Get subcomponents from familyinstance

[oyvind.knappskog.olsen]

Hi

How can I get the subcomponents from the 3 familyinstances in the file attached?

I have tried the GetSubcomponents method but it returns 0.

Regards

Øyvind Knappskog Olsen

Norconsult Informasjonssystemer AS

[JimJia]

Dear Øyvind Knappskog Olsen,
Per our investigation, these three elements are AssemblyInstance but not FamilyInstance, so you can use AssemblyInstance.GetMemeberIds() to retrieve the sub components.

[Mustafa.Salaheldin]

Thanks to @JimJia. I've prepared a sample code to do the job:

#region Namespaces

using System;
using System.Text;
using System.Linq;
using System.Xml;
using System.Reflection;
using System.ComponentModel;
using System.Collections;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Media.Imaging;
using System.Windows.Forms;
using System.IO;

using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.Attributes;

using Autodesk.Revit.DB;
using Autodesk.Revit.DB.Events;
using Autodesk.Revit.DB.Architecture;
using Autodesk.Revit.DB.Structure;
using Autodesk.Revit.DB.Mechanical;
using Autodesk.Revit.DB.Electrical;
using Autodesk.Revit.DB.Plumbing;

using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.UI.Events;

//using Autodesk.Revit.Collections;
using Autodesk.Revit.Exceptions;
using Autodesk.Revit.Utility;

using RvtApplication = Autodesk.Revit.ApplicationServices.Application;
using RvtDocument = Autodesk.Revit.DB.Document;
using System.Diagnostics;

#endregion

namespace RevitAddinCS2
{
    [Transaction(TransactionMode.Manual)]
    [Regeneration(RegenerationOption.Manual)]
    public class ExtCmd : IExternalCommand
    {
        #region Cached Variables

        private static ExternalCommandData _cachedCmdData;

        public static UIApplication CachedUiApp
        {
            get
            {
                return _cachedCmdData.Application;
            }
        }

        public static RvtApplication CachedApp
        {
            get
            {
                return CachedUiApp.Application;
            }
        }

        public static RvtDocument CachedDoc
        {
            get
            {
                return CachedUiApp.ActiveUIDocument.Document;
            }
        }

        #endregion

        #region IExternalCommand Members

        public Result Execute(ExternalCommandData cmdData, ref string msg, ElementSet elemSet)
        {
            _cachedCmdData = cmdData;

            FilteredElementCollector collectorAssemblyInstance = new FilteredElementCollector(CachedDoc);

            collectorAssemblyInstance.OfClass(typeof(AssemblyInstance));

            List<AssemblyInstance> AssemblyInstances = collectorAssemblyInstance.Cast<AssemblyInstance>().ToList();

            StringBuilder sb = new StringBuilder();

            foreach (AssemblyInstance ai in AssemblyInstances)
            {
                sb.AppendLine(string.Format("Assembly {0} contains:", ai.Name));
                sb.AppendLine(string.Format("======================"));

                List<ElementId> members = ai.GetMemberIds().ToList();

                foreach(ElementId id in members)
                {
                    sb.AppendLine(string.Format("\tElement with Id: {0}", id.ToString()));
                }
            }

            TaskDialog.Show("Revit", sb.ToString());
            return Result.Succeeded;
        }

        #endregion
    }
}

If this code satisfies your need pleas mark this reply as an answer.

[JimJia]

Dear Øyvind Knappskog Olsen,

Did you get chance to verify this case? do you think we can close this now?