revit 链接模型的图元获取

using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using System.Collections.Generic;
using System.Linq;

namespace RevitLinkElementExtractor
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.ReadOnly)]
    public class LinkElementCollector : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            var doc = commandData.Application.ActiveUIDocument.Document;

            foreach (RevitLinkInstance link in new FilteredElementCollector(doc)
                .OfClass(typeof(RevitLinkInstance)))
            {
                TaskDialog.Show("链接模型", link.Name);

                var linkDoc = link.GetLinkDocument();
                var elementsInLink = new FilteredElementCollector(linkDoc)
                    .WhereElementIsNotElementType();

                ProcessElements(elementsInLink.ToElements(), link.Name);
            }

            return Result.Succeeded;
        }

        private void ProcessElements(IEnumerable<Element> elements, string linkName)
        {
            var count = new Dictionary<string, int>();
            foreach (var e in elements)
            {
                var typeName = e.GetType().Name;
                if (count.ContainsKey(typeName)) count[typeName]++;
                else count.Add(typeName, 1);
            }

            TaskDialog.Show("图元统计", string.Join("\n",
                count.Select(p => $"{p.Key}: {p.Value}")));
        }
    }
}