CODEWITHSUNDEEP
c#stringencodingcharacter-encodingiso-8859-1
netblognet
netblognet

Reputation: 2026

Check if string consists only of valid ISO 8859-1 characters

How to check if a string consists only of chars, which can be successfully encoded in ISO 8859-1? Or in other words - how to find "illegal"/"not ISO 8859-1 compatible" chars in a string?

Upvotes: 4

Views: 11102

Answers (3)

ProgramFOX
ProgramFOX

Reputation: 6400

Try this:

    private static bool IsValidISO(string input)
    {
        byte[] bytes = Encoding.GetEncoding("ISO-8859-1").GetBytes(input);
        String result = Encoding.GetEncoding("ISO-8859-1").GetString(bytes);
        return String.Equals(input, result);
    }

This answer is based on an answer of this Java question (my code is the C# equivalent): http://www.velocityreviews.com/forums/t137810-checking-whether-a-string-contains-only-iso-8859-1-chars.html

Upvotes: 15

netblognet
netblognet

Reputation: 2026

I came up with this idea. Might this be possible? 

    private static bool IsValidISO(string input)
    {
        foreach (char c in input)
        {
            Encoding iso = Encoding.GetEncoding("ISO-8859-1");
            Encoding utf8 = Encoding.UTF8;

            byte[] isoBytes = iso.GetBytes(c.ToString());
            byte[] utfBytes = Encoding.Convert(iso, utf8, isoBytes);

            string convertedC = utf8.GetString(utfBytes);
            if (c != '?' && convertedC == "?")
                return false;
        }
        return true;
    }

Upvotes: 0

Ron Deijkers
Ron Deijkers

Reputation: 3101

You could setup an array or list of valid characters and then iterate through your string to check if each of them exists in your list of valid characters. The list can be created by adding all valid latin-1 characters to it.

Upvotes: 0

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