Event Handler

[sragan]

I'm still somewhat of a beginner, and I've been trying all morning to get my first event handler working, with no luck.   I've been following this example code:

  IExternalEventHandler handler_event
    = new ExternalEventMy();
 
  ExternalEvent exEvent
    = ExternalEvent.Create( handler_event );

The external event handler class implements the actions I need to execute in a valid Revit API context:

  class ExternalEventMy : IExternalEventHandler
  {
    public void Execute(UIApplication uiapp)
    {
      UIDocument uidoc = uiapp.ActiveDocument;
      if( null == uidoc )
      {
        return; // no document, nothing to do
      }
      Document doc = uidoc.Document;
      using( Transaction tx = new Transaction(doc))
      {
        tx.Start("MyEvent");
        // Action within valid Revit API context thread
        tx.Commit();
      }
    }
    public string GetName()
    {
      return "my event";
    }
  }

I can raise the external event from another thread like this:

  exEvent.Raise();

Which is posted here:  The Building Coder: External Events and 10 Year Forum Anniversary (typepad.com)

But I can't get it to compile.  It doesn't seem to recognize the Class "ExternalEventMy" on the very first line of the code. 

I'm trying to run this with the Macro Editor, and I thought all the code for the class ExternalEventMy should go in the main module, just after the startup regions.  But that gives a "Namespace can not be found" error message.  

So I tried to put it in with the Window1.xaml.cs, but then the compiler gives me a "Non-static field" error.

I've included a couple of screen shots and a zip of the .sln file.  Any help would be appreciated. I'm trying to trigger this event from a WPF window, if that makes any difference.  

[jeremytammik]

Welcome to the Revit API.

Please start with something simpler that you can compile.

The Building Coder provides tutorials and lots of getting started material:

https://thebuildingcoder.typepad.com/blog/about-the-author.html#2

If you want to work with macros rather than with add-ins, please take a look at the numerous YouTube tutorials on getting started with Revit macros.

I recommend not struggling with external events until you can easily compile and execute the step by step tutorial material.

[sragan · Accepted solution]

Jeremy;

Maybe I overstated the beginner part a little.   I should have stated that I'm a beginner at External Events, and I thought I was probably missing something simple, which was the case.  Anyhow I seem to have it working now.

I finally got a Macro to put a WPF window and a Modeless Form side by side with either one triggering the same external event to modify Revit.   That was pretty neat.  But the moment of truth was when I deleted the Form just to make sure everything worked without it.