Tutorial :Autodesk Revit MEP 2010 .NET API C# room to door relation



Question:

Working with VS 2008 and Autodesk Revit MEP 2010 in C# I am trying to find out if a door is connecting to rooms:

ElementSetIterator elementsetiteratorBIMDoors =     bimdoors.getBIMDoors().ForwardIterator();    while (elementsetiteratorBIMDoors.MoveNext())  {      Autodesk.Revit.Element elementDoor =         elementsetiteratorBIMDoors.Current as Autodesk.Revit.Element;        if ((null != elementDoor.get_Parameter(BuiltInParameter.FROM_ROOM_ID)) &&           (null != elementDoor.get_Parameter(BuiltInParameter.TO_ROOM_ID)))      {          string sDoorFromRoomID =                 elementDoor.get_Parameter(BuiltInParameter.FROM_ROOM_ID).ToString();          string sDoorToRoomID =                 elementDoor.get_Parameter(BuiltInParameter.TO_ROOM_ID).ToString();            graph.addLink(new Link(sDoorFromRoomID, sDoorToRoomID));      }  }  

This approach does not work because the return value of elementDoor.get_Parameter(BuiltInParameter.FROM_ROOM_ID) is always null.

I have read on the Building Coder blog that

Built-in parameters are not an officially supported portion of API. In future we expect it will be replaced by data being properly exposed as a property.

Is that statement true? Can anyone point me to an efficient way to get the relation between doors and rooms?


Solution:1

Doors are family instances, so

Autodesk.Revit.Elements.FamilyInstance elementDoor = elementsetiteratorBIMDoors.Current as Autodesk.Revit.Elements.FamilyInstance;    Room fromRoom = elementDoor.FromRoom;  Room toRoom = elementDoor.ToRoom;  

should work for this.


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