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(0, 0, 0), new XYZ(100, 0, 0));  
                          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(0, 100, 0), new XYZ(100, 100, 0));  
                        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。