Tracing in .NET CASENET Practice Questions (Page 6)

Questions 26–30

1. 26expert · hard

   A .NET Core service uses DiagnosticSource to emit custom events. The team wants to subscribe to these events and write them to a log file, but only when a specific feature flag is enabled. The service is already using ILogger for general logging. What is the most appropriate way to implement this?

   • ACreate a custom DiagnosticListener observer that checks the feature flag and writes events to a file using a TextWriter.
   • BUse ActivitySource.AddActivityListener to capture all activities and write them to a file.
   • CEnable the DiagnosticSource events by setting a TraceSwitch in the configuration file.
   • DUse ILogger to log the DiagnosticSource events directly from the business code.
   Reveal Solution Discussion Select an answer first
2. 27application · medium

   An ASP.NET application has application-level tracing enabled with localOnly="true". A developer needs to view trace details from a remote machine for troubleshooting. What should they do?

   • AChange localOnly to "false" in web.config and restart the application.
   • BUse a remote debugging tool to access the trace.axd endpoint on the server.
   • CEnable page-level tracing on the page and access it remotely.
   • DUse the Windows Event Viewer to view trace details remotely.
   Reveal Solution Discussion Select an answer first
4. 28foundation · easy

   Which class in .NET provides a simple on/off switch for tracing?

   • ABooleanSwitch
   • BSourceSwitch
   • CTraceSwitch
   • DSwitch
   Reveal Solution Discussion Select an answer first
5. 29application · medium

   A .NET application uses a TraceSource with a TextWriterTraceListener writing to a file. The file is growing very large, causing disk space issues. The team wants to limit the file size and keep only recent trace data. What should they do?

   • APeriodically delete the log file using a scheduled task.
   • BUse a custom TraceListener that implements file rotation and size limits.
   • CSet the TextWriterTraceListener's MaxFileSize property to a reasonable value.
   • DUse a TraceSwitch to reduce the verbosity of trace messages.
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A .NET Framework application currently writes trace output to a single log file. The security team requires that trace messages be written to the Windows Event Log for audit purposes, but only for a specific TraceSource. The application must continue writing to the existing file for all sources. What should you do?

   • AReplace the default TraceListener with an EventLogTraceListener in the system.diagnostics section.
   • BUse a TraceFilter on the EventLogTraceListener to only allow messages from the specific source.
   • CCreate a custom TraceListener that writes to both the file and the Event Log, and attach it to the specific source.
   • DAdd an EventLogTraceListener to the specific TraceSource's Listeners collection and keep the default listeners for other sources.
   Reveal Solution Discussion Select an answer first