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I am looking for a way to add and remove a TraceListener for all existing TraceSources. (I am not sure my approach is correct here, what other ways could I use? Basically I want to log all trace output into a file that uses the current project name as filename. Whenever a user creates or reopens a project, I want to append logs to the correct file. There can only be one project open at a time.) Code example: I create several TraceSources in my application, one for each class public class Class1 { private static readonly System.Diagnostics.TraceSource trace = new System.Diagnostics.TraceSource("Class1"); } public class Class2 { private static readonly System.Diagnostics.TraceSource trace = new System.Diagnostics.TraceSource("Class2"); } I now want to add or remove a traceListener to all my traceSources at Runtime, like this: private System.Diagnostics.TextWriterTraceListener myListener; private onProjectOpen() { // user created a new project or opened an existing one myListener = new System.Diagnostics.TextWriterTraceListener("log-"+projectname+".log"); ALL_TRACESOURCES.Add ( myListener) ; // <-- how to do this? } private onProjectClose() { // user closed a project ALL_TRACESOURCES.Remove( myListener) ; // <-- how to do this? myListener.Flush(); myListener.Close(); myListener.Dispose(); // <-- not sure if all this is neccessary } So far I found no way to do this without making all my traceSources public (seems like a bad idea) and then listing all my classes like this: Class1.Trace.Add( myListener ); Class2.Trace.Add( myListener ); ... which seems like a bad design choice on several levels. Or Add all my TraceSources to a custom global collection in the constructor of each class (Easy to forget / mess up; and global variables are bad ) <p

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