如何從List C＃中獲取對象？

Question

我有2種型號 - 帖子，評論

在型號後我做：

public List<Comment> Comments { get; set; } 

後，我創建的sampleData模型初始化 和意見我得到index.cshtml，我可以讓我的第一篇文章 但是當我試圖讓Post.Comments我得到空，並初始化所有工作以及..

SampleData.cs：

using System; 
    using System.Linq; 
    using Microsoft.Data.Entity; 
    using Microsoft.Extensions.DependencyInjection; 
    using System.Collections.Generic; 

    namespace WebShauli.Models 
    { 
     public class SampleData 
     { 
      public static void Initialize(IServiceProvider serviceProvider) 
      { 
      var context = serviceProvider.GetService<ApplicationDbContext>(); 
      { 
       context.Database.Migrate(); 
       if (!context.Comment.Any()) 
       { 

       var Post1 = context.Post.Add(
        new Post { Author = "Elad", AuthorURL = "http://www.momlazim.com", Content = "Hello everybody , this is my first post", Date = new DateTime(2016, 05, 09), Comments = context.Comment.ToList<Comment>(), Title = "First post", Image = "blabla", Video = "blabla2" }).Entity; 
       Post1.Comments = new List<Comment>(); 
       context.Comment.AddRange(
        new Comment() 
        { 
         Post = Post1, 
         Title = "Comment 3", 
         Content = "Hello , this is the first comment", 
         WriterComment = "Eli", 
         WriterURL = "http://www.ynet.co.il" 
        }, 
        new Comment() 
        { 
         Post = Post1, 
         Title = "Comment 2", 
         Content = "Hello , this is the first comment", 
         WriterComment = "Efffli", 
         WriterURL = "http://www.ynet.co.il" 
        }, 
        new Comment() 
        { 
         Post = Post1, 
         Title = "Comment 1", 
         Content = "Hello , this is the first comment", 
         WriterComment = "Efffli", 
         WriterURL = "http://www.ynet.co.il" 
        } 
       ); 
       context.SaveChanges(); 
      } 
     } 
    } 
    } 
} 

index.cs：

@model IEnumerable<WebShauli.Models.Post> 
@{ 
ViewData["Title"] = "Blog"; 
} 

<form action="#"> 
<h3>Search post</h3> 
Date between: <input id="inputDateStart" type="date" name="startDate"> to  <input id="inputDateEnd" type="date" name="endDate"> 
<br /> 
Author name: <input id="inputAuthor" type="text" name="Full name"> 
<br /> 
E-mail: <input id="inputEmail" type="email" name="email"> 
<br /> 
Words from posts: <input type="text" name="wordFromPosts"> 
<br /> 
Minimum replys for post: <input type="range" name="points" min="0" max="10"> 
<br /> 
<input type="submit" value="Search"> 
</form> 

@foreach (var item in Model) 

{ 
<section> 

    <article class="blogPost"> 
     <header> 
      <h2>@Html.DisplayFor(Model => item.Title)</h2> 
      <p>Posted on <time datetime="@Html.DisplayFor(Model => item.Date)">@Html.DisplayFor(Model => item.Date)</time> by <a href="@Html.DisplayFor(Model => item.AuthorURL)">@Html.DisplayFor(Model => item.Author)</a> - <a href="@Html.DisplayFor(Model => item.PostID)">@Html.DisplayFor(Model => item.Comments.Count) comments</a></p> 
     </header> 
     <div> 
      <p>@Html.DisplayFor(Model => item.Content)</p> 

      <img src="@Html.DisplayFor(Model => item.Image)" alt="picture" /> 
      <p></p> 
      <video controls="controls"> 
       <source src="@Html.DisplayFor(Model => item.Video)" type="video/mp4" /> 
       Your browser does not support the video tag. 
      </video> 
      <p></p> 
     </div> 
    </article> 
</section> 
<section id="@Html.DisplayFor(Model => item.PostID)"> 
    <h3>Comments</h3> 
    @foreach (var itemC in item.Comments) 
    { 
     <article> 
      <header> 
       <a href="@Html.DisplayFor(Model => itemC.WriterURL)">@Html.DisplayFor(Model => itemC.WriterComment)</a> 
      </header> 
      <p>@Html.DisplayFor(Model => itemC.Content)</p> 
     </article> 
    } 
</section> 
@using (Html.BeginForm("AddComment", "Blog")) 
{ 
    @Html.AntiForgeryToken() 
    <h3>Post a comment</h3> 
    @Html.Hidden("PostID",item.PostID) 
    <p> 
     <label for="Name">Name</label> 
     @Html.TextBox("WriterComment") 
    </p> 
    <p> 
     <label for="Website">Website</label> 
     @Html.TextBox("WriterURL") 
    </p> 
    <p> 
     <label for="Title">Title</label> 
     @Html.TextBox("Title") 
    </p> 
    <p> 
     <label for="Comment">Comment</label> 
     @Html.TextBox("Content") 
    </p> 
    <p><input type="submit" value="Post comment" /></p> 
    } 
} 

請幫幫忙！

Answer 1

更改此

public List<Comment> Comments { get; set; } 

這個

public virtual List<Comment> Comments { get; set; }