Remove accent

When 'slugifying' a string (and when 'canonicalizing' a username) i like to remove accents, and this was sufficient in classic .net:

//using System.Text

public static string RemoveAccent(this string txt)
{
    byte[] bytes = Encoding.GetEncoding("Cyrillic").GetBytes(txt);
    return Encoding.ASCII.GetString(bytes);
}

But in .net core it crashed with:

'Cyrillic' is not a supported encoding name.

The magic incantation was to add:

Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

To wit:

//using System.Text

public static string RemoveAccent(this string txt)
{
    Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

    byte[] bytes = Encoding.GetEncoding("Cyrillic").GetBytes(txt);
    return Encoding.ASCII.GetString(bytes);
}

And thus we end up with our slugify extension method working again:

public static string ToSlug(this string self, int maxLength = 45)
{
    string str = self.RemoveAccent().ToLower();
    // remove invalid chars
    str = Regex.Replace(str, @"[^a-z0-9\s-]", "");
    // multiple spaces into one space
    str = Regex.Replace(str, @"\s+", " ").Trim();
    // max length
    str = str.Substring(0, Math.Min(maxLength, str.Length));
    // space to hyphens
    str = str.Replace(" ", "-");
    return str;
}