Handling exceptions in MVC with Postsharp

Question

Handling exceptions with MVC + Postsharp. This is my project architecture

MVC Project ->>> Business Layer ->>> DataLayer

MVC Project (Added custom filter in Global file and created a Base Controller to catch exceptions.)

Business Layer (middleware)

DataLayer (connects to Postgres database server and fetches data.)

In the DataLayer I have added PostSharp to handle exceptions from the database side and logged/email using NLog. Now from here I want to tell MVC Exception pipeline to display proper message to User that some exception has occured. So I use

args.FlowBehavior = FlowBehavior.ThrowException;

Now I catching this exception at MVC OnException method.

ISSUE : I am also logging and sending email on exception at MVC Exception method as well for any exceptions occuring at MVC side.

Now the problem is I have already logged and sent email for the exeption which was handled by Postsharp and now when it reaches at MVC Exception handler will do that again.

How can I know at MVC that the exception has already been logged. Can I do anything at Postsharp end like send some arguments in that which I can check at MVC Exception handler.

Please suggest a solution or guide to resolve this issue

Batavia Batavia · Accepted Answer · 2016-07-17T06:14:38

why are you trying to handle the exceptions in 2 places. Just pick either postsharp or the global MVC onException.

Alternatively, you could wrap the exception in a new exception. For example in postsharp you could say something like this

MyAspect : OnMethodBoundaryAspect {

    public override OnException (MethodExecutionArgs args) {
        ///your code to handle the exception here
        throw new HandledExceptin(args.Exception);
    }
}

Handling exceptions in MVC with Postsharp

1 Answers