无论如何要选择最近的帖子和最近的帖子

Question

我正在使用LINQ并将此命令链接到模型中。

model.LatestPosts = db.TPGForums.SelectMany(m => m.TPGForumTopics)
                                .SelectMany(m => m.TPGForumPosts)
                                .SelectMany(m => m.TPGForumThreads)
                                .OrderByDescending(m => m.dateCreated)
                                .Take(5);

但这只会让我回到主题。我需要TPGForumPosts和TPGForumThreads中最近5个最近的项目。我如何返回最近的5个帖子/帖子而不仅仅是最新的帖子？

Answer 1

嵌套SelectMany来电，而不是将它们链接起来：

var query = db.TPGForums
    .SelectMany(forum => forum.TPGForumTopics
        .SelectMany(topic => topic.TPGForumPosts
            .SelectMany(post => post.TPGForumThreads
                .Select(thread => new { forum, topic, post, thread }))))
    .OrderByDescending(m => m.thread.dateCreated)
    .Take(5);