Concatenating string with exception message

Question

I am trying to catch an exception when my XSD is invalid and just display a message on the console detailing to the user what went wrong. However the message that is displayed on the console is not as I expected.

try
{
    // doing stuff here
}
catch (XmlException e)
{
    Console.WriteLine("ERROR: Schema " + e.Message);
    return false;
}

I expected the output to be something like:

"ERROR: Schema ' is an unexpected token. The expected token is '>'. Line 15, position 38."

However the output that I get is:

"' is an unexpected token. The expected token is '>'. Line 15, position 38."

My string at the beginning is not displayed before the message.

I have tried storing the values in two strings and tried concatenating those 2 string with no success. Ideally I would like one string that contains the concatenation of both the 'ERROR' part and the message produced by the exception.

If you debug, does it hit that breakpoint? It could be possible that you're catching the wrong exception — Dan Drews, Aug 06 '14 at 16:37
Why is there only one single quote at the start of the message? I think that's a big clue. I would expect single quotes around the unexpected token. — brianestey, Aug 06 '14 at 16:38
I have changed it to Catch(Exception e) and the same behavior results — Dan Smith, Aug 06 '14 at 16:46

Yogesh · Accepted Answer · 2014-08-06T16:47:47.850

2

I think your schema contains a newline. The text ERROR: Schema ' must be somewhere higher in the output window.

You can check this using:

catch (XmlException e)
{
    string message = "ERROR: Schema " + e.Message;
    message = message.Replace(Environment.NewLine, "");
    message = message.Replace("\n", "");
    message = message.Replace("\r", "");

    Console.WriteLine(message);
    return false;
}

edited Aug 06 '14 at 16:47

answered Aug 06 '14 at 16:41

Yogesh

14,498
6
44
69

This produces the same result: ' is an unexpected token. The expected token is '>'. Line 15, position 38. – Dan Smith Aug 06 '14 at 16:46
That did the trick! So I guess there was some whitespace character? I don't understand why I didn't see both parts of the output anywhere on the console though? – Dan Smith Aug 06 '14 at 16:49
1

If you can't see `ERROR: Schema '` higher up somewhere, that means your schema contained a carriage return (`\r`). – Yogesh Aug 06 '14 at 16:52
Good thinking Yogesh, without the actual console output at hand. +1. – Emile Aug 06 '14 at 19:39

score 0 · Answer 2 · answered Aug 06 '14 at 16:45

0

Try with:

try
{
    // doing stuff here
}
catch (XmlException e)
{
    errorMessage = "ERROR: Schema " + e.Message.toString();

    Console.WriteLine(errorMessage );
    return false;
}

answered Aug 06 '14 at 16:45

Benjamin RD

11,516
14
87
157

Concatenating string with exception message

2 Answers2