Visual studio при запуске выбранного генератора кода произошла ошибка

I’m creating a new view off of a model.
The error message I am getting is

Error
There was an error running the selected code generator:
‘Access to the path
‘C:UsersXXXXXXXAppDataLocalTempSOMEGUIDEntityFramework.dll’ is denied’.

I am running VS 2013 as administrator.

I looked at Is MvcScaffolding compatible with VS 2013 RC by command line? but this didn’t seem to resolve the issue.

VS2013
C#5
MVC5
Brand new project started in VS 2013.

I have the exact same problem.
First encountered this while following along the Pluralsight Course «Parent-Child Data with EF, MVC, Knockout, Ajax, and Validation».

I am using MVC 5, EF 6.1.1 and framework 4.5.2.

Even after updating my VS2013 to update 4, this error still persisted.

Was able to circumvent this annoying problem by changing the DbSet to IDbSet inside the DbContext class.
Answer was originally from here.

//From
public DbSet SalesOrders { get; set; }

//To
public IDbSet SalesOrders { get; set; }

What worked for me to resolve this: Close Solution, And open the project by clicking project file and not the solution file, add your controller, and bobs your uncle

answered Nov 21, 2013 at 9:15

I had this problem when trying to add an Api Controller to my MVC ASP.NET web app for a completely different reason than the other answers given. I had accidentally included a StringLength attribute with an IndexAttribute declaration for an integer property due to a copy and paste operation:

[Index]
[IndexAttribute("NumTrainingPasses", 0), StringLength(50)]
public int NumTrainingPasses { get; set; }

Once I got rid of the IndexAttribute declaration I was able to add an Api Controller for the Model that contained the offending property (NumTrainingPasses).

To help the search engines, here is the full error message I got before I fixed the problem:

There was an error running the selected code generator:

Unable to retrieve metadata for ‘Owner.Models.MainRecord’. The property
‘NumTrainingPasses’ is not a String or Byte array. Length can only be
configured for String or Byte array properties.

answered Jul 15, 2015 at 20:10

This is usually related to a format of your Web.config

Rebuild solution and lookup under Errors, tab Messages.
If you have any format problems with a web.config you will see it there.
Fix it and try again.

Example: I had connectionstring instead of connectionString

My issue was similar to many experience here, generic error message when trying to add a new view or use scaffolding to add a new controller.

I found out that MVC 5 and EF 6 modelbuilder are not good friends:

My Solution:

1. Comment out modelBuilder in your Context class.
2. Clean Solution, Rebuild Solution.
3. Add view and Controller via scaffolding
4. Uncomment modelbuilder.

answered Feb 3, 2014 at 14:45

answered Dec 6, 2014 at 6:53

I am also having this issue with MSVS2013 Update 4 and EF 6.0
The message I was getting was:

    there was an error running the selected code generator.
A configuration for type XXXX has already been added ...[]

I have a model with around 10 classes. I scaffolded elements at the beginning of the project with no problems.

After some days adding functionality, I tried to scaffold another class from the model, but an error was keeping me from doing it.

I have tried to update MSVS from update 2 to update 4, comment out my OnModelCreating method and other ideas proposed with no luck.

As a temporary way to continue with the project, I created a different asp.net project, pasted there my model classes (I am using fluent api, so there is little annotation on them) and successfully created my controller and views.

After that, I pasted back the created classes to the original project and corrected some mistakes (mainly dbset names).

It seems to be working, although I suppose that I will still find mistakes related to relationships between classes (due to the lack of fluent configuration when created).

I hope this helps to other users.

answered Feb 25, 2015 at 12:05

This happened to me when I attempted to create a new scaffold outside of the top level folder for a given Area.

• MyArea
  | — File.cs (tried to create a new scaffold here. Failure.)

I simply re-selected my area and the problem went away:

• AyArea (Add => new scaffold item)

Note that after scaffold generation you are taken to a place where you will not be able to create a new scaffold without re-selecting the area first (in VS 2013 at least).

answered Apr 20, 2015 at 15:51

• vs2013 update 4
• ef 5.0.0
• ibm db2connector 10.5 fp 5

change the web.config file as such:
removed the provider/s from ef tag:

<entityFramework>
</entityFramework>

added connection string tags under config sections:

</configSections>
<connectionStrings>
<add name=".." connectionString="..." providerName="System.Data.EntityClient" />
</connectionStrings>

answered Jun 28, 2015 at 4:02

answered Nov 15, 2015 at 11:02

In my case, I was trying to scaffold Identity elements and none of the above worked. The solution was simply to open Visual Studio with Administrator privileges.

