As part of my work on an ASP.NET Core 3.1 Razor Pages web application, I created several custom Tag Helpers. Once I had all of these working the way I wanted and expected (as part of the ASP.NET Core 3.1 application), I moved the Tag Helpers to a Razor Class Library (.NET Standard 2.1), so I could use the custom Tag Helpers in other applications.
That is where I ran into a problem with a Tag Helper to render a Partial Page using the PartialTagHelper class:
TypeLoadException: Could not load type 'Microsoft.AspNetCore.Mvc.ViewFeatures.Internal.IViewBufferScope' from assembly 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=18.104.22.168, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
The constructor for the PartialTagHelper class requires the IViewBufferScope parameter noted in this error and is passed into the custom Tag Helper code via Dependency Injection.
In the ASP.NET Core 3.1 Razor Page, the custom Tag Helper code requires a 'using' reference to the Microsoft.AspNetCore.Mvc.ViewFeatures.Buffers namespace.
In the .NET Standard Class Library, the custom Tag Helper code requires a 'using' reference to the Microsoft.AspNetCore.Mvc.ViewFeatures.Internal namespace.
So, the error sounds like ASP.NET Core 3.1 Razor Page is injecting the 3.1.3 Microsoft.AspNetCore.Mvc.ViewFeatures assembly and this does not contain the IViewBufferScope parameter from the correct assembly.
Is there a way to resolve this?