從父對象集合中檢索所有子代

Question

我有一個名爲blog的對象和一個名爲article的對象。博客裏面有很多文章。我選擇我的博客是這樣的：

Dim blogs = db.Blogs.Where(Function(b) b.CompanyId = companyId) 

如何獲取所選博客中的所有文章？

我想顯示所選博客列表中相應的文章：

Dim articles = ' How do I get all the articles inside of the blogs found? 
Return View(articles.ToList()) 

我的博客實體如下：

Imports System.Data.Entity 
Imports System.ComponentModel.DataAnnotations 

Public Class Blog 

    Public Property BlogId() As Integer 
    Public Property CompanyId() As Integer 
    Public Property Name() As String 
    Public Property Description() As String 
    Public Property DateCreated As Date 

    Public Overridable Property Articles() As ICollection(Of Article) 

    Public Overridable Property Company() As Company 

End Class 

Public Class BlogDbContext 

    Inherits DbContext 
    Public Property Blogs As DbSet(Of Blog) 
    Public Property Companies As DbSet(Of Company) 
End Class 

Answer 1

Dim articles = blogs.SelectMany(Function(b) b.Articles)