Question

我的查询似乎并不尊重我的order by子句，

有人可以帮我解决这个问题吗？

   Dim Result = ((From z As lnkCategorySubCategory In dbContext.lnkCategorySubCategories
                   Join x As SubItem In dbContext.SubItems On x.Id Equals z.CategoryId
                   Join p As lnkItemsCategory In dbContext.lnkItemsCategories On z.CategoryId Equals p.ItemCategoryId
                   Order By z.IsHeadColumn Descending
                   Order By z.Order Descending
                   Select x.Name)).Distinct

Answer 1

如果没有更多信息，我无法告诉您导致问题的原因。但是，如果我采取疯狂的猜测，我建议你改变这个：

Order By z.IsHeadColumn Descending
Order By z.Order Descending

对此：

Order By z.IsHeadColumn, z.Order descending

Answer 2

我觉得orderby z.IsHeadColumn descending, z.Order descending应该有效

Answer 3

这里的问题是我没有选择我选择订购的列，所以我需要写更多这样的东西来解决这个问题

  Dim Result = ((From z As lnkCategorySubCategory In dbContext.lnkCategorySubCategories
                       Join x As SubItem In dbContext.SubItems On x.Id Equals z.CategoryId
                       Join h As lnkSubItemImageLink In dbContext.lnkSubItemImageLinks On x.Id Equals h.SubItemId
                       Join p As lnkItemsCategory In dbContext.lnkItemsCategories On z.CategoryId Equals p.ItemCategoryId
                       Select x.Name, h.ImageLink, z.IsHeadColumn, z.Order)).Distinct.OrderByDescending(
                       Function(u) u.IsHeadColumn).ThenBy(Function(j) j.Order).ToDictionary(Function(x) x.Name, Function(h) h.ImageLink)

Linq加入明显和顺序

3 个答案: