添加项目文件。

Sai.Toolkit.Revit/Assist/HostObjectAssist.cs

@@ -0,0 +1,46 @@
+using Autodesk.Revit.DB;
+
+using JetBrains.Annotations;
+
+namespace Sai.Toolkit.Revit.Assist;
+
+internal static class HostObjectAssist
+{
+    /// <summary>
+    ///     得到轮廓线（墙，板等）
+    /// </summary>
+    /// <param name="element"></param>
+    /// <returns></returns>
+    public static List<Sketch> GetSketch(this HostObject element)
+    {
+        var doc = element.Document;
+        List<Sketch> sketches = new();
+        using (SubTransaction subTransaction = new(doc))
+        {
+            subTransaction.Start();
+            var ids = doc.Delete(element.Id);
+            subTransaction.RollBack();
+            foreach (var id in ids)
+            {
+                if (doc.GetElement(id) is Sketch sketch)
+                {
+                    sketches.Add(sketch);
+                }
+            }
+        }
+
+        return sketches;
+    }
+    public static IList<Reference> GetBottomFaces(this HostObject host)
+    {
+        return HostObjectUtils.GetBottomFaces(host);
+    }
+    public static IList<Reference> GetSideFaces(this HostObject host, ShellLayerType side)
+    {
+        return HostObjectUtils.GetSideFaces(host, side);
+    }
+    public static IList<Reference> GetTopFaces(this HostObject host)
+    {
+        return HostObjectUtils.GetTopFaces(host);
+    }
+}