添加项目文件。

DotNet.Revit.ExternalEvent/CmdExternalEvent.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Autodesk.Revit.DB;
+using Autodesk.Revit.UI;
+using Autodesk.Revit.Attributes;
+using DotNet.Revit.ExternalEvent;
+using System.Windows.Interop;
+using Autodesk.Windows;
+
+namespace DotNet.Revit.ExternalEvent
+{
+    [Transaction(TransactionMode.Manual)]
+    public class CmdExternalEvent : IExternalCommand
+    {
+        private static CmdExternalEvent m_Instance;
+        private ExternalEventHelper m_ExternalEventHelper;
+
+        public static CmdExternalEvent Instance
+        {
+            get { return m_Instance; }
+        }
+
+        public ExternalEventHelper ExternalEventHelper
+        {
+            get { return m_ExternalEventHelper; }
+        }
+
+
+        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
+        {
+            m_Instance = this;
+            m_ExternalEventHelper = new ExternalEventHelper(commandData.Application);
+    
+
+            var main = new MainWinodow();
+            var mainHelper = new WindowInteropHelper(main);
+            mainHelper.Owner = ComponentManager.ApplicationWindow;
+            main.Show();
+
+            return Result.Succeeded;
+        }
+
+    }
+
+}