RE: Using Special Folders in App.Config

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

Hi Stewart,

I'm afraid there is no other way to create the trace log file in the temp
directory except using code.

Dim logFilename As String
Dim listener As TraceListener

logFilename = Path.Combine(Path.GetTempPath(), "my.log")
listener = New TextWriterTraceListener(logFilename)

Trace.Listeners.Add(listener)
Trace.WriteLine("App started: " & DateTime.Now)

I once tried using envrionment variable like this:
<add name="myListener" type="System.Diagnostics.TextWriterTraceListener,
system, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
initializeData="%temp%\my.log" />

But eventually the %temp% was not expanded to its real value at runtime
(the TextWriterTraceListener actually calls Path.GetFullPath of the path
specified in config file but that method won't expand the environment
variables).

So you need to add some code to config the listener at runtime to get the
log file written to user's temp directory.

Best regards,

Jie Wang

Microsoft Online Community Support

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