显示Revit任务对话框

[Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Automatic)]
class TaskDialogExample : IExternalCommand
{
     public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,ref string message, Autodesk.Revit.DB.ElementSet elements)

     {
         Application app = commandData.Application.Application;
         Document activeDoc = commandData.Application.ActiveUIDocument.Document;
         TaskDialog mainDialog = new TaskDialog("Hello, Revit!");
         mainDialog.MainInstruction = "Hello, Revit!";
         mainDialog.MainContent =
         "This sample shows how to use a Revit task dialog to communicate with the user."
         + "The command links below open additional task dialogs with more information.";
         mainDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink1,
         "View information about the Revit installation");
         mainDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink2,
         "View information about the active document");
         mainDialog.CommonButtons = TaskDialogCommonButtons.Close;
         mainDialog.DefaultButton = TaskDialogResult.Close;
         mainDialog.FooterText =
         "<a href=\"http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2484975 \">"
         + "Click here for the Revit API Developer Center</a>";
         TaskDialogResult tResult = mainDialog.Show();
         if (TaskDialogResult.CommandLink1 == tResult)
         {
             TaskDialog dialog_CommandLink1 = new TaskDialog("Revit Build Information");
             dialog_CommandLink1.MainInstruction =
             "Revit Version Name is: " + app.VersionName + "\n"
             + "Revit Version Number is: " + app.VersionNumber + "\n"
             + "Revit Version Build is: " + app.VersionBuild;
             dialog_CommandLink1.Show();
         }

         else if (TaskDialogResult.CommandLink2 == tResult)
         {
             TaskDialog.Show("Active Document Inforamtion",
             "Active document: " + activeDoc.Title + "\n"
             + "Active view name: " + activeDoc.ActiveView.Name);
         }

         return Autodesk.Revit.UI.Result.Succeeded;
     }
}