Using PostSharp OnExceptionAspect across mulit projects - aop

Question

Good afternoon everyone,
I am trying to use the example "Aspect Oriented Programming Using C# and PostSharp" by Reza Ahmadi
http://www.codeproject.com/Articles/337564/Aspect-Oriented-Programming-Using-Csharp-and-PostS and dnrTV http://dnrtv.com/dnrtvplayer/player.aspx?ShowNum=0190 for the exception handling. Everything works great if the "OnExceptionAspect" is in the same project/assembly, however the event does not work if it I move the class to it own dll.
[assembly: ExceptionAspect (AttributePriority = 1)]
[assembly: ExceptionAspect(AttributePriority = 2, AttributeExclude = true, AttributeTargetTypes = "HpsErp.Common.AspectObject.*")]
namespace AspectObject
[Serializable]
public class ExceptionAspect : OnExceptionAspect
{
public override void OnException(MethodExecutionArgs args)
{
Trace.TraceError("{0} in {1}.{2}",
args.Exception.GetType().Name,
args.Method.DeclaringType.FullName,
args.Method.Name);
if (args.Instance != null)
{
Trace.TraceInformation("this={0}", args.Instance);
}
foreach (ParameterInfo parameter in args.Method.GetParameters())
{
Trace.TraceInformation("{0}={1}", parameter.Name,
args.Arguments[parameter.Position] ?? "null");
}
}
I also created a class in the external dll for "Timing" and it works great if I add a custom attribute to the class.
namespace AspectObject
[Serializable]
[MulticastAttributeUsage(MulticastTargets.Method)]
public class TimingAspect : OnMethodBoundaryAspect
{
[NonSerialized]
Stopwatch _StopWatch;
public override void OnEntry(MethodExecutionArgs args)
{
_StopWatch = Stopwatch.StartNew();
base.OnEntry(args);
}
public override void OnExit(MethodExecutionArgs args)
{
Console.WriteLine(string.Format("[{0}] took {1}ms to execute",
new StackTrace().GetFrame(1).GetMethod().Name,
_StopWatch.ElapsedMilliseconds));
base.OnExit(args);
}
Using AspectObject;
namespace MyApp
{
public class Car
{
[TimingAspect]
private void Drive()
{
//...
}
}
}
In the end, I am hoping to have this is multi dlls so that I can reuse it ie: wcf.
Thanks for any and all help...
James

Answer 1

You can access your aspects if they are stored in a separate DLL.
I always create a DLL class project called Aspects. In the projects I want AOP, I add a reference to that dll class. Then decorate your methods/class/assembly like you normally do.
https://github.com/sharpcrafters/PostSharp-Toolkits <-- good examples
http://researchaholic.com/tag/postsharp/ <-- some more examples, just uploaded an example