Get Faces Affected by Draft Feature Example (C#)

//---------------------------------------------------------------------------
// Problem:
//       In SolidWorks, a feature is a collection of faces.
//       The faces created by a feature can be retrieved using
//       IFeature::GetFaces. However, certain types of features
//       only affect existing faces and do not create any new faces.
//       Examples of these types of features are draft and scale features.
//       For these features, IFeature::GetFaces returns an
//       empty array (no faces).
//
//       This sample code shows how to use IDraftFeatureData2::GetDraftedEntities
//       to get the faces affected by a draft feature.
//
// Preconditions:
// 1. Open a part or assembly with a draft feature.
// 2. Fully resolve the assembly.
// 3. Select a draft feature.
//
// Postconditions:
// 1. Draft feature is deselected.
// 2. Faces affected by the draft feature are selected.
// 3. The type of draft feature as defined in swDraftType_e
//    is printed to the Immediate window.
//----------------------------------------------------------------------------
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
namespace GetFacesForDraftFeature_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            SelectData swSelData = default(SelectData);
            Feature swFeat = default(Feature);
            DraftFeatureData2 swDraftFeat = default(DraftFeatureData2);
            object vEnt = null;
            object[] vEntArr = null;
            Entity swEnt = default(Entity);
            bool bRet = false;

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swSelData = (SelectData)swSelMgr.CreateSelectData();
            swFeat = (Feature)swSelMgr.GetSelectedObject6(1, -1);
            swDraftFeat = (DraftFeatureData2)swFeat.GetDefinition();

            // Type as defined in swDraftType_e
            Debug.Print(swDraftFeat.Type.ToString());

            swModel.ClearSelection2(true);

            // No need to roll back to get affected faces
            vEntArr = (object[])swDraftFeat.GetDraftedEntities();
            foreach (object vEnt_loopVariable in vEntArr)
            {
                vEnt = vEnt_loopVariable;
                swEnt = (Entity)vEnt;
                bRet = swEnt.Select4(true, swSelData);
            }
        }

        public SldWorks swApp;

    }
}