how to put outlet in the wall?

[ferreirasou_gabriell]

I'm trying to create code to add an outlet to the wall. (Same as done in Revit's Systems tab)

when I run the code I get the following error

using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IExternalCommand1
{
[Transaction(TransactionMode.Manual)]
public class Class1 : IExternalCommand
{
public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIDocument uIDocument = commandData.Application.ActiveUIDocument;
Document document = uIDocument.Document;

#region

FilteredElementCollector outlet = new FilteredElementCollector(document);
outlet.OfClass(typeof(FamilySymbol)).OfCategory(BuiltInCategory.OST_ElectricalFixtures);
FamilySymbol familySymbol = outlet.FirstElement() as FamilySymbol;
ElementId elementId = new ElementId(308696);
Wall wall = document.GetElement(elementId) as Wall;
var reference = HostObjectUtils.GetSideFaces(wall, ShellLayerType.Interior).First();

using (Transaction transaction = new Transaction(document))
{
transaction.Start("add");

if (wall != null)
{
var instance = document.Create.NewFamilyInstance(reference,
new XYZ(13.3997604933275, -1.35161192601243, 9.0571329707487),
new XYZ(0, 0, 0),
familySymbol);
if (instance == null)
TaskDialog.Show("ERROR", "Instance is null!");
}

transaction.Commit();

}

#endregion

return Result.Succeeded;
}
}
}

[jeremy_tammik]

Hmm. I would suggest you browse this forum a bit and peruse the existing discussions on related topics. I searched a bit for you myself using the search keywords 'outlet', 'electrical' and 'place fixture'. I found a number of interesting closely related threads, but nothing that exactly fits yet. Most of the discussions are just one tiny step further advanced.

Next, your could try searching a bit further afield, e.g., using the entire Internet:

• https://duckduckgo.com/?q=revit+api+place+outlet

That turns up these useful-looking q&a's on StackOverflow:

• https://stackoverflow.com/questions/70550813/revit-api-c-sharp-script-placing-element-at-location-po...
• https://stackoverflow.com/questions/61322221/revit-api-c-sharp-insert-and-rotate-family

Moral? Search, search, search. Mostly more efficient than asking. Many experienced programmers still search a lot.

[mhannonQ65N2]

It looks like element 308696 is not a wall (or does not exist) in your model.

Try changing your line

Wall wall = document.GetElement(elementId) as Wall;

to a direct cast, so it will throw an invalid cast exception if the element is not a wall:

Wall wall = (Wall)document.GetElement(elementId);