How to use the "CodePagesEncodingProvider" Class at .NET core 2.1?

I want to use the code page (e.g. code page 936) which is not supported in UWP apps. I can get the code page 936 by use the "CodePagesEncodingProvider" class at .NET core 2.0, but it seems that there is not available at .NET core 2.1, how to fix this?
Best regards.

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* ID: a5c26a9c-9378-f153-0e10-2d893d8ea178
* Version Independent ID: 5a122d68-cd0b-abe8-fd6c-258d44c816a2
* Content: [CodePagesEncodingProvider Class (System.Text)](https://docs.microsoft.com/en-us/dotnet/api/system.text.codepagesencodingprovider?view=netcore-2.0&viewFallbackFrom=netcore-2.1)
* Content Source: [xml/System.Text/CodePagesEncodingProvider.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Text/CodePagesEncodingProvider.xml)
* Product: **dotnet-api**
* GitHub Login: @rpetrusha
* Microsoft Alias: **ronpet**