/// <summary>
/// 判断传入的page参数是否合法
/// </summary>
/// <param name="page"></param>
/// <returns></returns>
public static PageArgument IsTrue(this PageArgument page)
{
if (page == null)
{
throw new ArgumentNullException(nameof(page));
}
if (page.PageIndex <= 0)
{
throw new ArgumentOutOfRangeException(nameof(page), "PageIndex必须是大于0的正整数");
}
if (page.PageSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(page), "PageSize必须是大于0的正整数");
}
return(page);
}
/// <summary>
/// 获取商品列表
/// </summary>
/// <param name="page">分页对象</param>
/// <returns></returns>
public IEnumerable <CommodityListDto> CommodityList(PageArgument page)
{
//判断分页传参
var realPage = page.IsTrue();
//分页操作
var commodityList = _db.CommodityRepos.Skip((realPage.PageIndex - 1) * realPage.PageSize).Take(realPage.PageSize).Select(s =>
new CommodityListDto
{
Number = s.Number,
Name = s.Name,
Price = s.Price,
Status = Enum.GetName(typeof(CommodityStatus), s.StatusId),
DbCreateAt = s.CreateAt,
DbUpdateAt = s.LastEditAt
}).OrderByDescending(s => s.DbUpdateAt);
return(commodityList);
}
