AOP – Method execution time watcher with PostSharp

Yan Cui

I help clients go faster for less using serverless technologies.

I found a nice usage of AOP the other day, using AOP to keep track of how long your method takes to execute and log a warning message if it takes longer than a threshold you supply. You can configure it to log execution times or only flag warning entries when threshold’s been exceeded.

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;
        var timeSpent = (DateTime.Now - start).TotalMilliseconds;

        if (LogDebug)
                "Method [{0}{1}] took [{2}] milliseconds to execute",

        if (timeSpent > Threshold)
                "Method [{0}{1}] was expected to finish within [{2}] milliseconds, but took [{3}] instead!",


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11 thoughts on “AOP – Method execution time watcher with PostSharp”

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  6. I have installed PostSharp. What is namespace of OnMethodInvocationAspect? And what is license I need to use it?

  7. You should use the free license. This post is out-of-date as the aspect class name is different now, try MethodInvocationAspect instead.

    Also, you don’t have to roll your own aspect for doing this either, I have rolled the time tracking aspect we used into a library called Metricano which you can download via Nuget.
    If you’re interested, this is how I ended up re-implementing the above aspect

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