Revit二次开发之ExternalEvent实现非模态窗体
Revit从2013版之后就不允许在外部窗体下直接开启事务，当然我们可以使用模态窗体阻止线程的运行，其实说白了窗体不就是用户与程序的交互界面么，在窗体上设置好数据然后传递给主程序么，但是我们需要更强的数据交互功能，或者连续的命令调用。那么这个时候模态窗体就显得非常笨拙了，好在RevitAPI给我们提供了两个外部事件，一个是Idling,一个是ExternalEvent，那么上篇我们已经讲过Idling事件了，这里就不在赘述了，接下来我们使用ExternalEvent实现非模态窗体命令，其实很简单哦！——兵者，诡道也！故能而示之不能，用而示之不用，近而示之远，远而示之近。所以不要怕问题，大不了兵来将挡，水来土掩而已！
类代码
using Autodesk.Revit.UI;
using Autodesk.Revit.DB;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.UI.Events;
namespace HelloWorld
{
[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class Test : IExternalCommand
{
public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIApplication uiApp = commandData.Application;
UIDocument uiDoc = uiApp.ActiveUIDocument;
Document Doc = uiDoc.Document;
Form1 frm = new Form1();
frm.Show();
return Result.Succeeded;
}
}
}
窗体代码
using System.Windows.Forms;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB;
namespace HelloWorld
{
public partial class Form1 : System.Windows.Forms.Form
{
ExecuteEvent Exc = null;
ExternalEvent eventHandler = null;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Exc = new ExecuteEvent();
eventHandler = ExternalEvent.Create(Exc);
}
private void button1_Click(object sender, EventArgs e)
{
eventHandler.Raise();
}
}
//新建一个类 继承 IExternalEventHandler接口
public class ExecuteEvent : IExternalEventHandler
{
public void Execute(UIApplication app)
{
Document doc = app.ActiveUIDocument.Document;
UIDocument uidoc = app.ActiveUIDocument;
Reference refer = uidoc.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element, "");
Transaction ts = new Transaction(doc,"BIM");
ts.Start();
Element elem = doc.GetElement(refer);
doc.Delete(elem.Id);
ts.Commit();
}
//估计是记录外部事件名称的 和事务名称相同
public string GetName()
{
return "this is a Test";
}
}
}
