Something like this should do the trick...
public class StopwatchAttribute : ActionFilterAttribute
{
private const string StopwatchKey = "StopwatchFilter.Value";
public override void OnActionExecuting(HttpActionContext actionContext)
{
base.OnActionExecuting(actionContext);
actionContext.Request.Properties[StopwatchKey] = Stopwatch.StartNew();
}
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
base.OnActionExecuted(actionExecutedContext);
Stopwatch stopwatch = (Stopwatch)actionExecutedContext.Request.Properties[StopwatchKey];
// TODO something useful with stopwatch.Elapsed
Trace.WriteLine("Elapsed = " + stopwatch.Elapsed);
}
}
Here we store a new Stopwatch in the request properties and stop it when the request has completed.
