PostRequestForElementTypePlacement结构墙

Question

I'm having a problem with the method uidoc.PostRequestForElementTypePlacement() . It seems that the method is always requesting to use the architectural placement instead of the structural one. Is there any way to call the structural wall/floor placement?

Or is it possible to wait for the user to place with the method en then set the parameter "Structural" to true afterwards? I'm not sure how to do this as the above method does not get executed immediately but instead when the user brings focus back to the Revit view.

Thanks in advance.

Edit, added minimal code:

using System;
using System.Collections.Generic;
using System.Linq;

using Autodesk.Revit.DB;
using Autodesk.Revit.DB.Events;
using Autodesk.Revit.UI;
using Autodesk.Revit.Attributes;

namespace Test2
{
    [TransactionAttribute(TransactionMode.Manual)]
    [RegenerationAttribute(RegenerationOption.Manual)]
    public class Test2 : IExternalCommand
    {
        List<ElementId> addedElementIds = new List<ElementId>();
        UIApplication _uiapp;

        public Result Execute(
            ExternalCommandData commandData,
            ref string message,
            ElementSet elements)
        {
            UIApplication uiApp = commandData.Application;
            Autodesk.Revit.ApplicationServices.Application app = uiApp.Application;
            UIDocument uiDoc = uiApp.ActiveUIDocument;
            Document doc = uiDoc.Document;
            _uiapp = uiApp;

            addedElementIds.Clear();

            WallType wallType = new FilteredElementCollector(doc).OfClass(typeof(WallType)).Cast<WallType>().Last();

            app.DocumentChanged += new EventHandler<DocumentChangedEventArgs>(OnDocumentChanged);

            uiDoc.PostRequestForElementTypePlacement(wallType);

            return Result.Succeeded;
        }

        void OnDocumentChanged(object sender, DocumentChangedEventArgs e)
        {
            addedElementIds.AddRange(e.GetAddedElementIds());

            Autodesk.Revit.ApplicationServices.Application app = _uiapp.Application;
            Document doc = _uiapp.ActiveUIDocument.Document;

            foreach (ElementId id in addedElementIds)
            {
                Element el = doc.GetElement(id);

                el.LookupParameter("Structural").Set(1);
            }

            app.DocumentChanged -= new EventHandler<DocumentChangedEventArgs>(OnDocumentChanged);
        }
    }
}

Answer 1

您可以使用与使用PromptForFamilyInstancePlacement放置族实例所描述的相同的方法，通过DocumentChanged事件来检索新创建的实例。

Answer 2

PostRequestForElementTypePlacement is described as delaying the actual request for placement of the family until "outside of the API". This (based on my experimentation) in a family whose parameters cannot be changed by the same program that placed it, and seems to ignore the event handler ".DocumentChanged" (since the document does not change until after the API is complete). Note that there is a bug in R2018 (verified by RevitAPIDocs, still there through 2018.3) which prevents "PromptForFamilyInstancePlacement" from being used, since "Esc" is returning a COMPLETE CANCEL to the API -- so there's no way to exit the placement tool without deleting the newly placed element. So your answer (per Jeremy's answer) is to use "PromptForFamilyInstancePlacement" on pre-2018 code.

(edit) OR BETTER YET, place the "PromptForFamilyInstancePlacement" inside a "try", with a "Catch Exception" -- apparently, this will catch the bogus exception created by the modification of the API. This is based on a posting by Jeremy Tamik on another site.