.NET MVC – Illegal characters in path

Posted on May 5, 2020 by osco.se

Scenario
Render a ASP.NET MVC Razor view with a model from the controller.

Error / Exception
System.ArgumentException: Illegal characters in path.

Cause
The model from the controller was returning JSON and the view had declared “@model string” to handle the JSON.

Solution
Updates in both controller and view. Change controller return type from string to the object.

Controller
Original: return View(JsonConvert.SerializeObject(List));
Change to: return View(List);

View
Original: @model string
Change to: @model List<object>

Could not load file or assembly System.Web.WebPages.Razor

Posted on September 28, 2017 by osco.se

Suddenly got the error message when starting a MVC application:

Could not load file or assembly ‘System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.

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.IO.FileNotFoundException: Could not load file or assembly ‘System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.

[FileNotFoundException: Could not load file or assembly 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.]
   System.Web.Mvc.PreApplicationStartCode.Start() +0

[InvalidOperationException: The pre-application start initialization method Start on type System.Web.Mvc.PreApplicationStartCode threw an exception with the following error message: Could not load file or assembly 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified..]
   System.Web.Compilation.BuildManager.InvokePreStartInitMethodsCore(ICollection`1 methods, Func`1 setHostingEnvironmentCultures) +615
   System.Web.Compilation.BuildManager.InvokePreStartInitMethods(ICollection`1 methods) +141
   System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded) +102
   System.Web.Compilation.BuildManager.ExecutePreAppStart() +157
   System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +549

[HttpException (0x80004005): The pre-application start initialization method Start on type System.Web.Mvc.PreApplicationStartCode threw an exception with the following error message: Could not load file or assembly 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified..]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +10085804
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +95
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254

Solution

Run following command in the package manager console:
Update-Package Microsoft.AspNet.Mvc -Reinstall

Database entity model was generated with warnings or errors (asp.net)

Posted on June 29, 2016 by osco.se

Got some errors when trying to generate a DB entity model for a ASP.net MVC website. The error message was “The model was generated with warnings or errors. Please see the Error List for more details. These issues must be fixed before running your application”.

This turned to be caused by some tables that was lacking a primary key. Once a primary key was set on these tables the model could be generated successfully.

Entity type is not part of the model for current context

Posted on April 18, 2016 by osco.se

The entity type <Type> is not part of the model for the current context.

ExceptionType:
System.InvalidOperationException System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) vid System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) vid System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() vid System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext() --- Slut på stackspårningen från föregående plats där ett undantag utlöstes --- vid System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) vid System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) vid System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() vid System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext() --- Slut på stackspårningen från föregående plats där ett undantag utlöstes --- vid System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) vid System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) vid System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() vid System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()

Cause:
Wrong meta data in the MVC entity framework connection string. Had multiple entity models to seperate databases in the project. But had copied the connection strings to the other databases and changed the database settings and credentials. But forgot to update the entity model names in the meta data section of the connectionstring.

Solution:
Update database model names in the connection strings.

Local IIS failed to map the path ‘/’

Posted on January 12, 2016 by osco.se

Got an exception of System.InvalidOperationException: “Failed to map the path ‘/'” when starting the site on a local IIS.

System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +556

[HttpException (0x80004005): Det gick inte att mappa sökvägen /.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +579
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +118
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +730

——
With my modest knowledge about hosting a site on a local IIS the solution turned out to be really simple.

1. Start a new command prompt in administrator mode.
2. Run command: “iisreset”

TADA!

Call stored procedure via DBContext

Posted on September 20, 2015 by osco.se

Tried to call a SP via Entity framework (DBContext) but got a exception that parameter is not supplied.

My call looked like:
context.Database.ExecuteSqlCommand(“NameOfSP”, new SqlParameter(“@param1”, 1), new SqlParameter(“@param2”, DateTime.Now), new SqlParameter(“@param3”, “test”));

The right call should look like:
context.Database.ExecuteSqlCommand(“NameOfSP @p1, @p2, @p3”, new SqlParameter(“@p1”, 1), new SqlParameter(“@p2”, DateTime.Now), new SqlParameter(“@p3”, “test”));

You should include the parameter name after the name of the stored procedure.

ASP.NET MVC 6

Posted on November 24, 2014 by osco.se

Checkout the new MVC!

http://channel9.msdn.com/Events/dotnetConf/2014/MVC-6

Osco.se

A notebook
Is also seen at MSDN

Tag Archives: mvc