使用EF框架的增删改查和分页的公共类

public class BaseRepository<T> where T : class    {        //实例化EF框架        DataModelContainer db = new DataModelContainer();        //添加        public T AddEntities(T entity)        {            db.Entry<T>(entity).State = EntityState.Added;            db.SaveChanges();            return entity;        }        //修改        public bool UpdateEntities(T entity)        {            db.Set<T>().Attach(entity);            db.Entry<T>(entity).State = EntityState.Modified;            return db.SaveChanges() > 0;        }        //删除        public bool DeleteEntities(T entity)        {            db.Set<T>().Attach(entity);            db.Entry<T>(entity).State = EntityState.Deleted;            return db.SaveChanges() > 0;        }        //查询        public IQueryable<T> LoadEntities(Func<T, bool> wherelambda)        {            return db.Set<T>().Where<T>(wherelambda).AsQueryable();        }        //分页        public IQueryable<T> LoadPagerEntities<S>(int pageSize, int pageIndex, out int total,            Func<T, bool> whereLambda, bool isAsc, Func<T, S> orderByLambda)        {            var tempData = db.Set<T>().Where<T>(whereLambda);            total = tempData.Count();            //排序获取当前页的数据            if (isAsc)            {                tempData = tempData.OrderBy<T, S>(orderByLambda).                      Skip<T>(pageSize * (pageIndex - 1)).                      Take<T>(pageSize).AsQueryable();            }            else            {                tempData = tempData.OrderByDescending<T, S>(orderByLambda).                     Skip<T>(pageSize * (pageIndex - 1)).                     Take<T>(pageSize).AsQueryable();            }            return tempData.AsQueryable();        }    }