I use Nevron Diagram for .Net (Windows forms) to create an object model. I have subclassed shapes to hold my own objects. I want to store the NDocuments with their shapes and my own objects related to the shapes in one binary file.

I use one object, myModel, of my class Model containing all related objects and NDocuments.

Before serializing my model object with the following code:

  Dim fs As FileStream = New FileStream(filePath, FileMode.Create)

  Dim bf As New BinaryFormatter(Nothing, New StreamingContext(StreamingContextStates.File))

   bf.Serialize(fs, myModel)

   fs.Close()

the following code is executed on each NDocument:

aNDocument.OnSerializing()

To load the binary file, the following code is used:

 Dim fs As FileStream = New FileStream(filePath, FileMode.Open)

        Dim bf As New BinaryFormatter(Nothing, New StreamingContext(StreamingContextStates.File))

        mModel = bf.Deserialize(fs)

        fs.Close()

After the loading, the following code is executed on each NDocument:

aNDocument.OnDeserialized()

It works fine the first time. But after a second save and load the following error occurs on the OnDeserialized method:

System.Exception occurred

  Message=The element or one of its descendants has an invalid id

  Source=Nevron.System

  StackTrace:

       at Nevron.Dom.NElementIndex.Rebuild(INElement element)

       at Nevron.Diagram.NDocument.OnDeserialized()

       at SF.Model.OnDeserialized() in C:\Users\ET\Documents\Visual Studio 2010\Projects\SF5\SF5\Model.vb:line 786

  InnerException:

Looking at the documentation, I know that there is a Persistency Manager that can be used to save drawings to file but I need to save a whole graph of Nevron objects with my own objects.

I have also seen NReflector.UpdateReferences but I am not sure how and when to use it.

Could you help me?

Thanks

Eric