Getting the Id of an error in Elmah after calling .Raise()

Question

I\'m working on an MVC3 application and I\'m using Elmah to handle my error logging. What I want in my application is to carry the Elmah Id onto the custom error page as I will

Answer 1

After reading Dupin's comments it seems logical that it isn't quite possible. I tried digging around the Elmah source code and came up with a couple of alternatives that might be worth sharing.

The obvious alternative is stick with my original option of using the Logged event:

void ErrorLog_Logged(object sender, ErrorLoggedEventArgs args)
{
    string sessionId = Session.SessionID;
    Session["ElmahId_" + sessionId] = args.Entry.Id;
}

For a more direct solution it is possible to manually log the error with the following:

string errorId = Elmah.ErrorLog.GetDefault(HttpContext.Current)
    .Log(new Elmah.Error(filterContext.Exception));

However, using this approach won't hit your filters or mail module and so on.

After doing a bit of thinking and a little more searching, I came up with a new compromise. Still using the logged event but I've found a way to create a new unique key that can be passed to the view, by adding my own data to the exception.

string loggingKey = "ElmahId_" + Guid.NewGuid().ToString();
filterContext.Exception.Data.Add("LoggingKey", loggingKey);

This way I can pass the exception in my view model, which has this key value in the Data collection. The logged event would be changed to something like this:

void ErrorLog_Logged(object sender, ErrorLoggedEventArgs args)
{
    string key = args.Entry.Error.Exception.Data["LoggingKey"].ToString();
    Session[key] = args.Entry.Id;
}

Then in the view I get the key from the model to then pull the Id from the Session collection.