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    <p><a href="https://stackoverflow.com/questions/7034659/net-replace-non-printable-ascii-with-string-representation-of-hex-code/7035386#7035386">The answer to another question</a> helped me to figure out a solution. I added a couple of extension methods for convenience:</p> <pre><code>public static string RemoveControlChars(this string s) { return Regex.Replace(s, @"(?![\r\n])\p{Cc}", ""); } public static void TraceEvent(this TraceSource trace, TraceEventType eventType, MyEvtEnum eventId, string message) { trace.TraceEvent(eventType, (int)eventId, message.RemoveControlChars()); } </code></pre> <p>I like the added benefit of not having to cast <code>MyEvtEnum</code> to <code>int</code> every time I call <code>TraceEvent</code> and it adds a natural overload, so this feels like a double win.</p> <p>It bothers me that I have to do this at all. One of the primary uses of a diagnostics system is to log Exceptions. Such a diagnostics system should be able to handle any string that an Exception message might contain. <s>I also lose line breaks, which is frustrating.</s> <strong>Edit:</strong> Losing line breaks was a side effect of <code>RemoveControlChars()</code>. I didn't realize that <code>\r</code> and <code>\n</code> are included as "control characters". I've updated my regular expression to not replace <code>\r</code> and <code>\n</code> characters.</p> <p>I don't like accepting my own answer, so if you have an alternate solution or an improvement to mine, please post it and if it's better, I'll accept it.</p>
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    1. COThat looks neat. And yes, I totally agree, this shouldn't happen. I suspect there's a way you can just replace control characters and leave linebreaks alone, too.
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