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 == 1) 
                { 
                    using (Transaction tr = doc.TransactionManager.StartTransaction()) 
                    { 
                        Line line = tr.GetObject(ss[0].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; 
                } 
            } 
        } 
    }