Filter for Doors with specific FromRoom or ToRoom values

By Saikat Bhattacharya

Is there a way to filter for doors with specific FromRoom or ToRoom values?

The following code snippet shows how we can create a filter for doors in a Revit model which have a specific ToRoom value set to a room name. This code can be modified and extended for specific requirements.

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
 
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
 
namespace Revit.SDK.Samples.HelloRevit.CS
{
  [Transaction(TransactionMode.Manual)]
  public class Command : IExternalCommand
  {
    public Result Execute(ExternalCommandData commandData,
      ref string message,
      ElementSet elements)
    { 
      Document doc = 
        commandData.Application.ActiveUIDocument.Document;
 
      FilteredElementCollector coll = 
        new FilteredElementCollector(doc)
        .OfCategory(BuiltInCategory.OST_Doors)
        .OfClass(typeof(FamilyInstance));
 
      IEnumerable doors = 
        from FamilyInstance f in coll 
        where f.ToRoom.Name == "Room 1" 
        select f;
 
      foreach (FamilyInstance door in doors)
      {
        TaskDialog.Show("Door Name", door.Name);
      }
       return Result.Succeeded;
    }
  }         
}

While working with doors and rooms using the API, this blog-post might also be relevant to review, while on this topic.