如何使用 EF 按年而不是按月分组？

Question

我想先按年对帖子进行分组，然后按月对存档小部件进行分组，这样我得到的结果如下：

2012
  January
  Febuary
  March
  Etc

2013
  January
  Febuary
  March
  Etc

这是我目前拥有的：

  Public Function SelectYearandMonth() As IEnumerable(Of ArchiveMonthYearViewModel)
        Dim posts
        posts = _postRepository.SelectAll.Where(Function(p)
        p.PostIsPublished).GroupBy(Function(p) New ArchiveMonthYearViewModel()
        With {.Year = p.PostDateCreated.Year, .Month = 
        .PostDateCreated.Month}).Select(Function(a) a.Key).ToList
  End Sub

我需要两次选择吗？首先是年份，然后是内部选择？

Answer 1

已解决：

Public Function SelectYearandMonth() As IEnumerable(Of ArchiveMonthYearViewModel)
    Dim data = db.be_Posts.Where(Function(p) p.IsPublished = True).GroupBy(Function(a) _
    New With {.Month = a.DateCreated.Value.Month, .Year = a.DateCreated.Value.Year}).Select(Function(x) _
    New ArchiveMonthYearViewModel With {.Month = x.Key.Month, .Year = x.Key.Year, 
   .Total = x.Count}).OrderByDescending(Function(x) x.Year).ThenByDescending(Function(x)
    (x.Month)).ToList
    Return data
        End Function