如何检索特定帖子的所有评论？

Question

在尝试获取特定帖子的 cmets 时遇到了一些障碍。使用 MVC 3 和 VBNET。帖子 url 看起来像 /Blog/Post/1。我可以毫无问题地显示帖子，但需要从 Comments 表中获取 PostId=1 的 cmets。我尝试了一个 Linq 内连接语句

Dim results = From P In _rdsqlconn.Posts Where P.PostId = id Join c In _rdsqlconn.Comments On P.PostId Equals c.PostId Select P



Public Class RDSQLConn
        Inherits DbContext

        Public Sub New()

        End Sub


        Property Posts As DbSet(Of Post)
        Property Categories As DbSet(Of Category)
        Property Comments As DbSet(Of Comment)

    End Class

但这会引发：

`Unable to cast object of type 'System.Data.Entity.Infrastructure.DbQuery`1[RiderDesignMvcBlog.Core.Entities.Post]' to type 'RiderDesignMvcBlog.Core.Entities.Post'.`

但是，如下所示的 SQL 查询可以正常工作。我可以将这个 sql 语句传递给我的 EF 吗？

Select * From Posts  INNER JOIN Comments on dbo.Posts.PostId = Comments.PostId where dbo.Posts.PostId = 1 

Answer 1

Dim results = From P In _rdsqlconn.Posts Join c In _rdsqlconn.Comments On P.PostId Equals c.PostId 
Where P.PostId = id 
Select P