Rebuild the solution works for me. before rebuild, I find references number of my ‘ApplicationDbContext’ is zero, that is impossible, so rebuild solution, everything is OK now.

answered Mar 27, 2019 at 9:51

It may be due to differences in the versions of nuget packages. See if you have this by going to dependencies->nuget packages folder in your solution. Try installing all of them of a single version and restart the visual studio after cleaning the componentmodelcache folder as mentioned above. This should the get the work done for you.

I’m creating a new view off of a model.
The error message I am getting is

Error
There was an error running the selected code generator:
‘Access to the path
‘C:UsersXXXXXXXAppDataLocalTempSOMEGUIDEntityFramework.dll’ is denied’.

I am running VS 2013 as administrator.

I looked at Is MvcScaffolding compatible with VS 2013 RC by command line? but this didn’t seem to resolve the issue.

VS2013
C#5
MVC5
Brand new project started in VS 2013.

I have the exact same problem.
First encountered this while following along the Pluralsight Course «Parent-Child Data with EF, MVC, Knockout, Ajax, and Validation».

I am using MVC 5, EF 6.1.1 and framework 4.5.2.

Even after updating my VS2013 to update 4, this error still persisted.

Was able to circumvent this annoying problem by changing the DbSet to IDbSet inside the DbContext class.
Answer was originally from here.

//From
public DbSet SalesOrders { get; set; }

//To
public IDbSet SalesOrders { get; set; }

What worked for me to resolve this: Close Solution, And open the project by clicking project file and not the solution file, add your controller, and bobs your uncle

answered Nov 21, 2013 at 9:15

I had this problem when trying to add an Api Controller to my MVC ASP.NET web app for a completely different reason than the other answers given. I had accidentally included a StringLength attribute with an IndexAttribute declaration for an integer property due to a copy and paste operation:

[Index]
[IndexAttribute("NumTrainingPasses", 0), StringLength(50)]
public int NumTrainingPasses { get; set; }

Once I got rid of the IndexAttribute declaration I was able to add an Api Controller for the Model that contained the offending property (NumTrainingPasses).

To help the search engines, here is the full error message I got before I fixed the problem:

There was an error running the selected code generator:

Unable to retrieve metadata for ‘Owner.Models.MainRecord’. The property
‘NumTrainingPasses’ is not a String or Byte array. Length can only be
configured for String or Byte array properties.

answered Jul 15, 2015 at 20:10

This is usually related to a format of your Web.config

Rebuild solution and lookup under Errors, tab Messages.
If you have any format problems with a web.config you will see it there.
Fix it and try again.

Example: I had connectionstring instead of connectionString

My issue was similar to many experience here, generic error message when trying to add a new view or use scaffolding to add a new controller.

I found out that MVC 5 and EF 6 modelbuilder are not good friends:

My Solution:

1. Comment out modelBuilder in your Context class.
2. Clean Solution, Rebuild Solution.
3. Add view and Controller via scaffolding
4. Uncomment modelbuilder.

answered Feb 3, 2014 at 14:45

answered Dec 6, 2014 at 6:53

I am also having this issue with MSVS2013 Update 4 and EF 6.0
The message I was getting was:

    there was an error running the selected code generator.
A configuration for type XXXX has already been added ...[]

I have a model with around 10 classes. I scaffolded elements at the beginning of the project with no problems.

After some days adding functionality, I tried to scaffold another class from the model, but an error was keeping me from doing it.

I have tried to update MSVS from update 2 to update 4, comment out my OnModelCreating method and other ideas proposed with no luck.

As a temporary way to continue with the project, I created a different asp.net project, pasted there my model classes (I am using fluent api, so there is little annotation on them) and successfully created my controller and views.

After that, I pasted back the created classes to the original project and corrected some mistakes (mainly dbset names).

It seems to be working, although I suppose that I will still find mistakes related to relationships between classes (due to the lack of fluent configuration when created).

I hope this helps to other users.

answered Feb 25, 2015 at 12:05

This happened to me when I attempted to create a new scaffold outside of the top level folder for a given Area.

