character set encoding: how to generate errors

[Oliver]

Hi -

I am using the Encoding class to encode unicode strings.

I am encoding into a variety of target encodings eg utf-8,
'iso-8859-1' or 'iso-8859-5' etc

like this:
encodedBytes = Encoding.GetEncoding("iso-8859-1").GetBytes(TextBox1.Text);

anyone know a technique to cause exceptions to be thrown if there is
no corresponding mapping possible for any of the characters?

what is happening in practice is that they get converted into a '?'
symbol - but I'd rather an exception were thrown....

ta,
Oliver.

[Jon Skeet [C# MVP]]

Oliver <sp*************@yahoo.com> wrote:

I am using the Encoding class to encode unicode strings.

I am encoding into a variety of target encodings eg utf-8,
'iso-8859-1' or 'iso-8859-5' etc

like this:
encodedBytes = Encoding.GetEncoding("iso-8859-1").GetBytes(TextBox1.Text);

anyone know a technique to cause exceptions to be thrown if there is
no corresponding mapping possible for any of the characters?

what is happening in practice is that they get converted into a '?'
symbol - but I'd rather an exception were thrown....

The usual way of doing that is by reversing the process, and seeing
whether or not you end up with the same string:

byte[] EncodeTextOrThrow (Encoding encoding, string text)
{
byte[] ret = encoding.GetBytes(text);
string cycled = encoding.GetString(ret);
if (cycled != text)
{
throw new ApplicationException ("Could not encode text");
}
return ret;
}

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Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
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