Question

I have to create some sort of text file in which there are numbers and Hebrew letters decoded to ASCII.

This is file creation method which triggers on ButtonClick

protected void ToFile(object sender, EventArgs e)
{
    filename = Transactions.generateDateYMDHMS();
    string path = string.Format("{0}{1}.001", Server.MapPath("~/transactions/"), filename);
    StreamWriter sw = new StreamWriter(path, false, Encoding.ASCII);
    sw.WriteLine("hello");
    sw.WriteLine(Transactions.convertUTF8ASCII("שלום"));
    sw.WriteLine("bye");
    sw.Close();
}

as you can see, i use Transactions.convertUTF8ASCII() static method to convert from probably Unicode string from .NET to ASCII representation of it. I use it on term Hebrew ‘shalom’ and get back ‘????’ instead of result i need.

Here is the method.

public static string convertUTF8ASCII(string initialString)
{
    byte[] unicodeBytes = Encoding.Unicode.GetBytes(initialString);
    byte[] asciiBytes = Encoding.Convert(Encoding.Unicode, Encoding.ASCII, unicodeBytes);
    return Encoding.ASCII.GetString(asciiBytes);
}

Instead of having initial word decoded to ASCII i get ‘????’ in the file i create even if i run debbuger i get same result.

What i’m doing wrong ?

Answer 1

You can’t simply translate arbitrary unicode characters to ASCII. The best it can do is discard the unsupportable characters, hence ????. Obviously the basic 7-bit characters will work, but not much else. I’m curious as to what the expected result is?

If you need this for transfer (rather than representation) you might consider base-64 encoding of the underlying UTF8 bytes.