• MyArea
  | — File.cs (tried to create a new scaffold here. Failure.)

I simply re-selected my area and the problem went away:

• AyArea (Add => new scaffold item)

Note that after scaffold generation you are taken to a place where you will not be able to create a new scaffold without re-selecting the area first (in VS 2013 at least).

answered Apr 20, 2015 at 15:51

• vs2013 update 4
• ef 5.0.0
• ibm db2connector 10.5 fp 5

change the web.config file as such:
removed the provider/s from ef tag:

<entityFramework>
</entityFramework>

added connection string tags under config sections:

</configSections>
<connectionStrings>
<add name=".." connectionString="..." providerName="System.Data.EntityClient" />
</connectionStrings>

answered Jun 28, 2015 at 4:02

answered Nov 15, 2015 at 11:02

In my case, I was trying to scaffold Identity elements and none of the above worked. The solution was simply to open Visual Studio with Administrator privileges.

Rebuild the solution works for me. before rebuild, I find references number of my ‘ApplicationDbContext’ is zero, that is impossible, so rebuild solution, everything is OK now.

answered Mar 27, 2019 at 9:51

It may be due to differences in the versions of nuget packages. See if you have this by going to dependencies->nuget packages folder in your solution. Try installing all of them of a single version and restart the visual studio after cleaning the componentmodelcache folder as mentioned above. This should the get the work done for you.

I’m following a video tutorial where I’m required to create an empty ASP.NET Web Application with MVC, using Visual Studio 2015, being new to ASP.NET world, I’m following step by step.

I got my project created well, next step adding a View from an existing Controller, I got hit by a messagebox error saying :

Error :
There was an error running the selected code generator:
‘Invalid pointer (Exception from HRESULT:0x80004003(E_POINTER))’

I Googled the problem, found similar issues, but none led to a clear solution, some similar problems were issued by anterior version of VisualStudio, but as I said none with a clear solution.

To clarify what I experienced, here’s what I’ve done step by step :

Chosen a ASP.NET Web Application :

Chosen Empty Template with MVC checked :

Tried to Add View from a Controller :

Some settings …

The Error :

What’s causing this problem and What is the solution for it ?

Update :

It turns out that even by trying to add the View manually I get the same error, adding a view is all ways impossible !

asked Jan 25, 2016 at 12:25

Lets assume you are using a datacontext in a DLL, well, it was my case, and I dont know why I have the same error that you describe, I solve it creating a datacontextLocal on the backend project. then I pass the Dbset to the correct datacontext and delete the local (you can let it there if you want, can be helpfull in the future

if you ready are using it in local datacontext, create a new one and then pass the Dbset to the correct one

answered Sep 29, 2017 at 11:59

In ASP.NET Core check if you have the Microsoft.VisualStudio.Web.CodeGeneration.Tools nuget package and it corresponds to your project version.

C:Users{WindowsUser}AppDataLocalMicrosoftVisualStudio16.0_8183e7d1ComponentModelCache

Remove from this folder for VS 2019 ….

answered Aug 30, 2019 at 17:01

answered Dec 18, 2019 at 20:11

answered Jun 15, 2017 at 14:51

answered Mar 21, 2018 at 18:00

Try clearing the ComponentModelCache,

1.Close Visual Studio

2.Delete everything in this folder C:UsersAppDataLocalMicrosoftVisualStudio14.0ComponentModelCache

3.Restart Visual Studio

4.Check again

this also used VS2017 to get solution

answered May 28, 2018 at 20:04

I ran into a similar issue that prevented the code generation from working. Apparently, my metadata had unknown properties or values. I must admit I did not try all the answers here but who really wants to reinstall vs or download any of the numerous Nuget packages being used.

Cleaning the project worked for me (Build->Clean Solution) The generator was using some outdated binaries to build the controller and views. Cleaning the solution removed the outdated binaries and voilà.

answered Aug 28, 2018 at 21:56

I’m currently trying to familiarise myself with MVC 4. I’ve been developing with MVC 5 for a while, but I need to know MVC 4 to study for my MCSD certification. I’m following a tutorial via Pluralsight, targeting much older versions of Entity Framework, and MVC, (the video was released in 2013!)

I hit this exact same error 2 hours ago and have been tearing my hair out trying to figure out what is wrong. Thankfully, because the project in this tutorial is meaningless, I was able to step backward throughout the process to figure out what it was that was causing the object ref not set error, and fix it.

