双击CAD对象（具有扩展数据），显示自定义对话框实现方法

转自：Cad人生

链接：http://www.cnblogs.com/cadlife/p/3463337.html

题目：双击CAD对象，显示自定义对话框实现方法

内容粘贴如下：

 主要是绑定两个事件：一个是 Application.DocumentManager.DocumentLockModeChanged -----  该事件为文档锁定事件，一直在被监测中
                   一个是 Application.BeginDoubleClick                        -----  该事件为应用程序的双击事件

     class TlsApplication : IExtensionApplication //程序初始化，在加载dll时，cad会自动捕捉并运行该过程

     {
         void IExtensionApplication.Initialize()
         {
             TTest.Start();
         }
         void IExtensionApplication.Terminate()
         {
         }
     }

     class TTest
     {
         static bool m_Veto = false;
         public static void Start()
         {
             Application.DocumentManager.DocumentLockModeChanged += new DocumentLockModeChangedEventHandler(vetoCommand);
             Application.BeginDoubleClick += new BeginDoubleClickEventHandler(beginDoubleClick);
         }
         static void beginDoubleClick(object sender, BeginDoubleClickEventArgs e)
         {
             Document doc = Application.DocumentManager.MdiActiveDocument;
             Editor ed = doc.Editor;
             PromptSelectionResult res = ed.SelectImplied();
             SelectionSet ss = res.Value;
             if (ss != null)
             {
                 if (ss.Count == )
                 {
                     using (Transaction tr = doc.TransactionManager.StartTransaction())
                     {
                         Line line = tr.GetObject(ss[].ObjectId, OpenMode.ForRead) as Line;
                         if (line != null)
                         {
                             ResultBuffer rb = line.GetXDataForApplication("MyApp"); //提取对象的扩展数据
                             if (rb != null)
                             {
                                 m_Veto = true;
                             }
                         }
                     }
                 }
             }
         }

         static void vetoCommand(object sender, DocumentLockModeChangedEventArgs e)
         {
             if (e.GlobalCommandName.ToLower() == "properties") //判断是否是调用属性对话框
             {
                 if (m_Veto)
                 {
                     e.Veto();
                     Application.ShowAlertDialog("hello"); //在此处可以添加自定义对话框
                     m_Veto = false;
                 }
             }
         }
     }