Add fields to existing object data : .net

[newautocad123]

It is possible to add fields to the existing object data in a dwg file, with .net. Please suggest the way to add field to existing object data, if it is possible.

Thanks.

[norman.yuan]

Yes, it is possible using managed Map API:

Look into Autodesk.Gis.Map.ObjectData.FieldDefinitions.Add()/AddColumn() method.

In case you have not used managed MAp API:

1. In an Acad plug-in DLL project, set reference to ManagedMapApl.dll;

2. Write code to identify the target object data table

3. Create a FieldDefinition object;

4. Call Table.FieldDefinitions.AddColumn(myField)

5 If necessary, find all entities that has the target table record attached, and set value for the newly added field.

[huiz]

I've tried adding new field definitions to an existing table but it does not work. While debugging the code runs well, I don't get exceptions but the new field definition is not added.

myTable.FieldDefinitions.AddColumn(FieldDefinition.Create("Name", "Desc", "", myTable.FieldDefinitions.Count)

Do I need to update or commit something after this?

[huiz · Accepted solution]

A, found the solution. After adding new definitions you need to update the tables collection.

  myTables.UpdateTable(myTable.Name, myTable.FieldDefinitions)

[redtransitconsultants]

Thanks for posting this - just solved my issue. Should be marked as a solution.

[MGO-Norsyn]

A "Thank you" from the future for this solution!