Error at Add-Migration CreateIdentitySchema

Dean Everhart 1,536

Error:

...The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

Tutorial

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/scaffold-identity?view=aspnetcore-6.0&tabs=visual-studio#scaffold-identity-into-a-razor-project-with-authorization

Directions from tutorial

Migrations

The generated Identity database code requires Entity Framework Core Migrations. Create a migration and update the database. For example, run the following commands:

Install-Package Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore 
Add-Migration CreateIdentitySchema 
Update-Database

Step

Add-Migration CreateIdentitySchema

Subject of error on build

Authentication.Areas.Identity.Pages._ViewImports.cshtml

@using Microsoft.AspNetCore.Identity
@using Authentication.
@using Authentication.
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

Error on build

Build started...

1>------ Build started: Project: Authentication, Configuration: Debug Any CPU ------

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(2,22,2,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(3,22,3,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages\Account_ViewImports.cshtml(1,22,1,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages\Account\Manage_ViewImports.cshtml(1,22,1,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(2,22,2,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(3,22,3,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages\Account_ViewImports.cshtml(1,22,1,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages\Account\Manage_ViewImports.cshtml(1,22,1,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(2,22,2,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(3,22,3,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages\Account_ViewImports.cshtml(1,22,1,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(2,22,2,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(3,22,3,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(2,22,2,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(3,22,3,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(2,22,2,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>C:\Users\User1\Desktop\Tech\Authentication\Authentication\Authentication - Copy\Authentication\Areas\Identity\Pages_ViewImports.cshtml(3,22,3,27): error CS0234: The type or namespace name 'Areas' does not exist in the namespace 'Authentication' (are you missing an assembly reference?)

1>Done building project "Authentication.csproj" -- FAILED.

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

========== Elapsed 00:00.696 ==========

AgaveJoe 27,696 Reputation points

2023-02-03T17:35:56.25+00:00

Can you clarify the goal? The link you provided does NOT execute a migration. It assumes you already have Identity configured.

Dean Everhart 1,536

I'm up to the third step (below).

The generated Identity database code requires Entity Framework Core Migrations. Create a migration and update the database. For example, run the following commands:

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/scaffold-identity?view=aspnetcore-6.0&tabs=visual-studio#scaffold-identity-into-a-razor-project-with-authorization




1.
 
pm> NuGet\Install-Package Microsoft.VisualStudio.Web.CodeGeneration.Design -Version 6.0.11

2.

Scaffold Identity

      project level ("Authentication")
      add / new scaffolding item
      Identity [left pane] / Add [btn]

      _layout.cshtml - add  at ~/Views/Shared/_Layout.cshtml

     point to existing context class.

     Note: To use your existing data context, select at least one file to override. You  must select at least one file to add your data context.
     Note: If you're creating a new user context, you don't have to select a file to override.


3.

Install-Package Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore -Version 6.0.11

Add-Migration CreateIdentitySchema                <- Error at this step

Update-Database

User's image

AgaveJoe 27,696 Reputation points

2023-02-04T17:33:39.26+00:00

I've scaffolded Identity many time and cannot reproduce this error.

Is there anyway you can explain the steps you are performing. I'm asking because the link you provided has two steps not three.

Scaffold Identity into a Razor project with authorization

The third step come into play when the Identity database does not exist.

However, you should be able to create a migration. I think there is something else going on.
Dean Everhart 1,536 Reputation points

2023-02-04T19:03:22.0633333+00:00

Ah...sorry... the first step is at this link:

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/identity?view=aspnetcore-6.0&tabs=visual-studio

...which has a link to the scaffolding directions:

Scaffold Register, Login, LogOut, and RegisterConfirmation

Add the Register, Login, LogOut, and RegisterConfirmation files. Follow the Scaffold identity into a Razor project with authorization instructions to generate the code shown in this section.

original scaffolding link:

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/scaffold-identity?view=aspnetcore-6.0&tabs=visual-studio#scaffold-identity-into-a-razor-project-with-authorization

I'm working in .net core 6 MVC, if that makes a difference.
AgaveJoe 27,696 Reputation points

2023-02-04T19:17:22.91+00:00
I'm confused, the first link creates a new project using the "Individual Account" template which already has a migration file. The step "Update-Database" invokes the migration and creates the Identity database as explained in the tutorial. Next, the tutorial illustrates how to scaffold Register, Login, LogOut, and RegisterConfirmation pages so you can view/modify the markup in the project. The scaffolding steps are in the second link.

I think what happened is you went too far in the second link are tried to create the database which you already created in the first link. The only steps in the second link are install a NuGet package...

Install-Package Microsoft.VisualStudio.Web.CodeGeneration.Design

...and scaffold the pages. After scaffolding you should go back to the first link and modify the newly created pages.

If it is of any help, I followed the first link and it just works. Perhaps try the exercise again. This time only scaffold the Razor pages then go back to the first link. Do not create a migration.
Dean Everhart 1,536 Reputation points

2023-02-04T20:31:06.2533333+00:00

Thanks!