How to Correctly Convert UTF-8 to ISO-8859-1 in C#?

Solving the UTF-8 to ISO-8859-1 conversion problem in C#

When converting UTF-8 strings to ISO-8859-1, you may encounter result errors if not handled correctly. Let's analyze the problem and provide a solution.

Code and questions

The code snippet you provided attempts to convert UTF-8 to ISO-8859-1 using Encoding.GetString and Encoding.GetBytes. However, for this particular conversion, additional steps are required.

Solution: Use Encoding.Convert

To properly adjust the byte array before decoding to the target encoding, Encoding.Convert should be used. The following is the modified code:

Encoding iso = Encoding.GetEncoding("ISO-8859-1");
Encoding utf8 = Encoding.UTF8;
byte[] utfBytes = utf8.GetBytes(Message);
byte[] isoBytes = Encoding.Convert(utf8, iso, utfBytes);
string msg = iso.GetString(isoBytes);

Explanation

Encoding.GetEncodingRetrieves the encoder and decoder for a specific character encoding. Encoding.GetBytesEncode UTF-8 source string into byte array. However, decoding this byte array directly using Encoding.GetString does not produce the desired ISO-8859-1 string.

Encoding.ConvertAdjust the byte array to match the target encoding. In this case it converts the bytes to match the ISO-8859-1 encoding. The adjusted byte array can then be decoded into a correct ISO-8859-1 string. Encoding.GetString

Results

After applying this modification, your resulting string will be correctly converted to ISO-8859-1 and will not be garbled.

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