EEFileLoadException when executing Services.AddMvc after upgrading from NET5.0 to NET6.0

[claudiolsmonteiro]

Describe the bug

After the release of NET6.0, my team decided it was a good idea to upgrade our API and Portal to NET6.0.
We changed every project's TargetFramework to 'net6.0' and upgraded every Nuget to their latest version. We have also changed a couple of methods related to now obsolete references (i.e WebClient -> HttpClient).
Our API started working right away but our Portal started throwing the exceptions written below.
We thought it could be a problem related to the old Hosting Model, but even after changing to the new one the exceptions are the same.

Piece of Code being executed:

builder.Services.AddMvc(option => option.EnableEndpointRouting = false)
              .AddControllersAsServices()
              .AddTagHelpersAsServices()
              .AddViewComponentsAsServices()
              .AddNewtonsoftJson(options =>
              {
                  options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
                  options.SerializerSettings.ContractResolver = new DefaultContractResolver();
              });

Exceptions

Exception thrown at 0x00007FFB89384F99 in iisexpress.exe: Microsoft C++ exception: EEFileLoadException at memory location 0x00000068F7D7D310.

Exception thrown at 0x00007FFB89384F99 in iisexpress.exe: Microsoft C++ exception: [rethrow] at memory location 0x0000000000000000.

Exception thrown at 0x00007FFB89384F99 in iisexpress.exe: Microsoft C++ exception: EEFileLoadException at memory location 0x00000068F7D7D310.

Exception thrown at 0x00007FFB89384F99 in iisexpress.exe: Microsoft C++ exception: [rethrow] at memory location 0x0000000000000000.

Exception thrown at 0x00007FFB89384F99 in iisexpress.exe: Microsoft C++ exception: EEFileLoadException at memory location 0x00000068F7D7D310.




System.IO.FileNotFoundException: 'Could not load file or assembly 'xxxxx.Client.Portal.Views, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.'

Further technical details

• ASP.NET Core version: NET6.0
• The IDE (VS / VS Code/ VS4Mac) you're running on, and its version: Visual Studio 2022 Version 17.0.1

dotnet --info Output

dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.100
 Commit:    9e8b04bbff

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19042
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\6.0.100\

Host (useful for support):
  Version: 6.0.0
  Commit:  4822e3c3aa

.NET SDKs installed:
  2.1.519 [C:\Program Files\dotnet\sdk]
  5.0.202 [C:\Program Files\dotnet\sdk]
  5.0.401 [C:\Program Files\dotnet\sdk]
  6.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.19 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.19 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[javiercn]

@claudiolsmonteiro thanks for contacting us.

Does the issue reproduce if you remove the bin and obj folders manually from your app and perform a clean build?

Hi @claudiolsmonteiro. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[claudiolsmonteiro]

@claudiolsmonteiro thanks for contacting us.

Does the issue reproduce if you remove the bin and obj folders manually from your app and perform a clean build?

Thank your for reply. I have just tried and the exceptions are still the same.

[javiercn]

@claudiolsmonteiro can you provide the entire callstack in text?

I suspect the exception comes from builder.Services.AddMvc(option => option.EnableEndpointRouting = false);
If you remove the other method invocations, does it continue to fail?

Hi @claudiolsmonteiro. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[claudiolsmonteiro]

I suspect the exception comes from builder.Services.AddMvc(option => option.EnableEndpointRouting = false); If you remove the other method invocations, does it continue to fail?

It continues to fail even if I only use the first line. I have also tried using AddControllersWithViews or AddRazorPages and the exceptions are still the same.

can you provide the entire callstack in text?