Invalid Entity when setting extensible storage using Revit 2025 api

[rtejada]

Hi everyone

I am following help article https://help.autodesk.com/view/RVT/2025/ENU/?guid=Revit_API_Revit_API_Developers_Guide_Advanced_Topi...

 I have the next code

Public Sub SetDocOfflineKey(ByVal docItem As Document, ByVal url As String)
  Using t As New Transaction(docItem, "MyStorage")
        t.Start()
         Dim collector As New FilteredElementCollector(docItem)
         Dim myDataStorage As Element = collector.OfClass(GetType(DataStorage)).FirstElement
         Dim myEntity As Entity
           If myDataStorage Is Nothing Then
                  myDataStorage = DataStorage.Create(docItem)
                  myEntity = New Entity(GetSchema)
           Else
                  myEntity = myDataStorage.GetEntity(GetSchema)
           End If
           myEntity.Set("CheckOutSourceUrl", url)  'here it fails
           myDataStorage.SetEntity(myEntity)
           t.Commit()
   End Using
End Sub

Private Function GetSchema() As Schema
     Static Dim mySchema As Schema
     If mySchema Is Nothing Then
     Dim schemaGuid As Guid = New Guid("{9DBE0174-AA01-4CDD-BA86-96DE1FDCE148}")
     mySchema = Schema.Lookup(schemaGuid)
     If mySchema Is Nothing Then
         Dim schemaBuilder As New SchemaBuilder(schemaGuid)
          schemaBuilder.SetSchemaName("MyStorage")
          schemaBuilder.SetWriteAccessLevel(ExtensibleStorage.AccessLevel.Public)
           schemaBuilder.SetReadAccessLevel(ExtensibleStorage.AccessLevel.Public)
           schemaBuilder.AddSimpleField("CheckOutSourceUrl", GetType(String))
            Return schemaBuilder.Finish
      Else
      Return mySchema
     End If
   Else
 Return mySchema
 End If
End Function

The above code throw the exception  "The entity is invalid" at the myEntity.Set("CheckOutSourceUrl", url) line  above. It works for all previous Revit api ( at least 2018 - 2024)

I am wondering if something extra needs to be done with this version

Your help is much appreciated

[jeremy_tammik]

AddSimpleField returns a FieldBuilder object. Maybe you need to call SetSpec and SetDocumentation on that, like in the sample code you point out.

[rtejada]

Hi Jeremy, thanks for your fast response, I tried your suggestion,  did not work. Thanks again