我基本上有一个帖子库，应该返回所有属于它的图库项目。如果没有属于该帖子的画廊，它仍应返回按帖子ID区分的帖子
public List<PostLocalizedOutput> GetAllPostsWithCategories(string culture, bool? isPublished)
{
var query =
from p in Context.Posts
join pl in Context.PostsLocalized on p.Id equals pl.PostId
from c in p.Categories
join cl in Context.CategoriesLocalized on c.Id equals cl.CategoryId
from g in p.Galleries.DefaultIfEmpty()
join gi in Context.GalleryItems on g.Id equals gi.GalleryId
where
pl.Culture == culture &&
cl.Culture == culture
select new PostLocalizedOutput
{
PostId = pl.PostId,
CategoryId = cl.CategoryId,
Title = pl.Title,
FormattedCategoryName = cl.FormattedCategoryName,
PostContent = pl.PostContent,
PostType = pl.Post.PostType,
IOrder = pl.Post.IOrder,
Tags = pl.Tags,
PublishDate = pl.Post.PublishDate,
ViewCount = pl.Post.ViewCount,
ShowInHomePageSlider = pl.Post.ShowInHomePageSlider,
AllowComments = pl.Post.AllowComments,
Image = pl.Post.Image,
IsArchived = pl.Post.IsArchived,
IsDraft = pl.Post.IsDraft,
IsPublished = pl.Post.IsPublished,
GalleryItems = new GalleryItemOutput
{
FileName = gi.FileName,
GalleryId = gi.GalleryId,
Id = gi.Id,
Notes = gi.Notes,
Title = gi.Title
} (around here i feel like i should foreach something or what?)
};
return query.OrderBy(x => x.IOrder).ThenBy(x => x.PublishDate).DistinctBy(x => x.PostId).ToList();
}
这是我的postlocalized输出
public class PostLocalizedOutput : IOutputDto
{
public int PostId { get; set; }
public int CategoryId { get; set; }
public bool IsPublished { get; set; }
...
public List<GalleryItemOutput> GalleryItems { get; set; }
}
GalleryItemOutput应该是列表，因为我想要发布的所有画廊。但是，当我将其定义为存储库中的列表时，我无法设置帖子的GalleryItem的每个字段。这段代码现在返回了四行，因为我有该帖子的四个图库项目，每个项目都有相同的postId。我不要那个。即使帖子中没有任何图库项目，DefaultIfEmpty也不起作用，我仍然应该能够在没有图库项目的情况下获得该帖子。
有什么办法吗？
感谢您的所有建议。
这应该可以帮助您入门。不知道它是否可以编译，请解释为伪代码。看起来您的顶级范围变量是PostsLocalized而不是Posts。此代码假定/使用了可能在您的EDM类中设置的导航属性。我在这里过度使用了let关键字只是为了让您更清楚。在select new子句中，您可以将p1.Post ....更改为p。我离开了他们进行尽可能少的编辑。
var query =
from pl in Context.PostsLocalized
where pl.Culture == culture
let p = p1.Post
let categories = p.Categories
let localizedCategories = categories.SelectMany(cat => cat.CategoriesLocalized).Where(cl => cl.Culture == culture)
let galleries = p.Galleries
let galleryItems = galleries.SelectMany(gal => gal.GalleryItems)
let cl = localizedCategories.FirstOrDefault() // only one or zero of these i assume?
select new PostLocalizedOutput
{
PostId = p1.PostId,
CategoryId = cl.CategoryId,
Title = pl.Title,
FormattedCategoryName = cl.FormattedCategoryName,
PostContent = pl.PostContent,
PostType = pl.Post.PostType,
IOrder = pl.Post.IOrder,
Tags = pl.Tags,
PublishDate = pl.Post.PublishDate,
ViewCount = pl.Post.ViewCount,
ShowInHomePageSlider = pl.Post.ShowInHomePageSlider,
AllowComments = pl.Post.AllowComments,
Image = pl.Post.Image,
IsArchived = pl.Post.IsArchived,
IsDraft = pl.Post.IsDraft,
IsPublished = pl.Post.IsPublished,
GalleryItems = galleryItems.Select(gi => new GalleryItemOutput
{
FileName = gi.FileName,
GalleryId = gi.GalleryId,
Id = gi.Id,
Notes = gi.Notes,
Title = gi.Title
})
// might need a .ToList() here on those GalleryItems
(around here i feel like i should foreach something or what?)
};
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