Entity Framework 第六篇 分页查询

目前分页支持单表

public IList<TEntity> GetPaged<TEntity>(out int total, Expression<Func<TEntity, bool>> filter = null, Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null, int index = 1, int size = 20) where TEntity : class
        {
            int skipCount = (index - 1) * size;
            var _reset = Get(filter, orderBy);
            total = _reset.Count();
            _reset = skipCount > 0 ? _reset.Skip(skipCount).Take(size) : _reset.Take(size);
            return _reset.ToList();
        }

        public IQueryable<TEntity> Get<TEntity>(Expression<Func<TEntity, bool>> filter = null, Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null) where TEntity : class
        {
            IQueryable<TEntity> query = dbContext.Set<TEntity>();
            if (filter != null)
            {
                query = query.Where(filter);
            }
            if (orderBy != null)
            {
                return orderBy(query).AsQueryable();
            }
            else
            {
                return query.AsQueryable();
            }
        }

使用

 int count;
            var a = respository.GetPaged<S_Users>(out count, m => m.LoginName.Contains("a"), q => q.OrderBy(m => m.LastDate),1, 20);

是不是很方便?

如何多个排序条件？

var a = respository.GetPaged<S_Users>(out count, m => m.LoginName.Contains("a"), q => q.OrderBy(m => m.LastDate).ThenByDescending(m=>m.LoginNum),1, 20);