MVC 6, HomeControler Index() chiamato due volte

Question

Appena aggiornato a MVC 6 RC 1 e creato una nuova app MVC.

Trovato che il metodo di azione dell'indice viene chiamato due volte.

Index() in HomeControler:

public string Index() 
{ 
    System.Diagnostics.Debug.WriteLine("############################"); 
    return string.Empty; 
} 

ho tolto tutto da Startup.cs Configura tranne il comportamento di default.

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) 
{ 
    app.UseMvc(routes => 
    { 
     routes.MapRoute(
      name: "default", 
      template: "{controller=Home}/{action=Index}/{id?}"); 
    }); 
} 

Il layout globale viene rimosso. _ViewStart.cshtml

@{ 
    // Layout = "_Layout"; 
} 

L'output nel browser è vuoto. Nessun copione

uscita

Console:

'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.Extensions.Localization.Abstractions\1.0.0-rc1-final\lib\net451\Microsoft.Extensions.Localization.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.VisualStudio.Web.BrowserLink.Loader\14.0.0-rc1-final\lib\dnx451\Microsoft.VisualStudio.Web.BrowserLink.Loader.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.AspNet.WebUtilities\1.0.0-rc1-final\lib\net451\Microsoft.AspNet.WebUtilities.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
############################ 
############################ 
'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.AspNet.Http.Extensions\1.0.0-rc1-final\lib\net451\Microsoft.AspNet.Http.Extensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
The thread 0x70a4 has exited with code 0 (0x0). 

Stack di chiamate:

MvcTest1!MvcTest1.Controllers.HomeController.Index() Line 15 C# 
[Native to Managed Transition] 
[Managed to Native Transition] 
Microsoft.AspNet.Mvc.Core.dll!Microsoft.AspNet.Mvc.Controllers.ControllerActionExecutor.ExecuteAsync(System.Reflection.MethodInfo actionMethodInfo, object instance, object[] orderedActionArguments) Unknown 
Microsoft.AspNet.Mvc.Core.dll!Microsoft.AspNet.Mvc.Controllers.ControllerActionInvoker.InvokeActionAsync(Microsoft.AspNet.Mvc.Filters.ActionExecutingContext actionExecutingContext) Unknown 
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<Microsoft.AspNet.Mvc.Controllers.ControllerActionInvoker.<InvokeActionAsync>d__6>(ref Microsoft.AspNet.Mvc.Controllers.ControllerActionInvoker.<InvokeActionAsync>d__6 stateMachine) Unknown 
Microsoft.AspNet.Mvc.Core.dll!Microsoft.AspNet.Mvc.Controllers.ControllerActionInvoker.InvokeActionAsync(Microsoft.AspNet.Mvc.Filters.ActionExecutingContext actionExecutingContext) Unknown 
Microsoft.AspNet.Mvc.Core.dll!Microsoft.AspNet.Mvc.Controllers.FilterActionInvoker.InvokeActionFilterAsync() Unknown 
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<Microsoft.AspNet.Mvc.Controllers.FilterActionInvoker.<InvokeActionFilterAsync>d__53>(ref Microsoft.AspNet.Mvc.Controllers.FilterActionInvoker.<InvokeActionFilterAsync>d__53 stateMachine) Unknown 
Microsoft.AspNet.Mvc.Core.dll!Microsoft.AspNet.Mvc.Controllers.FilterActionInvoker.InvokeActionFilterAsync() Unknown 

EDIT

Trovato che il costruttore HomeControler viene chiamato due volte ??? Uscita

public class HomeController : Controller 
{ 
    public HomeController() 
    { 
     System.Diagnostics.Debug.WriteLine("CCCCCCCCCCCCCCCCCCCCCC"); 
    } 

    public string Index() 
    { 
     return string.Empty; 
    } 

Console:

'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.Extensions.Localization.Abstractions\1.0.0-rc1-final\lib\net451\Microsoft.Extensions.Localization.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.VisualStudio.Web.BrowserLink.Loader\14.0.0-rc1-final\lib\dnx451\Microsoft.VisualStudio.Web.BrowserLink.Loader.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.AspNet.WebUtilities\1.0.0-rc1-final\lib\net451\Microsoft.AspNet.WebUtilities.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
CCCCCCCCCCCCCCCCCCCCCC 
CCCCCCCCCCCCCCCCCCCCCC 
'dnx.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\Users\Miroslav\.dnx\packages\Microsoft.AspNet.Http.Extensions\1.0.0-rc1-final\lib\net451\Microsoft.AspNet.Http.Extensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
The thread 0x5d84 has exited with code 0 (0x0). 
The thread 0x7334 has exited with code 0 (0x0). 

EDIT 2

Probabilmente il problema appare solo in modalità debug:

public static class Counter 
{ 
    public static int CtrCalled { get; set; } 
    public static int IndexCalled { get; set; } 
} 

public class HomeController : Controller 
{ 
    public HomeController() 
    { 
     Counter.CtrCalled++; 
    } 

    public string Index() 
    { 
     Counter.IndexCalled++; 
     return $"Constructor called: {Counter.CtrCalled}, Index called: {Counter.IndexCalled}."; 
    } 
} 

uscita modalità Debug: Constructor called: 2, Index called: 1.

modalità debug con punti di debug: Constructor called: 2, Index called: 2.

uscita Uscita modalità: Constructor called: 1, Index called: 1.

Answer 1

Daniel Roth risposte:

Si tratta di VS l'invio di una richiesta separata per il debug di installazione. Se provi a eseguire l'app al di fuori di VS, non dovresti vedere questa richiesta extra.

Ulteriori discussioni qui: https://github.com/aspnet/Tooling/issues/261