写一个system.data.entity的simpledatarepo，实现crudq这些功能，不需要引入entityframework,直接可以使用，用到objectset

note:you can delete reference of entityframework when using this classes.it`s just a simple repohelper.the code below can also include a getpagedlist method when paging.

have fun,it`s simple,just create edmx file from database.all one sentence.but when using iqueryable or transaction,you need to use context factory and develop your own methods.

i am using it now.very simple.just like a static modelhelper orm.

1.simpledaterepo:

/*
 * author:iGo
 * for-free
 * last-update:2015年7月7日
 * auth:mit
 * hope it will be useful to you
 * */
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Linq.Expressions;

namespace DBContext {
    /// <summary>
    /// static data repo,you donot need to reference entity framework
    /// </summary>
    public class SimpleDataRepo {
        public static void Add<T>(T model) {
            if (model == null) return;
            using (var context = DataContext.Context) {
                context.AddObject(typeof(T).Name, model);
                context.SaveChanges();
            }
        }

        public static void Edit<T>(T model) where T : class {
            if (model == null) return;
            using (var context = DataContext.Context) {
                context.AddObject(model.GetType().Name, model);
                context.ObjectStateManager.ChangeObjectState(model, EntityState.Modified);
                context.SaveChanges();
            }
        }
        public static void EditCommand<T>(String setCondition, String whereClause) {
            if (String.IsNullOrEmpty(setCondition)) return;
            using (var context = DataContext.Context) {
                context.ExecuteStoreCommand(String.Format("update {0} set {1} where {2}", typeof(T).Name, setCondition, whereClause));
            }
        }

        public static void Delete<T>(T model) where T : class {
            if (model == null) return;
            using (var context = DataContext.Context) {
                context.AddObject(model.GetType().Name, model);
                context.ObjectStateManager.ChangeObjectState(model, EntityState.Deleted);
                context.SaveChanges();
            }

        }

        [NotUsed("not used due to linq function unsupported!")]
        private static int GetPropertyIdValueFromModel<T>(T model) {
            return (int)model.GetType().GetProperty("id").GetValue(model, null);
        }

        public static IList<T> GetAll<T>(Expression<Func<T, bool>> condition = null) {
            using (var context = DataContext.Context) {
                var query = context.GetType().GetProperty(typeof(T).Name).GetValue(context, null) as IQueryable<T>;
                return query != null ? query.ToList() : null;
            }
        }

        public static IList<T> GetAllCommand<T>(String whereClause = "") {
            using (var context = DataContext.Context) {
                return context.ExecuteStoreQuery<T>(String.Format("select * from {0} {1}", typeof(T).Name,
                     String.IsNullOrEmpty(whereClause) ? "" : (" where " + whereClause))).ToList();
            }
        }

        /// <summary>
        /// Get first model that satisfies the specified condition,GetById can be implied here,ie:a=>a.Id=5
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="condition"></param>
        /// <returns></returns>
        public static T QueryFirst<T>(Expression<Func<T, bool>> condition) {
            using (var context = DataContext.Context) {
                var query = context.GetType().GetProperty(typeof(T).Name).GetValue(context, null) as IQueryable<T>;
                if (query == null) return default(T);
                return query.FirstOrDefault(condition);
            }
        }

        public static T QueryFirstCommand<T>(String condition = "") {
            using (var context = DataContext.Context) {
                return
                    context.ExecuteStoreQuery<T>(String.Format("select top 1 * from {0} {1}", typeof(T).Name,
                        String.IsNullOrEmpty(condition) ? "" : (" where " + condition))).FirstOrDefault();
            }
        }

        public static IList<T> QuerySort<T, TS>(Expression<Func<T, bool>> condition, Expression<Func<T, TS>> sortExpression = null, bool isDecending = false) {
            using (var context = DataContext.Context) {
                var query = context.GetType().GetProperty(typeof(T).Name).GetValue(context, null) as IQueryable<T>;
                if (query == null) return null;
                query = query.Where(condition).Where(condition);
                if (sortExpression != null)
                    query = isDecending ? query.OrderByDescending(sortExpression) : query.OrderBy(sortExpression);
                return query.ToList();
            }
        }

        public static void DeleteByIds<T>(String ids) {
            if (String.IsNullOrEmpty(ids)) throw new ArgumentException("ids cannot be null or empty!");
            using (var context = DataContext.Context) {
                context.ExecuteStoreCommand(String.Format("delete from {0} where id in ({1})", typeof(T).Name, ids));
                context.SaveChanges();
            }
        }

        #region web paging field

        //protected virtual IPagedList<T> GetTPagedList<T, TS>(Expression<Func<T, bool>> filter = null, Expression<Func<T, TS>> orderby = null, bool isDecending = false) where T : new() {
        //    IPagedList<T> list;
        //    using (var context = DataContext.Context) {
        //        var pageIndex = Request["pageNum"] ?? "1";
        //        var pageSize = Request["numPerPage"] ?? "15";

        //        Expression<Func<T, bool>> condition = a => true;
        //        if (filter != null) condition = condition.And(filter);
        //        var b = context.GetType().GetProperty(typeof(T).Name).GetValue(context, null) as IQueryable<T>;
        //        if (b == null) return null;
        //        b = b.Where(condition);
        //        if (orderby != null)
        //            b = !isDecending ? b.OrderBy(orderby) : b.OrderByDescending(orderby);
        //        list = b.ToPagedList(int.Parse(pageIndex), int.Parse(pageSize));
        //        //b.Skip(int.Parse(pageSize)*(int.Parse(pageIndex) - 1)).Take(int.Parse(pageSize)).ToList();
        //    }
        //    return list;
        //}
        #endregion

    }
}

 2.context factory:

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

namespace DBContext {
    public partial class DataContext  {
        public static GpsDataContext Context {
            get {
                return new GpsDataContext();
            }
        }
    }
}