Sectioned ListView for Android Using Mono C#

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

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

namespace FoodTypeSectionList
{
    public class SectionedListAdapter : BaseAdapter<ListSection>
    {
        private const int TYPE_SECTION_HEADER = 0;
        private Context _context;
        private List<ListSection> _sections;
        private LayoutInflater _inflater;
        public SectionedListAdapter(Context context) : base()
        {
            _context = context;
            _sections = new List<ListSection>();
            _inflater = LayoutInflater.From(_context);
        }
        public List<ListSection> Sections { get { return _sections; } set { _sections = value; } }
        public void AddSection(ListSection section) { _sections.Add(section); }
        public void AddSection(String caption, String columnHeader1, String columnHeader2, String columnHeader3, BaseAdapter adapter)
        {
            _sections.Add(new ListSection(caption, columnHeader1, columnHeader2, columnHeader3, adapter));
        }
        public override ListSection this[int index] { get { return _sections[index]; } }
        public override int Count
        {
            get
            {
                int count = 0;
                foreach (ListSection s in _sections) count += s.Adapter.Count + 1;
                return count;
            }
        }
        public override int ViewTypeCount
        {
            get
            {
                int viewTypeCount = 1;
                foreach (ListSection s in _sections) viewTypeCount += s.Adapter.ViewTypeCount;
                return viewTypeCount;
            }
        }
        public override long GetItemId(int position) { return position; }
        public override bool AreAllItemsEnabled() { return false; }
        public override int GetItemViewType(int position)
        {
            int typeOffset = TYPE_SECTION_HEADER + 1;
            foreach (ListSection s in _sections)
            {
                if (position == 0) return TYPE_SECTION_HEADER;
                int size = s.Adapter.Count + 1;
                if (position < size) return (typeOffset + s.Adapter.GetItemViewType(position - 1));
                position -= size;
                typeOffset += s.Adapter.ViewTypeCount;
            }
            return -1;
        }
        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            View view = convertView;
            foreach (ListSection s in _sections)
            {
                if (position == 0)
                {
                    if (view == null || !(view is LinearLayout)) view = _inflater.Inflate(Resource.Layout.ListSeparator, parent, false);
                    TextView caption = view.FindViewById<TextView>(Resource.Id.caption);
                    caption.Text = s.Caption;
                    TextView columnHeader1 = view.FindViewById<TextView>(Resource.Id.columnHeader1);
                    columnHeader1.Text = s.ColumnHeader1;
                    TextView columnHeader2 = view.FindViewById<TextView>(Resource.Id.columnHeader2);
                    columnHeader2.Text = s.ColumnHeader2;
                    TextView columnHeader3 = view.FindViewById<TextView>(Resource.Id.columnHeader3);
                    columnHeader3.Text = s.ColumnHeader3;
                    return view;
                }
                int size = s.Adapter.Count + 1;
                if (position < size) return s.Adapter.GetView(position - 1, convertView, parent);
                position -= size;
            }
            return null;
        }
        public override Java.Lang.Object GetItem(int position)
        {
            foreach (ListSection s in _sections)
            {
                if (position == 0) return null;
                int size = s.Adapter.Count + 1;
                if (position < size) return s.Adapter.GetItem(position - 1);
                position -= size;
            }
            return null;
        }
    }

    public class ListSection
    {
        private String _caption, _columnHeader1, _columnHeader2, _columnHeader3;
        BaseAdapter _adapter;
        public ListSection(String caption, String columnHeader1, String columnHeader2, String columnHeader3, BaseAdapter adapter)
        {
            _caption = caption;
            _columnHeader1 = columnHeader1;
            _columnHeader2 = columnHeader2;
            _columnHeader3 = columnHeader3;
            _adapter = adapter;
        }
        public String Caption { get { return _caption; } set { _caption = value; } }
        public String ColumnHeader1 { get { return _columnHeader1; } set { _columnHeader1 = value; } }
        public String ColumnHeader2 { get { return _columnHeader2; } set { _columnHeader2 = value; } }
        public String ColumnHeader3 { get { return _columnHeader3; } set { _columnHeader3 = value; } }
        public BaseAdapter Adapter { get { return _adapter; } set { _adapter = value; } }
    }
}