Extending System.Diagnostics tracing APIs

re: Extending System.Diagnostics tracing APIs

checlark — Sun, 14 May 2006 02:42:24 GMT

Sorry if this message is up here twice.

I am trying to run the code but I keep getting the cannot find type error for the EmailListener. I have checked the namespace and they are identical.

Any ideas or direction?

Thanks,
Che'

re: Extending System.Diagnostics tracing APIs

Che Clark — Sun, 14 May 2006 01:54:25 GMT

I am trying to run this code but keep getting the following error:

System.Configuration.ConfigurationErrorsException was unhandled
Message="Couldn't find type for class MsdnMagazine.Samples.Tracing.EMailListener ,Extensions."
Source="System"
BareMessage="Couldn't find type for class MsdnMagazine.Samples.Tracing.EMailListener ,Extensions."
Line=0
StackTrace:
at System.Diagnostics.TraceUtils.GetRuntimeObject(String className, Type baseType, String initializeData)
at System.Diagnostics.TypedElement.BaseGetRuntimeObject()
at System.Diagnostics.ListenerElement.GetRuntimeObject()
at System.Diagnostics.ListenerElementsCollection.GetRuntimeObject()
at System.Diagnostics.TraceSource.Initialize()
at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String format, Object[] args)
at System.Diagnostics.TraceSource.TraceInformation(String message)
at MsdnMagazine.Samples.Tracing.test.Main() in F:\CLRInsideOut0604\CLRIO\CLRInsideOut0604\Tests\test.cs:line 27
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

The namespace defined in the config matches exactly the namespace for the EmailListener class.

Any ideas or direction?

Thanks,
Che'

re: Extending System.Diagnostics tracing APIs

Krzysztof Cwalina — Sat, 22 Apr 2006 02:44:04 GMT

Max, you are right. It should be strData.Append(data[i].ToString());
Sorry for that and thanks for catching it.

re: Extending System.Diagnostics tracing APIs

Max Mulawa — Fri, 21 Apr 2006 22:53:38 GMT

Hi Krzysztof,

Really good article, will use EmailListener in my current development work. I'm not sure if in class TraceListener2 (Figure 2) in method

protected virtual string FormatData(object[] data)

you should change the If condition to

if (i != 0) strData.Append("|");
strData.Append(data[i].ToString());

to append pipe to the end of each string representation of the data[i] object.

I don't know if this is a mistake, but I thought it would be useful if I'm right.

re: Extending System.Diagnostics tracing APIs

Krzysztof Cwalina — Wed, 22 Mar 2006 01:46:11 GMT

Josh, this is a very cool idea. A twist on it would be to provide a listener that tracers to an RSS feed. You could subscribe to the feed and see, let's say, critical events in your blog reader.

re: Extending System.Diagnostics tracing APIs

Josh Einstein — Wed, 22 Mar 2006 01:33:24 GMT

Check out the custom trace listener I developed. It was mentioned in MSDN magazine before by someone from Wintellect but I thought you might want to give it a look cause it's very useful.

http://josheinstein.com/journal/archive/2005/06/08/520.aspx
http://josheinstein.com/journal/archive/2005/06/09/539.aspx

re: Extending System.Diagnostics tracing APIs

Krzysztof Cwalina — Mon, 20 Mar 2006 19:50:08 GMT

We don't currently support extending the TraceEventCache. But I think it's a good idea. I would appreciate if you could file it formally at http://lab.msdn.microsoft.com/ProductFeedback/. This way you could track the status of the request.

Thanks.

re: Extending System.Diagnostics tracing APIs

Alex — Mon, 20 Mar 2006 19:33:06 GMT

I would like to extend tracing, specifically TraceEventCache to have more data (for instance, windows identity, host, etc.). How do I do this?

re: Extending System.Diagnostics tracing APIs

Krzysztof Cwalina — Sat, 11 Mar 2006 11:36:04 GMT

If you want to ensure trace, try-finally seems to be the right choice. Why not?

But I would say that if an exception is thrown, you actually don't want the Exit event. An Enter event, optionally followed by a trace with the excetion, and the absence of the Exit event describe pretty well what actually happened.

re: Extending System.Diagnostics tracing APIs

Martin Aupperle — Fri, 10 Mar 2006 17:23:12 GMT

What happens when an exception is thrown? The trace code for leaving the function is not executed. In C++, where we have RAII, this is easily solved: put the trace call for leaving a function in the destructor of a class and have a local object of that class in every function.

What can be done in .NET? Introduce a try...finally block? Hope not.

Martin