添加项目文件。

Szmedi.RvKits/MEPTools/FlipWorkplaneCmd.cs

@@ -0,0 +1,42 @@
+
+using Autodesk.Revit.Attributes;
+using Autodesk.Revit.DB;
+
+using Nice3point.Revit.Toolkit.External;
+
+using System;
+
+using System.Linq;
+
+namespace Szmedi.RvKits.MEPTools
+{
+    [Transaction(TransactionMode.Manual)]
+    [Regeneration(RegenerationOption.Manual)]
+    public class FlipWorkplaneCmd : ExternalCommand
+    {
+        public override void Execute()
+        {
+            ICollection<FamilyInstance> familyInstances;
+            if (UiDocument.Selection.GetElementIds().Count > 0)
+            {
+                familyInstances = UiDocument.Selection.GetElementIds().Select(Document.GetElement).OfType<FamilyInstance>().ToList();
+
+            }
+            else
+            {
+                familyInstances = UiDocument.SelectObjects<FamilyInstance>("请选择族实例");
+            }
+            Document.Invoke(
+                ts =>
+                {
+                    foreach (var ins in familyInstances)
+                    {
+                        if (ins.CanFlipWorkPlane)
+                        {
+                            ins.IsWorkPlaneFlipped = !ins.IsWorkPlaneFlipped;
+                        }
+                    }
+                });
+        }
+    }
+}