如何使用從多個表中的數據行LINQ到實體

Question

我使用的DbContext代碼搶先拿到這個條件下的類（表）的查詢的基礎得到：

造物主= NULL & & ArticleAttached！ ！= NULL & & IsCancelled

var ArticleStudentLiked = dbcontext.LearningActivites 
    .Where(la => la.Creator != null && la.ArticleAttached != null && !la.IsCancelled) 
    .Sum(la => la.ArticleAttached.StudentsLiked.Count); 

    var NewsArticleComment = dbcontext.LearningActivites 
    .Where(la => la.Creator != null && la.ArticleAttached != null && !la.IsCancelled) 
    .Sum(la => la.ArticleAttached.Comments.Count); 

以下方法僅返回計數：

• ArticleStudentLiked
• ArticleComment

我需要從查詢記錄的行成一個單一的集合，我可以通過查看由線顯示線

這樣的：

文章標題，評論數量，評論數量

如何使用LinQ獲取這些：文章標題，編號。像，評論的

Classes: 


public class LearningActivity 
{ 
    public virtual ArticleCreator Creator { get; set; }   
    public virtual ArticleCreator EditedBy { get; set; }   
    public virtual Teacher CreatedByTeacher { get; set; } 
    public virtual Article ArticleAttached { get; set; } 
    public virtual Article ArticleAttachedByOther { get; set; } 
    public bool IsCancelled { get; set; } 
} 


public class Article 
{ 
    public string ArticleTitle {get;set;} 
    public virtual IList<Teacher> TeachersLiked { get; set; } 
    public virtual IList<Student> StudentsLiked { get; set; } 
    public virtual IList<ArticleComment> Comments { get; set; } 
} 


public class Student 
{ 
    public virtual IList<ArticleCommentStudent> Comments { get; set; } 
} 

感謝

號

Answer 1

你可以試試這個

// LikeCount is total of Teacher and Student Likes 
// and where clause can be added before Select 
var result = dbcontext.Classes 
      .Select(x=> new { ArticleTitle = x.ArticleTitle, 
           LikeCount = x.TeachersLiked.Count() + x.StudentsLiked.Count(), 
           CommentCount= x.Comments.Count }).First();