String.Substrin g result when non-alphanumeric character?

[Bill]

I just ran into a situation where string data from a mainframe contained a
couple of non-alphanumeric characters (hex CC and C8). I was parsing a field
that occurred after these unexpected characters and it appears the Substring
method was thrown off and returned a field two bytes off.

Does this data cause a problem with the Substring method?

[Jon Skeet [C# MVP]]

Bill <nf*@nospam.com > wrote:

I just ran into a situation where string data from a mainframe contained a
couple of non-alphanumeric characters (hex CC and C8). I was parsing a field
that occurred after these unexpected characters and it appears the Substring
method was thrown off and returned a field two bytes off.

Does this data cause a problem with the Substring method?

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Jon Skeet [C# MVP]]

Bill <nf*@nospam.com > wrote:

This test now appears to be an issue with the StreamReader dropping these
unexpected characters.

Ah - and that's almost certainly just because you haven't given it the
right encoding. You haven't specified an encoding, so it's using UTF-8,
which I don't believe is what you really wanted.

See http://www.pobox.com/~skeet/csharp/unicode.html for more
information about encodings and Unicode.

You probably want to use Encoding.Defaul t in this case.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Bill]

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

Bill <nf*@nospam.com > wrote:

This test now appears to be an issue with the StreamReader dropping these unexpected characters.

Ah - and that's almost certainly just because you haven't given it the
right encoding. You haven't specified an encoding, so it's using UTF-8,
which I don't believe is what you really wanted.

See http://www.pobox.com/~skeet/csharp/unicode.html for more
information about encodings and Unicode.

You probably want to use Encoding.Defaul t in this case.

Yes... Encoding.Defaul t solved the problem.

The following modifications to my original test example works:

class Class1
{
static void Main(string[] args)
{
string str;

using (StreamWriter sro = new StreamWriter("P robDataOut.txt" ))
{
using (StreamReader sri = new StreamReader("P robDataIn.txt",
Encoding.Defaul t))
{
Console.WriteLi ne("---- TESTING FILE WITH PROBLEM CHARACTERS
HEX 'CC' and 'C8' ----");
while ( (str = sri.ReadLine()) != null )
{
Console.WriteLi ne("Length: " + str.Length);
Console.WriteLi ne("Output: " + str.Substring(1 84,1));
sro.WriteLine(s tr);
}
}
}
}
}