Revit crashes (wpf)

[vano96711]

Hello everyone. I have a problem when using WPF in revit api.
I use MVVM pattern. Revit crashes, when an unexpected exception occurs in ICommand. Try/catch in IExternalCommand doesn't help. Tried use AppDomain.CurrentDomain.UnhandledException and AppDomain.CurrentDomain.FirstChanceException. 

I also tried using WPF template without MVVM (https://thebuildingcoder.typepad.com/blog/2020/01/revit-wpf-add-ins-and-template.html). I put a "throw new Exception()" in the button click handler. Revit also shuts down.
How can I avoid this problem?

The user can work with large projects. I would hate to lose progress because of an unexpected error.

[vano96711]

Hello everyone. I have a problem when using WPF in revit api.
I use MVVM pattern. Revit crashes, when an unexpected exception occurs in ICommand. Try/catch in IExternalCommand doesn't help. Tried use AppDomain.CurrentDomain.UnhandledException and AppDomain.CurrentDomain.FirstChanceException. 

I also tried using WPF template without MVVM (https://thebuildingcoder.typepad.com/blog/2020/01/revit-wpf-add-ins-and-template.html). I put a "throw new Exception()" in the button click handler. Revit also shuts down.
How can I avoid this problem?

The user can work with large projects. I would hate to lose progress because of an unexpected error.

[Sean_Page]

Can you provide any portion of the code related to the error, the error message details, and a little more description of when / how the error occurs? I don't believe your current description "it isn't working" is really enough for anyone to be able to help you very well.

[Sean_Page]

Can you provide any portion of the code related to the error, the error message details, and a little more description of when / how the error occurs? I don't believe your current description "it isn't working" is really enough for anyone to be able to help you very well.

[3dimdev]

Do you have instances of Revit elements in your ViewModels which have properties bound to your UI?  Revit can (will always?) CTD when a binding attempts to access a Revit element that is no longer valid.

[3dimdev]

Do you have instances of Revit elements in your ViewModels which have properties bound to your UI?  Revit can (will always?) CTD when a binding attempts to access a Revit element that is no longer valid.

[Moustafa_K]

I recall I have given an example of how these works see this post.

let us know what was the error you experienced so we can be able to assist

[Moustafa_K]

I recall I have given an example of how these works see this post.

let us know what was the error you experienced so we can be able to assist