Question

I’ve got an MVC application where I use Try-Catch blocks throughout and I’m looking for an easy way to implement activity/error-logging based on a global boolean field. Does anyone know a way I can ‘extend’ the functionality of the Try-Catch code in order to add my own activity/error logging without having to go through and touch every block?

For example:

I’d like the the Try to automatically log certain items to my DB such as url, action, ids, parameters, IP info, etc,…
And the Catch to automatically log it’s Exception to another table in the DB.

Thoughts? Recommendations?

Thanks,
Peter

Answer 1

Create your custom action filter and decorate controllers or action methods with it.

http://msdn.microsoft.com/en-us/library/dd381609.aspx

public class LoggingFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        filterContext.HttpContext.Trace.Write("(Logging Filter)Action Executing: " +
            filterContext.ActionDescriptor.ActionName);

        base.OnActionExecuting(filterContext);
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        if (filterContext.Exception != null)
            filterContext.HttpContext.Trace.Write("(Logging Filter)Exception thrown");

        base.OnActionExecuted(filterContext);
    }
}

Then use it

public class HomeController : Controller
{
    [LoggingFilter]
    public ActionResult Index() 
    {//...}
}