.NET RETOUR RÉSULTAGE Encodage comme UTF8

private async Task<string> ResponseMessageAsync(HttpResponseMessage result)
{
    string message = await result.Content.ReadAsStringAsync();
    string parsedString = Regex.Unescape(message);
    byte[] isoBites = Encoding.GetEncoding("ISO-8859-1").GetBytes(parsedString);
    return Encoding.UTF8.GetString(isoBites, 0, isoBites.Length);
 }
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