
}