KeyNotFoundException System.ComponentModel.Annotation

[bswift-kj]

Describe the bug

We are trying to upgrade some class libraries, currently built in .NET Framework 4.7.2, and will occasionally get a KeyNotFound Exception that references System.ComponentModel.Annotations. However this reference is not located in this project. We are not sure why this is happening. We have spoken with Microsoft and they recommended that I ask here. I am happy to provide the .csproj file and .clef files if requested, but does not look like I can upload it here.

To Reproduce

Can supply project files if requested.

Exceptions (if any)

Further technical details

• Windows 64 bit
  

Thank you for your help.

[sunandabalu]

@bswift-kj Could you please provide the .csproj file you are using and also the .clef file for logs? If you are unable to upload here, feel free to email to [email protected]

[bswift-kj]

I am unable to upload or email that emails address (RESOLVER.RST.SenderNotAuthenticatedForGroup; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group).

[zdzdz]

I'm experiencing absolutely the same issue.
I follow the guide from the documentation https://docs.microsoft.com/en-us/dotnet/core/porting/upgrade-assistant-aspnetmvc with absolutely freshly created MVC project (.net 4.5.2). I run the upgrade-assistant and second step that converts the project file fails with 'Unexpected error applying step
System.Collections.Generic.KeyNotFoundException: The given key 'System.ComponentModel.Annotations' was not present in the dictionary.'

I even excluded 'System.ComponentModel.DataAnnotations' and still same result.

[Natis88]

any solution for this problem?

[sgalcheung]

Recently, I also meet the same issue, and found a relation issue

[sgalcheung]

• Can not found dll，Could not load file or assembly 'System.ComponentModel.Annotations, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified
  • Use the dotnet-convert command to modify csproj to a new version of the template
  • After starting the host project, I found that the above exception was thrown
  • After analysis, it is found that it is called System. ComponentModel.DataAnnotations in netframework, and System. ComponentModel.Annotations in netstandard/netcore
  • At this time, use the multi-target version to solve this problem
  • First you need to add the corresponding target version, and then refer to different packages for different frameworks, as follows

<ItemGroup Condition="'$(TargetFramework)'=='net472' Or '$(TargetFramework)'=='net461'">
  <Reference Include="System.ComponentModel.DataAnnotations" />
</ItemGroup>

<ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
  <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
</ItemGroup>

This solved my issue