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GetElementIdIterator Method

Filtered Element Collector Get Element Id Iterator Method

Returns an element id iterator to the elements passing the filters.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
Syntax 
public FilteredElementIdIterator GetElementIdIterator()

Return Value

FilteredElementIdIterator
Exceptions
Exception Condition
InvalidOperationException The collector does not have a filter applied. Extraction or iteration of elements is not permitted without a filter.
Remarks
Calling this when you have an active iterator to this same collector will result in the first iterator being stopped by this call.
Example 
// Use a RoomFilter to find all room elements in the document. 
RoomFilter filter = new RoomFilter();

// Apply the filter to the elements in the active document
FilteredElementCollector collector = new FilteredElementCollector(document);
collector.WherePasses(filter);

// Get results as ElementId iterator
FilteredElementIdIterator roomIdItr = collector.GetElementIdIterator();
roomIdItr.Reset();
while (roomIdItr.MoveNext())
{
    ElementId roomId = roomIdItr.Current;
    // Warn rooms smaller than 50 SF
    Room room = document.GetElement(roomId) as Room;
    if (room.Area < 50.0)
    {
        String prompt = "Room is too small: id = " + roomId.ToString();
        TaskDialog.Show("Revit", prompt);
        break;
    }
}
See Also