topic Re: ExternalEvent.Raise() don't execute immediately mothod "Excute" in Revit API Forum

ExternalEvent.Raise() don't execute immediately mothod "Excute"

NhuTruong_BeyCons — Fri, 25 Jan 2019 06:46:27 GMT

Hi everybody,

I have a problem, I call ExternalEvent.Raise() but it doesn't execute immediately method "Execute" in ExternalEventHandler. In fact, RelayCommand complete, then "Execute" in ExternalEventHandler execute. Is there any way call Raise () and then immediately execute method "Execute"? Thank you.

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

Moustafa_K — Fri, 25 Jan 2019 21:16:13 GMT

Hi,

Please have a look on this link, some useful information and things to consider while useing external events.

https://thebuildingcoder.typepad.com/blog/2013/12/triggering-immediate-external-event-execute.html

Hope that helps

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

NhuTruong_BeyCons — Tue, 29 Jan 2019 07:45:32 GMT

Thank you for your help. I followed the following tutorial link

https://thebuildingcoder.typepad.com/blog/2016/03/implementing-the-trackchangescloud-external-event.html

, but the result of "Execute" still did not execute after Raise (). Please, helps me.

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

jeremytammik — Tue, 29 Jan 2019 08:38:00 GMT

You ask: Is there any way call Raise and then immediately execute method Execute?

I would say the answer is No.

Cheers,

Jeremy

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

NhuTruong_BeyCons — Tue, 29 Jan 2019 08:52:51 GMT

I checked with a simple example like the image, the result is count = 0, not count = 1

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

NhuTruong_BeyCons — Tue, 29 Jan 2019 09:05:07 GMT

Thank Jeremy,

So, do you have a way to use transactions outside of IExternalCommand, which works in order?

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

SamBerk — Tue, 26 Nov 2019 19:36:49 GMT

Hi @jeremytammik and @NhuTruong_BeyCons

Here is how I solved it:

When the first command to open the window is executed, I save a reference to the UIApplication in a static class from the commandData
And every time when I want to raise the event instead of using the event.Raise() I use eventHandler.Execute and I pass the UIApplication from the static class

eventHandler.Execute(StaticClass.UIApplication)

and it works successfully.

@jeremytammik do you think this is a safe way to go?

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

jeremytammik — Wed, 27 Nov 2019 07:55:56 GMT

That sounds fine to me. Congratulations on solving it!

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

SamBerk — Wed, 27 Nov 2019 16:02:01 GMT

So that means that I don't need this

https://thebuildingcoder.typepad.com/blog/2013/12/triggering-immediate-external-event-execute.html

complicated solution?

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

jeremytammik — Wed, 27 Nov 2019 17:57:46 GMT

If it works reliably for you under all circumstances, then not, obviously.

Please let us know, and I can add a note to that old post pointing out that there is a better way.

Thank you!

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

SamBerk — Fri, 29 Nov 2019 16:26:56 GMT

Hi @jeremytammik and @NhuTruong_BeyCons

I realized that this is not a complete solution, because it only works with read-only events, but if you want to use a transaction in the event it will throw an exception that "Starting a transaction from an external application running outside of API context is not allowed", it only works with event.Raise().

But in fact, if you wanna do a read-only event, you don't need an IExternalEventHandler and call eventHandler.Execute() at all, you just need to save a reference to the UIApplication in a static field from the commandData when the first command to open the window is executed, and then you can use the UIApplication wherever in your code you want to read data from Revit.

Thanks

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

jeremytammik — Fri, 29 Nov 2019 19:08:36 GMT

You can also shoot yourself in the foot.

Making calls to the Revit API outside of a valid Revit API context can corrupt your data and crash Revit.

You cannot "use the UIApplication wherever in your code you want to read data from Revit".

You can only make calls from within a valid Revit API context:

http://thebuildingcoder.typepad.com/blog/2015/08/revit-api-context-and-form-creation-errors.html#2

Re: ExternalEvent.Raise() don't execute immediately mothod "Excute"

434977268 — Thu, 05 Jan 2023 09:56:48 GMT

Hi,I want to ask if you have solved this problem now?