Question

I have a simple PostSharp logging attribute:

[Serializable] public class MethodLoggingAttribute : OnMethodBoundaryAspect {     private ILog _logger;     public override void OnEntry(MethodExecutionEventArgs eventArgs)     {         _logger = LogManager.GetLogger(eventArgs.Method.DeclaringType.ToString());         _logger.DebugFormat('Entered {0}', eventArgs.Method.Name);     } } 

I want to make this attribute more flexible by adding information about the methods arguments to the log entry, but only if its needed.

[Serializable] public class MethodLoggingAttribute : OnMethodBoundaryAspect {     private ILog _logger;     public override void OnEntry(MethodExecutionEventArgs eventArgs)     {         _logger = LogManager.GetLogger(eventArgs.Method.DeclaringType.ToString());          // if ShowParameters = true         _logger.DebugFormat('Entered {0} with args:{1}', eventArgs.Method.Name, args);         // else         _logger.DebugFormat('Entered {0}', eventArgs.Method.Name);         // endif     } } 

The pseudo code with the IF is what I’m not sure how to do. How can I pass this into the attribute? I’m expecting it to look something like this but I don know how to handle it inside the attribute code:

[MethodLogging(ShowParameters=true)] public void SomeCrazyMethod(int CustomerId, string SecretName) {...} 

Answer 1

Just declare a property

 [Serializable] public class MethodLoggingAttribute : OnMethodBoundaryAspect {     private ILog _logger;     public override void OnEntry(MethodExecutionEventArgs eventArgs)     {         _logger = LogManager.GetLogger(eventArgs.Method.DeclaringType.ToString());         if(ShowParameters = true)         {             _logger.DebugFormat('Entered {0} with args:{1}', eventArgs.Method.Name, args);         }         else         {             _logger.DebugFormat('Entered {0}', eventArgs.Method.Name);         }     }      private bool m_ShowParameters;      public bool ShowParameters     {         get { return m_ShowParameters; }         set { m_ShowParameters = value; }     } } 

Then you can specify it in the way you have mentioned.