aspnet-codegenerator error: "path is empty"

Question

I'm attempting to scaffold the Identity pages for a new .NET 6.0 project (created from the ASP.NET Core MVC template). When I run the following command I get the error "path is empty" (I also included the build command output to show the project builds successfully).

> dotnet build

Microsoft (R) Build Engine version 17.0.0+c9eb9dd64 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  All projects are up-to-date for restore.
  ExampleProject -> C:\...\bin\Debug\net6.0\ExampleProject.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.52


> dotnet aspnet-codegenerator identity -lf

[Trace]: Command Line: identity -lf
Building project ...
[Trace]: Command Line: --no-dispatch --port-number 64193 identity -lf --dispatcher-version 6.0.0+cc9d1f5236d926269a0471042f72bf83b498509c
Scaffolding failed.
The path is empty. (Parameter 'path')
[Trace]:    at System.IO.Path.GetFullPath(String path)
   at System.IO.Enumeration.FileSystemEnumerator`1..ctor(String directory, Boolean isNormalized, EnumerationOptions options)
   at System.IO.Enumeration.FileSystemEnumerable`1..ctor(String directory, FindTransform transform, EnumerationOptions options, Boolean isNormalized)
   at System.IO.Enumeration.FileSystemEnumerableFactory.UserFiles(String directory, String expression, EnumerationOptions options)
   at System.IO.Directory.InternalEnumeratePaths(String path, String searchPattern, SearchTarget searchTarget, EnumerationOptions options)
   at Microsoft.VisualStudio.Web.CodeGeneration.Msbuild.ProjectContextWriter.GetScaffoldingAssemblies(IEnumerable`1 dependencies)
   at Microsoft.DotNet.Scaffolding.Shared.ProjectModel.ProjectContextExtensions.AddPackageDependencies(IProjectContext projectInformation, String projectAssetsFile)
   at Microsoft.VisualStudio.Web.CodeGeneration.Design.Program.<>c__DisplayClass4_0.<<Execute>b__0>d.MoveNext()
RunTime 00:00:02.43

This error, "The path is empty," also appears (without the stack trace) when attempting to scaffold a new Razor view (e.g. Create) via the Add -> View context menu in Visual Studio 2022.

Is this a configuration issue, or a bug in the code generator?

Edit (2021-11-29): After reproducing this error from scratch, it appears it occurs after adding the Microsoft.AspNetCore.Identity Nuget package to the project, as shown below.

Reproduction Steps:

Create a new project in Visual Studio 2022 using the template "ASP.NET Core Web App (Model-View-Controller)" targeting .NET 6.0 and with the authentication type set to Individual Accounts.
Add the following Nuget package:
- Microsoft.VisualStudio.Web.CodeGeneration.Design (to support scaffolding)
Save all files (Ctrl + Shift + S) and rebuild the solution.
At this point, open cmd to the project file's directory and run "dotnet aspnet-codegenerator identity -lf" to ensure the list of available Identity views for scaffolding is shown successfully.
Add the following Nuget package:
- Microsoft.AspNetCore.Identity
Save all files (Ctrl + Shift + S) and rebuild the solution.

Try to re-run the command "dotnet aspnet-codegenerator identity -lf" and the following error should occur:

 [Trace]: Command Line: identity -lf
 Building project ...
 [Trace]: Command Line: --no-dispatch --port-number 57313 identity -lf --dispatcher-version 6.0.0+cc9d1f5236d926269a0471042f72bf83b498509c
 Scaffolding failed.
 The path is empty. (Parameter 'path')
 [Trace]:    at System.IO.Path.GetFullPath(String path)
    at System.IO.Enumeration.FileSystemEnumerator`1..ctor(String directory, Boolean isNormalized, EnumerationOptions options)
    at System.IO.Enumeration.FileSystemEnumerable`1..ctor(String directory, FindTransform transform, EnumerationOptions options, Boolean isNormalized)
    at System.IO.Enumeration.FileSystemEnumerableFactory.UserFiles(String directory, String expression, EnumerationOptions options)
    at System.IO.Directory.InternalEnumeratePaths(String path, String searchPattern, SearchTarget searchTarget, EnumerationOptions options)
    at Microsoft.VisualStudio.Web.CodeGeneration.Msbuild.ProjectContextWriter.GetScaffoldingAssemblies(IEnumerable`1 dependencies)
    at Microsoft.DotNet.Scaffolding.Shared.ProjectModel.ProjectContextExtensions.AddPackageDependencies(IProjectContext projectInformation, String projectAssetsFile)
    at Microsoft.VisualStudio.Web.CodeGeneration.Design.Program.<>c__DisplayClass4_0.<<Execute>b__0>d.MoveNext()
 RunTime 00:00:03.53

Could you pls show us which tutorial you followed and then met this issue sir? I think it may help to reproduce the issue. — Tiny Wang
– Tiny Wang, Commented Nov 26, 2021 at 7:26
No tutorial, just the "ASP.NET Core Web App (Model-View-Controller) template with "Individual Accounts" selected as the authentication type. I'll record reproduction steps and add it to the question. — Extragorey
– Extragorey, Commented Nov 28, 2021 at 23:40
I also got the same issue after adding "Microsoft.AspNetCore.Identity" — Sameera K
– Sameera K, Commented Dec 6, 2021 at 1:17
Still no solution besides removing the reference to Microsoft.AspNetCore.Identity. — Extragorey
– Extragorey, Commented Jan 11, 2022 at 23:53

misanthrop · Accepted Answer · 2022-01-20 15:49:57Z

5

As mentioned by the comment on the question and on this site

https://github.com/dotnet/Scaffolding/issues/1713

Removing the nuget package Microsoft.AspNetCore.Identity from all projects in the relevant solution solves the problem.

In many cases (also in mine) its enough to reference the nuget package Microsoft.AspNetCore.Identity.EntityFrameworkCore

answered Jan 20, 2022 at 15:49

misanthrop

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