添加项目文件。

DotNet.Revit.ExternalEvent/DocumentExtension.cs

@@ -0,0 +1,24 @@
+using Autodesk.Revit.DB;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DotNet.Revit.ExternalEvent
+{
+    public static class DocumentExtension
+    {
+        public static void Invoke(this Document doc, Action<Transaction> action, string name = "INVOKE")
+        {
+            using (var tr = new Transaction(doc, name))
+            {
+                tr.Start();
+                action(tr);
+               
+                if (tr.GetStatus() == TransactionStatus.Started)
+                    tr.Commit();
+            }
+        }
+    }
+}