Tracing methods execution time

Question

I am trying to \"inject\" custom tracing methods in my application.

I want to make it as elegant as possible, without modifying to much of the existing code, and hav

Answer 1

You can trace method execution time easily with PostSharp (available as NuGet package). Code of custom method-level attribute that doing just that (taken from here):

  [Serializable]
  [DebuggerStepThrough]
  [AttributeUsage(AttributeTargets.Method)]
  public sealed class LogExecutionTimeAttribute : OnMethodInvocationAspect
  {
  private static readonly ILog Log = LogManager.GetLogger(typeof(LogExecutionTimeAttribute));

  // If no threshold is provided, then just log the execution time as debug
  public LogExecutionTimeAttribute() : this (int.MaxValue, true)
  {
  }
  // If a threshold is provided, then just flag warnning when threshold's exceeded
  public LogExecutionTimeAttribute(int threshold) : this (threshold, false)
  {
  }
  // Greediest constructor
  public LogExecutionTimeAttribute(int threshold, bool logDebug)
  {
    Threshold = threshold;
    LogDebug = logDebug;
  }

  public int Threshold { get; set; }
  public bool LogDebug { get; set; }

  // Record time spent executing the method
  public override void OnInvocation(MethodInvocationEventArgs eventArgs)
  {
    var start = DateTime.Now;
    eventArgs.Proceed();
    var timeSpent = (DateTime.Now - start).TotalMilliseconds;

    if (LogDebug)
    {
    Log.DebugFormat(
    "Method [{0}{1}] took [{2}] milliseconds to execute",
    eventArgs.Method.DeclaringType.Name,
    eventArgs.Method.Name,
    timeSpent);
    }

    if (timeSpent > Threshold)
    {
    Log.WarnFormat(
    "Method [{0}{1}] was expected to finish within [{2}] milliseconds, but took [{3}] instead!",
    eventArgs.Method.DeclaringType.Name,
    eventArgs.Method.Name,
    Threshold,
    timeSpent);
    }
  }