Select Entity in Drawing View Example (C#)

//----------------------------------------------------------------------------
// Preconditions:
// 1. Open a part or fully resolved assembly.
// 2. Verify that the specified template exists.
// 3. Select a face, edge, or vertex.
//
// Postconditions:
// 1. Creates a new drawing with three views.
// 2. Dimensions the selected face, edge, or vertex
//    in the first drawing view.
// 3. Examine the drawing.
//
// NOTE: The dimension is not guaranteed to be created if a face is selected.
//----------------------------------------------------------------------------
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 AddDimension_CSharp.csproj
{
    partial class SolidWorksMacro
    {
        public void Main()
        {
            const string sPathToTemplate = "C:\\ProgramData\\SolidWorks\\SOLIDWORKS 2016\\data\\templates\\drawing.drwdot";
            const double nYoffset = 0.01;
 
            ModelDoc2 swModel = default(ModelDoc2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            Entity swEnt = default(Entity);
 
            DrawingDoc swDraw = default(DrawingDoc);
            ModelDoc2 swDrawModel = default(ModelDoc2);
            View swView = default(View);
            double[] vOutline = null;
            DisplayDimension swDispDim = default(DisplayDimension);
 
            double nXpos = 0;
            double nYpos = 0;
 
            bool bRet = false;
 
            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swEnt = (Entity)swSelMgr.GetSelectedObject6(1, -1);
 
 
            if ((swEnt != null))
            {
                swDraw = (DrawingDoc)swApp.NewDrawing2((int)swDwgTemplates_e.swDwgTemplateCustom, sPathToTemplate, (int)swDwgPaperSizes_e.swDwgPaperA1size, 0.0, 0.0);
                swDrawModel = (ModelDoc2)swDraw;
 
                bRet = swDraw.Create3rdAngleViews2(swModel.GetPathName());
 
                swView = (View)swDraw.GetFirstView();
                swView = (View)swView.GetNextView();
 
                bRet = swView.SelectEntity(swEnt, false);
 
                // Work out where to place dimension -
                // midway across view and slightly above
                vOutline = (double[])swView.GetOutline();
                nXpos = (vOutline[0] + vOutline[2]) / 2.0;
                nYpos = vOutline[3] + nYoffset;
 
                // Create the dimension, even if the entity is not
                // visible in the drawing view
                swDispDim = (DisplayDimension)swDrawModel.Extension.AddDimension(nXpos, nYpos, 0.0, (int)swSmartDimensionDirection_e.swSmartDimensionDirection_Left);
 
            }
 
        }
 
        public SldWorks swApp;
    }
 
}