Tracing in .NET CASENET Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which trace listener writes trace output to a text file?

   • AEventLogTraceListener
   • BConsoleTraceListener
   • CDefaultTraceListener
   • DTextWriterTraceListener
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2. 17application · medium

   A .NET Core application uses Activity to trace an incoming HTTP request. The application needs to ensure that all log messages within the request scope include the same activity ID. The team uses ILogger. What should they do?

   • AWrite the activity ID to a static field and reference it in every log call.
   • BAdd the activity ID to the ILogger scope using BeginScope and include it in the log message format.
   • CSet the Activity.IdFormat to Hierarchical and use it in the log message.
   • DUse Trace.CorrelationManager.ActivityId to set the activity ID for the current thread.
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4. 18expert · hard

   A .NET Framework application has a high-volume trace source that logs every method entry and exit. The performance team reports that tracing is causing significant overhead in production. The application uses a TraceSwitch set to Verbose. What is the most effective way to reduce overhead while still being able to diagnose issues?

   • AUse a custom listener that discards all messages except errors.
   • BRemove all trace calls from the code and rely on exception logging only.
   • CSet the Trace.AutoFlush property to false to reduce I/O overhead.
   • DChange the TraceSwitch level to Warning and guard verbose trace calls with if (traceSwitch.TraceVerbose) checks.
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5. 19expert · hard

   A .NET application writes trace output to a file using a TextWriterTraceListener. The application runs as a Windows service under a low-privilege account. The trace file is not being created, and no error is logged. What is the most likely cause?

   • AThe listener is not attached to the TraceSource's Listeners collection.
   • BThe service account does not have write permission to the directory where the trace file is located.
   • CThe TraceSource's switch is set to Off, so no messages are written.
   • DThe application is running in Release mode, so tracing is disabled.
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6. 20application · medium

   A .NET Framework application has a TraceSource with a single listener that writes to a file. The team wants to exclude trace events that originate from a specific method (e.g., 'HealthCheck') while keeping all other events. What is the most efficient way to achieve this?

   • ACreate a custom TraceFilter that examines the call stack and returns false when the method name is 'HealthCheck'.
   • BUse a BooleanSwitch named 'HealthCheck' and set it to false to disable that method's tracing.
   • CSet the TraceSource.Switch.Level to Error to suppress all non-error events, including HealthCheck.
   • DRemove the listener and add a new one that only writes events containing 'HealthCheck'.
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