Adding messages to trace log in WCF service?

If I have trace logging enabled on a WCF 开发者_JS百科service is it possible to write custom messages to it? If so how? If I don't have trace logging enabled will it just not write or will it throw an exception?

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You can use below code:

FileStream traceLog = new FileStream("C:\\log\\Traces.svclog",FileMode.OpenOrCreate);

TextWriterTraceListener myListener = new TextWriterTraceListener(traceLog);

Trace.Listeners.Add(myListener);

myListener.WriteLine("Sending trace information");

Trace.Flush();

myListener.Flush();