Revit 模态框

非模态窗口有一个好处，就是可以一直停留在程序之前，然后持续完成操作。但是在Revit二次开发中，非模态窗口也有几个注意事项。

1、需要在文档关闭的时候，把非模态窗口也关闭掉，不然会导致文档关闭，窗口还在这样奇怪的Bug。

2、非模态的窗口的事件需要在IExternalCommand里注册。

3、每个操作必须在外部事件里进行。

以下代码关注后两个注意事项，第一个用上Document事件即可解决。

首先在IExternalCommand注册事件。

public class Command : IExternalCommand
   {
       public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
       {
           try
           {
            ExecuteEventHandler executeEventHandler = new ExecuteEventHandler("Creat Model Line");
            ExternalEvent externalEvent = ExternalEvent.Create(executeEventHandler);
            // show UI
            ModelessView modelessView = new ModelessView(executeEventHandler, externalEvent);                

               //窗口一直显示在主程序之前
               System.Windows.Interop.WindowInteropHelper mainUI = new System.Windows.Interop.WindowInteropHelper(modelessView);
               mainUI.Owner = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;
               modelessView.Show();  

               return Autodesk.Revit.UI.Result.Succeeded;
           }
           catch (Exception e)
           {
               message = e.Message;
               return Autodesk.Revit.UI.Result.Failed;
           }
       }
   }  

然后写一个通用的外部事件。

public class ExecuteEventHandler : IExternalEventHandler
   {
       public string Name { get;private set; }  

       public Action<UIApplication> ExecuteAction { get; set; }  

       public ExecuteEventHandler(string name)
       {
           Name = name;
       }  

       public void Execute(UIApplication app)
       {
           if(ExecuteAction!=null)
           {
               try
               {
                   ExecuteAction(app);
               }
               catch
               { }
           }
       }  

       public string GetName()
       {
           return Name;
       }
   }  

接下来，通过控件来实现创建构件。

public partial class ModelessView : Window
    {          

        ExecuteEventHandler _executeEventHandler= null;
        ExternalEvent _externalEvent = null;  

        public ModelessView(ExecuteEventHandler executeEventHandler,ExternalEvent externalEvent)
        {
            InitializeComponent();
            _executeEventHandler = executeEventHandler;
            _externalEvent = externalEvent;
        }  

        private void creatLine_Click(object sender, RoutedEventArgs e)
        {
            if(_externalEvent!=null)
            {
                _executeEventHandler.ExecuteAction = new Action<UIApplication>((app) =>
                  {
                      if (app.ActiveUIDocument == null || app.ActiveUIDocument.Document == null)
                          return;  

                      Document revitDoc = app.ActiveUIDocument.Document;
                      using (Transaction transaction=new Transaction(revitDoc,"Creat Line1"))
                      {
                          transaction.Start();
                          Autodesk.Revit.DB.Line line = Autodesk.Revit.DB.Line.CreateBound(new XYZ(, , ), new XYZ(, , ));
                          SketchPlane sketchPlane = SketchPlane.Create(revitDoc, Plane.CreateByNormalAndOrigin(XYZ.BasisZ, XYZ.Zero));
                          revitDoc.Create.NewModelCurve(line as Curve, sketchPlane);
                          transaction.Commit();
                      }
                  });
                _externalEvent.Raise();
            }
        }  

        private void creatLine2_Click(object sender, RoutedEventArgs e)
        {
            if (_externalEvent != null)
            {
                _executeEventHandler.ExecuteAction = new Action<UIApplication>((app) =>
                {
                    if (app.ActiveUIDocument == null || app.ActiveUIDocument.Document == null)
                        return;  

                    Document revitDoc = app.ActiveUIDocument.Document;
                    using (Transaction transaction = new Transaction(revitDoc, "Creat Line2"))
                    {
                        transaction.Start();
                        Autodesk.Revit.DB.Line line = Autodesk.Revit.DB.Line.CreateBound(new XYZ(, , ), new XYZ(, , ));
                        SketchPlane sketchPlane = SketchPlane.Create(revitDoc, Plane.CreateByNormalAndOrigin(XYZ.BasisZ, XYZ.Zero));
                        revitDoc.Create.NewModelCurve(line as Curve, sketchPlane);
                        transaction.Commit();
                    }
                });
                _externalEvent.Raise();
            }
        }
    }  

这就是一个简单的非模态窗口实现的办法。