Create wall Example updated to 2017 - (Untested code WARNING)

gistfile1.txt

namespace CreateRevitPanel
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using Autodesk.Revit.DB;
    using Autodesk.Revit.DB.Architecture;
    using Autodesk.Revit.UI;
    using Autodesk.Revit.UI.Selection;
    using Autodesk.Revit.ApplicationServices;
    using Autodesk.Revit.Attributes;
    using Autodesk.AutoCAD.Geometry;


    [TransactionAttribute(TransactionMode.Manual)]
    [RegenerationAttribute(RegenerationOption.Manual)]
    public class Lab1PlaceGroup : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            UIApplication uiapp = commandData.Application;
            UIDocument uidoc = uiapp.ActiveUIDocument;
            Application app = uiapp.Application;
            Document doc = uidoc.Document;

            // Build a wall profile for the wall creation 

            XYZ[] pts = new XYZ[] {
            XYZ.Zero,
            new XYZ( 20, 0, 0 ),
            new XYZ( 20, 0, 15 ),
            new XYZ( 10, 0, 30 ),
            new XYZ( 0, 0, 15 )
            };

            // Get application creation object 

            Autodesk.Revit.Creation.Application appCreation = app.Create;

            // Create wall profile
            //CurveArray profile = new CurveArray();

            IList<Curve> profile = new List<Curve>();

            XYZ q = pts[pts.Length - 1];

            foreach (XYZ p in pts)
            {
                profile.Add(Line.CreateBound(q, p));
                q = p;
            }

            XYZ normal = XYZ.BasisY;

            WallType wallType = new FilteredElementCollector(doc)
                                    .OfClass(typeof(WallType))
                                    .First<Element>()
                                     as WallType;

            Level level = new FilteredElementCollector(doc)
                                    .OfClass(typeof(Level))
                                    .First<Element>(e => e.Name.Equals("Level 1"))
                                    as Level;

            Transaction trans = new Transaction(doc);

            trans.Start("Create Gable Wall");

            // Wall wall = doc.Create.NewWall(profile, wallType, level, true, normal);

            Wall wall = Wall.Create(doc, profile, false);

            trans.Commit();

            return Result.Succeeded;

        }
    }
}