"Microsoft.AspNetCore.Mvc.ViewFeatures.Internal" can not find in dotnet core 3.0.0-preview7-27912-14

[Benknightdark]

After I upgrade my dotnet core 2.2 MVC application to 3.0.0-preview7-27912-14, my custom razor html extesion can not find "Microsoft.AspNetCore.Mvc.ViewFeatures.Internal".

And, after "Microsoft.AspNetCore.Mvc.ViewFeatures.Internal" can not find , here is some function I can not use , such as ExpressionHelper and ExpressionMetadataProvider.

Here is my example github url : https://github.com/Benknightdark/dotnetcore3v7

[carlossanlop]

@Pilchie is this something you can help with?

[omajid]

Sounds like dotnet/aspnetcore#4932

In ASP.NET Core, pubinternal types are types that are declared as public but put in an .Internal namespace. While these types are public they have no support policy and are subject to breaking changes. Unfortunately accidental use of these types has been common, resulting in breaking changes to these projects and limiting our ability to maintain the framework.

In ASP.NET Core 3.0, we are updating all pubinternal types in MVC to either be public in a supported namespace, or internal as appropriate. This includes types in the following namespaces:

Microsoft.AspNetCore.Mvc.ViewFeatures.Internal

[Pilchie]

@rynowak

[rynowak]

We answered the same question here: dotnet/aspnetcore#12643 (comment)

[Pilchie]

Closing, as this is answered.