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ASP.NET Core 2.1 Error - 'Cyrillic' is not a supported encoding name

1,392 views 0 comments about 2 years ago Raymond Tang

After upgrading to ASP.NET Core 2.1 (.NET Core SDK 2.1.301), you may encounter the following error about encoding:

System.ArgumentException
   HResult=0x80070057
   Message='Cyrillic' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.
   Source=System.Private.CoreLib
   StackTrace:
    at System.Text.EncodingTable.internalGetCodePageFromName(String name)
    at System.Text.EncodingTable.GetCodePageFromName(String name)
    at System.Text.Encoding.GetEncoding(String name)

The error message itself already provides the solution.

To resolve the issue, add package reference System.Text.Encoding.CodePages.

And then register code page encoding provider via Encoding.RegisterProvider method.

public void ConfigureServices(IServiceCollection services)
{

// …

// Register code
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

}

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