WP8.1 does not coding windows-1251

[esther]

It is necessary to translate the text in the windows 1251 coding into the line. To this end, I use a built-in tool:

Encoding encoding = Encoding.GetEncoding("windows-1251");

However, this code makes an exception:

'windows-1251' is not a supported encoding name.
Parameter name: name

I can't figure out what's wrong here, on the Internet, and even on an English-speaking stackoverflow, that's the way it is to code and decide.

[guilherme]

Apparently, System.Text.Encoding supports only three codings:

System.Text.Encoding.BigEndianUnicode
System.Text.Encoding.Unicode
System.Text.Encoding.UTF8

Accordingly, it cannot find windows-1251. For he doesn't know that code.

To use the windows 1251, you need to use your class from System.Text.Encoding and describe the code.

About:

public class Windows1251 : Encoding 
{
    static string alpha = "\0\a\b\t\n\v\f\r !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ЂЃ‚ѓ„…†‡€‰Љ‹ЊЌЋЏђ‘’“”•–—™љ›њќћџ ЎўЈ¤Ґ¦§Ё©Є«¬­®Ї°±Ііґµ¶·ё№є»јЅѕїАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя";
    public override int GetByteCount(char[] chars, int index, int count)
    {
        return count;
    }
public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
{
    byte questionIndex = (byte)alpha.IndexOf('?');
    for (int i = 0; i &lt; charCount; i++)
    {
        int toIndex = byteIndex + i;
        int index = alpha.IndexOf(chars[charIndex + i]);
        if (index == -1)
            bytes[toIndex] = questionIndex;
        else
            bytes[toIndex] = (byte)index;
    }
    return charCount;
}

public override int GetCharCount(byte[] bytes, int index, int count)
{
    return count;
}

public override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
{
    for (int i = 0; i &lt; byteCount; i++)
    {
        chars[i + charIndex] = alpha[bytes[byteIndex + i]];
    }
    return byteCount;
}

public override int GetMaxByteCount(int charCount)
{
    return charCount;
}

public override int GetMaxCharCount(int byteCount)
{
    return byteCount;
} 

}