How to convert IDN to ASCII?

Question

What is the best way to convert an internationalized domain name to its ASCII-form?

I want to convert Bücher.ch into xn--bcher-kva.ch by using some sort of (free) .net code.

Cormick

Answer 1

Have a look at the GNU IDN Library - Libidn. The introduction says that C# libraries are available.

Drenthe

-1 for suggesting a 3rd party library when .NET itself is capable of this. – Gillman

@Gillman The .NET library does not support all chars. link for example: ß is not supported. – Fregoso

Answer 2

using System.Globalization;
...
IdnMapping idn = new IdnMapping();
MessageBox.Show(idn.GetAscii("www.kraków.pl"));

Squeak

Answer 3

To Get the other way around from xn--bcher-kva.ch domain to Bücher.ch

using System.Globalization;
...
IdnMapping idn = new IdnMapping();
MessageBox.Show(idn.GetUnicode("xn--bcher-kva.ch"));

You will get www.kraków.pl as result. Because i came here to look for this :) hope it is helpful for others as well :)

MSDN

Bounder