Is there a way to get a Razor Class Library Tag Helper for Partial Pages to work in an ASP.NET Core 3.1 Razor Pages application

Dean Henderson 1 Reputation point
2020-05-16T05:37:49.84+00:00

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=3.1.3.0, 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?

Thanks

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  1. Leon Laude 85,646 Reputation points
    2020-05-16T07:27:39.753+00:00

    Hi,

    Q&A currently supports the products listed over here https://learn.microsoft.com/en-us/answers/products (more to be added later on).

    You can reach the experts in the dedicated ASP.NET Core forum over here:
    https://forums.asp.net/1255.aspx/1?ASP+NET+Core

    (Please don't forget to mark helpful replies as answer)

    Best regards,
    Leon

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