VS2012里面使用EF框架的增删改查和分页的方法

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;
        }

//修改
        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();
        }
    }