How to use window form button to select Revit element?

[peerawit.ru]

Hi everyone

I learning about how to create Revit add-in by Visual studio code.

I want to select Revit element via window form button but it seem like in not allow to access Revit when form open .

How to fix it?

Thank for your recommend.

[moturi.magati.george]

Hi @peerawit.ru,

There are a few forum questions on the same topic. They should get you started on the same.

https://forums.autodesk.com/t5/revit-api-forum/pickobject-from-windows-form-c/td-p/8021010

https://forums.autodesk.com/t5/revit-api-forum/revit-api-with-wpf/m-p/8209618

[Mohamed_Arshad · Accepted solution]

Hi @peerawit.ru 

To Display the Window form you have used ShowDialog(), Change ShowDialog() to Show(), Then Revit Will allow you to select the Elements.
One Important Note here, 
01. If you use Transactions then at Show() it will throw a Context Error. If there are no transactions you can use Show().
02. If you have transaction, You must implement the IExternalEventHandler interface and at Execute method, you have to write the Transaction.

03. And at the Form Button you have the raise the Event.

Kindly check the below links, It will help you with IExternalEventHandler Interface Implementation.
https://thebuildingcoder.typepad.com/blog/2015/12/external-event-and-10-year-forum-anniversary.html#... 

Hope this will resolve your issue 🙂

[peerawit.ru]

Thank you for your recommend.
I try to do follow this way but i found problem about Window form it allow to open another window when it open but I want to setting it can open only one.
How to solve that?

Thank a lot

[Mohamed_Arshad]

HI @peerawit.ru 
You are using a Button to open another Form right? At that button event method, you have close the existing form

using this.Hide() and then you have to open another form.

Hope this Helps.
If my understanding is wrong. Kindly Elaborate on your question.

[peerawit.ru]

I mean when use Form.Showdialog() it not allow to use command unless this form close.

But when use Form.Show() it allow to open form unlimit like this.

Can i setting for fix open just only one?

[Mohamed_Arshad]

HI @peerawit.ru 

To Disable Revit's Tab Button, You have to Implement IExternalCommandAvailability. Kindly Follow the below steps.
01. Declare a Static Form Variable and Implement IExternalCommandAvailability Interface

02. Write a Condition to Check whether the form is opened or not in Interface Method

03. Add the Availability Class in PushButton Data

Hope this will helps

[peerawit.ru]

Hi @Mohamed_Arshad
I'm newbie for C#
I try to create dimension in Revit when i use another command after then dimension is gone
I try to follow solution in link about transaction but i don't .
Do you have a sample ?