IA.Service/Repository.cs

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using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.Validation;
using System.Linq;
using System.Reflection;
using IA.Interface;

namespace IA.Service
{
    public class Repository<T> : IRepository<T> where T : class
    {
        #region Fields

        private readonly DbContext _context;
        private IDbSet<T> _entities;

        #endregion

        #region Ctor

        /// <summary>
        /// Ctor
        /// </summary>
        /// <param name="context">Object context</param>
        public Repository(DbContext context)
        {
            _context = context;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Get entity by identifier
        /// </summary>
        /// <param name="id">Identifier</param>
        /// <returns>Entity</returns>
        public virtual T GetById(object id)
        {
            //see some suggested performance optimization (not tested)
            //http://stackoverflow.com/questions/11686225/dbset-find-method-ridiculously-slow-compared-to-singleordefault-on-id/11688189#comment34876113_11688189
            return Entities.Find(id);
        }

        /// <summary>
        /// Insert entity
        /// </summary>
        /// <param name="entity">Entity</param>
        public virtual T Insert(T entity)
        {
            try
            {
                if (entity == null)
                    throw new ArgumentNullException("entity");

                Entities.Add(entity);

                _context.SaveChanges();