FackIObjectSet.cs

using System;
using System.Collections.Generic;
using System.Data.Objects;
using System.Linq;

namespace TestCoreService
{
    public class FackIObjectSet<T> : IObjectSet<T>
    where T : class
    {
        private HashSet<T> _data;
        private IQueryable _query;

        public FackIObjectSet()
        {
            _data = new HashSet<T>();
            _query = _data.AsQueryable();
        }

        public void AddObject(T item)
        {
            _data.Add(item);
        }

        public void DeleteObject(T item)
        {
            _data.Remove(item);
        }

        public void Add(T item)
        {
            _data.Add(item);
        }

        public void Remove(T item)
        {
            _data.Remove(item);
        }

        public void Attach(T item)
        {
            _data.Add(item);
        }

        public void Detach(T item)
        {
            _data.Remove(item);
        }

        Type IQueryable.ElementType
        {
            get { return _query.ElementType; }
        }

        System.Linq.Expressions.Expression IQueryable.Expression
        {
            get { return _query.Expression; }
        }

        IQueryProvider IQueryable.Provider
        {
            get { return _query.Provider; }
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return _data.GetEnumerator();
        }

        IEnumerator<T> IEnumerable<T>.GetEnumerator()
        {
            return _data.GetEnumerator();
        }
    }
}