How can I access the ANSI encoding in MSTest unit test for .NET Core, which currently offers only seven encodings?

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If the seven encodings provided by .NET Core for MSTest unit tests do not include the ANSI encoding you need, you can try using the following workaround:

1. Define a constant representing the code page number for the ANSI encoding you need. For example, for Windows-1252 encoding, the code page number is 1252.

2. Use the Encoding.RegisterProvider method to add a custom encoding provider that supports the missing encoding. Below is an example of how to add support for Windows-1252 encoding:

const int WINDOWS_1252_CODE_PAGE = 1252;
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
var encoding = Encoding.GetEncoding(WINDOWS_1252_CODE_PAGE);

1. Use the newly created encoding object to encode or decode your data:

// Encode a string to bytes
var bytes = encoding.GetBytes("Hello, world!");

// Decode bytes to a string
var str = encoding.GetString(bytes);

Note that this workaround may not be portable across different platforms or environments. Also, keep in mind that ANSI encoding may not be suitable for all use cases, as it does not support all characters and may result in data loss or corruption.