Call a Console App from ASP.NET MVC, but don't want to wait for the response

Question

I am trying to achieve something like this.

    private Process p;

    //
    // GET: /Home/
    [HttpGet]
    public ActionResult Index()
    {
        return View(new Contents() { Text = "Hello" });
    }

    [HttpPost]
    public ActionResult Processing()
    {
        // Get the file path of your Application (exe)
        string filePath = @"Z:\Junk\MVCtoConsole\Sample Console App\bin\Debug\Sample Console App.exe";

        ProcessStartInfo info = new ProcessStartInfo(filePath);
        info.RedirectStandardOutput = true;
        info.UseShellExecute = false;

        p = Process.Start(info);
        p.WaitForExit(1);

        Session["pid"] = p.Id;

        return View("Index", new Contents() { Text = "Processing" });
    }

    [HttpPost]
    public ActionResult Kill()
    {
        int pid = (int)Session["pid"];

        p = Process.GetProcessById(pid);

        p.Kill();

        return View("Index", new Contents() { Text = "Killed" });
    }

    public ActionResult Update()
    {
        int pid = (int)Session["pid"];

        p = Process.GetProcessById(pid);

        return View("Index", new Contents() { Text = p.StandardOutput.ReadToEnd() });
    }

But I get the following errors when calling the update view...

Server Error in '/' Application.

StandardOut has not been redirected or the process hasn't started yet.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: StandardOut has not been redirected or the process hasn't started yet.

Source Error:

Line 56: p = Process.GetProcessById(pid); Line 57: Line 58: return View("Index", new Contents() { Text = p.StandardOutput.ReadToEnd() }); Line 59: } Line 60: }

Source File: Z:\\Junk\\MVCtoConsole\\MVCtoConsole\\Controllers\\HomeController.cs Line: 58

Stack Trace:

[InvalidOperationException: StandardOut has not been redirected or the process hasn't started yet.]
System.Diagnostics.Process.get_StandardOutput() +1172937 MVCtoConsole.Controllers.HomeController.Update() in Z:\\Junk\\MVCtoConsole\\MVCtoConsole\\Controllers\\HomeController.cs:58 lambda_method(ExecutionScope , ControllerBase , Object[] ) +40
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary 2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2 parameters) +24
System.Web.Mvc.<>c_ DisplayClassd.b _a() +52 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func 1 continuation) +254 System.Web.Mvc.<>c__DisplayClassf.<InvokeActionMethodWithFilters>b__c() +19 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList 1 filters, ActionDescriptor actionDescriptor, IDictionary 2 parameters) +192
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +314 System.Web.Mvc.Controller.ExecuteCore() +105 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +39
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21 System.Web.Mvc.Async.<>c__DisplayClass8 2 parameters) +192
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +314 System.Web.Mvc.Controller.ExecuteCore() +105 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +39
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21 System.Web.Mvc.Async.<>c__DisplayClass8 2 parameters) +192
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +314 System.Web.Mvc.Controller.ExecuteCore() +105 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +39
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21 System.Web.Mvc.Async.<>c__DisplayClass8 1.b__7(IAsyncResult _) +12 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +59 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +44
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8690318 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Version Information: Microsoft .NET Framework Version:2.0.50727.5446; ASP.NET Version:2.0.50727.5420

Any Ideas as to how this can be achieved?

Oh my console app isn't doing very much just now, as I am just trying to find out if this will work.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace Sample_Console_App
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Triggered");

            for (int i = 0; i < 100000; i = i + 100)
            {
                Console.WriteLine(i);
                Thread.Sleep(1000);
            }
        }
    }
}

Answer 1

You need to set also

p.UseShellExecute = False

Sorry didn't saw that you already set it

you should check p state before asking for output could be already ended by that time