Hello dear Dynamo users, I am developing some custom nodes for my colleagues (C#). Nodes are developed with NodeModel approach NodeModel Case Study - Custom UI · GitBook and work with Civil3D. Version of Dynamo: [image] I works quite well except one thing. If I close .dyn file with some node fr…

Hi @ondrej.janota , You need to add a JSON constructor. See below: [image] UI Node Extra Output Ports Developers implement a json constructor that reuses the deserialized ports from the .dyn file.

Everytime I have seen this is has been due to a dependency conflict with newtonsoft or another component which Dynamo itself leverages, usually from a Revit add-in. Some things to try: Can you replicate the issue in Dynamo core? If so check your Dynamo log from core to see which references are in…

Hi @jacob.small , thanks for reply. I am new to Dynamo development, so I would appreciate more detailed info. What do you mean by Dynamo core. I do not use Revit at all, but I have it installed in my PC. I am using Dynamo under Civil3d. Thanks for more details Ondřej

Thanks for advice. It seems to work. Best Ondřej

Node model has duplicate In/Outputs when script reloaded

Developers

zachri.jensen October 8, 2025, 3:21pm 4

Hi @ondrej.janota,

You need to add a JSON constructor. See below:

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Node model has duplicate In/Outputs when script reloaded

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