How to save and load the InternalID of a node in WPF Diagram (SfDiagram)?

In the WPF Diagram, by default, you are unable to serialize the InternalID of the node. However, the Key property is serializable and is preserved during the save and load process of a diagram. To save and load custom properties such as InternalID, you can use the DataMember attribute to make these properties serializable according to your requirements.

Conclusion
I hope you enjoyed learning about how to save and load the InternalID of a node in the WPF Diagram.
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