How to create custom event that inherits from command class - c#

Rhino Developer
1

Hello,

I’ve been struggling to subscribe a form to an event that originates in the rhino command class. I can accomplish this easily when using the existing events but I would like to produce a custom event that alerts me to the completion of a process within my own code.

Questions:

  1. Does a custom class need to inherit from the command class in order for a form to subscribe to it? (ie. CustomRhinoEvent : Rhino.Commands.CommandEventArgs) I understand that this might sound like a silly question but I ask because I have been trying to use higher level event arguments (ie. System.EventArgs) but have not successfully been able to subscribe a form to them when the event originates from a process based in the command class. The opposite (subscribing the command class to a form) does however work.

  2. If a custom class is actually needed to subscribe a form to a command class event, and that class must inherit from the command class eventargs then can someone please provide an example of this custom class?

  3. I could be totally wrong on the above - if so an example for producing a custom event based on System.EventArgs would be appreciated. I have tried but unfortunately have not been able to have a form subscribe to an event in Rhino when using these higher level events. All subscriptions compile successfully but at run time subscriptions are not found by the relevant OnEvent method.

I have been trying to write a custom event class but am receiving no constructor errors or errors that state member names cannot be the same as their enclosing type - each of which are starting to confuse me so examples would be greatly appreciated.

Thank you sincerely.

2

Can you provide some information on what you are trying to do and why? Perhaps this will allow us to be more helpful.

3

Tree,

I think the easiest approach for you would to use a Static Helper Class to manage the event(s) you want to create and invoke. Then you can access the event from your form or from within a Rhino Command.

Here is a complete sample that works the way you are hoping:

Pasted image1121×603 51.6 KB

Create a static class like this:

public static class EventHelper
{
    public static event EventHandler SphereCreated;

    public static void OnSphereCreated()
    {
        SphereCreated?.Invoke(null, EventArgs.Empty);
    }
}

Next add the handler to the OnSphereCreated event inside your form like this:

EventHelper.SphereCreated += EventHelper_SphereCreated;

Then you simply invoke the event from within your command or elsewhere like this:

EventHelper.OnSphereCreated();

Pasted image806×1188 47.1 KB

4

jStevenson!

Awesome - it works!

After two days of trying to find a solution, thank you very much for your help!

1 Like
5

Dale,

Thanks for the note. JStevenson’s answer worked.

Regarding what I’m trying to do - I have a slew of processes that get triggered from a form. I need to wait for those to complete before the form can continue doing its work so the custom event seemed useful. Hope this helps.