What I found was an error within the structure of my actual solution.

I had a MVC web project set up (‘ASP.NET Web Application (.NET Framework)‘), but I also had 2 class libraries, one holding my Data Access Layer, and one holding the domain setup for models connecting to my database.

These were both of type ‘Class Library (.NET Standard)‘.

The MVC project did not like this.

Once I created new projects of type ‘Class Library (.NET Framework)’, and copied all the files from the old libraries to the new ones and fixed the reference for the MVC web project, a rebuild and retry allowed me to scaffold the View correctly.

This may seem like an obvious fix, don’t put a .NET Standard project alongside a .NET Framework one and expect it to work normally, but it may help others fix this issue!

answered Aug 31, 2018 at 13:58

My problem was the Types used in the Model Class.

Using the Types like this:

    [NotMapped]
    [Display(Name = "Image")]
    public HttpPostedFileBase ImageUpload { get; set; }


    [NotMapped]
    [Display(Name = "Valid from")]
    public Nullable<DateTime> Valid { get; set; }


    [NotMapped]
    [Display(Name = "Expires")]
    public Nullable<DateTime> Expires { get; set; }

No longer works in the Code Generator. I had to remove these types and scaffold without them, then add them later.

It is silly, [NotMapped] used to work when scaffolding.

Use the base Types: int, string, byte, and so on without Types like: DateTime, List, HttpPostedFileBase and so on.

answered Mar 19, 2019 at 20:55

answered May 18, 2019 at 17:04

answered Sep 19, 2019 at 4:12

answered Oct 16, 2019 at 2:58

answered Oct 23, 2019 at 7:38

answered Dec 16, 2019 at 16:54

answered Jul 27, 2020 at 10:27

answered Apr 23, 2021 at 5:46

answered May 23, 2021 at 13:37

answered Apr 17, 2022 at 6:51

So, i had this problem in vs2019.

• none of the other suggestions helped me

This is what fixed me:

• upgrade .net 5.0 dependencies to 5.0.17

answered Sep 8, 2022 at 13:41

I had similar proble to this one. I went through 2 appraches for solving this.

First Approach: Not The Best One…

I had created a project on VS2019, and tried to add a controller using VS2022. Not possible. I’d get an error every time.

Error ... Parameter name: searchFolder

Only from VS2019 I’d be able to scaffold the controller I needed. Not the best solution really… But it worked nevertheless.

You could try adding what you need from a different VS version.

Second Approach: The Best One

After further research I found this solution.

From Visual Studio Installer, I added the following components to my VS22 installation:

.NET Framework project and item templates

This made possible to add the controller I needed on VS22.

I know this solution does not point exactly to your problem, but it’s maybe a good lead to it. Like you, when I was trying to add/scaffold the controller, I was able to see all the components in the wizard, but in creation after naming it, the error was thrown.

answered Nov 30, 2022 at 15:11

Я испробовал все решения, такие как ремонт VS 2013, но бесполезно. Когда вы создаете контроллер, щелкая правой кнопкой мыши на папке Controller и добавляете контроллер, затем вы щелкаете правой кнопкой мыши в Action недавно созданного контроллера и выбираете Add View, это происходит именно тогда, когда я пытаюсь создать представление. Это не новый проект, это существующий проект.

24 авг. 2016, в 17:24

Поделиться

Источник

У меня такая же ошибка, я просто удалил только разрешение на чтение в папке, где находится веб-проект

У меня была эта проблема на моем VS2017, и я решил ее, выполнив это:
Перейдите в C:UsersusernameAppDataLocalMicrosoftVisualStudio15.0_7fca0c70 и вы увидите папку с именем ComponentModelCache только что переименованную в _ComponentModelCache или что-то еще, Visual Studio снова создаст эту папку.
Под именем папки VisualStudio 15.0_7fca0c70 можно заметить, что это зависит от версии VS. Теперь вы готовы идти. Надеюсь, это кому-нибудь поможет.

Устранил ошибку, запустив целый новый проект, потому что я изначально ссылался на библиотеку классов, в которой размещался код доступа к данным и бизнес-логики для моего проекта.

У меня такая же ошибка в vs2017 на windows10, пожалуйста, попробуйте запустить vs от имени администратора, надеюсь, это будет работать и для вас.

Перезапустите Visual Studio и попробуйте снова.

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