Question

我是asp网络Mvc的新手，我正在尝试在mvc 4中创建一个简单的论坛。我可以创建并列出线程和帖子，但我似乎无法弄清楚如何在现有的帖子中添加新帖子线。换句话说，我希望能够将多个帖子连接到特定的ThreadId。

那么实现这一目标的最佳方法是什么？我应该将@ActionLink中的值传递给PostController Create method ThreadId值吗？或者我可以在PostController中以某种方式处理这个问题吗？任何代码示例或提示都非常感谢。

我有以下课程：

public class Thread
{
    public int ThreadId { get; set; }
    public DateTime ? PostDate { get; set; }
    public string ThreadText { get; set; }
    public string ThreadTitle { get; set; }
    public virtual UserProfile UserProfile { get; set; }

    public virtual ICollection<Post> Posts { get; set; }
}    

public class Post
{        
    public int PostId { get; set; }
    public string PostTitle { get; set;}
    public string PostText { get; set; }
    public DateTime ? PostDate { get; set; }
    public virtual UserProfile UserProfile { get; set; }

    public virtual Thread Thread { get; set; }
    [System.ComponentModel.DataAnnotations.Schema.ForeignKey("Thread")]
    public int ThreadId { get; set; }        
}

Answer 1

有几种方法可以达到你想要的效果。在这里，我向您介绍使用强类型视图的方法。

我假设您有一个名为 ViewThreadDetail 的视图，其中包含属于给定 threadId 的帖子列表，您还可以在其中提交新帖子。

ThreadController.cs：

public class ThreadDetailViewModel
{
    public Thread Thread { get; set; }

    public Post NewPost { get; set; }
}

public ActionResult ViewThreadDetail(int id)
{
    // load thread from database
    var thread = new Thread(){ ThreadId = id, ThreadTitle = "ASP.Net MVC 4", Posts = new List<Post>()};
    // assign ThreadId of New Post
    var newPost = new Post() { PostTitle = "", PostText = "", ThreadId = id };

    return View(new ThreadDetailViewModel() { Thread = thread, NewPost = newPost });
}

ViewThreadDetail.cshtml

@model MvcApplication1.Models.ThreadDetailViewModel

@{
    ViewBag.Title = "ViewThreadDetail";
}

<h2>ViewThreadDetail</h2>

<p>List of Posts:</p>
@foreach (var post in Model.Thread.Posts)
{
    <div>@post.PostTitle</div>
}

<p>Add a Post:</p>
@Html.Action("NewPost", "Post", Model.NewPost)

您需要一个名为NewPost的PartialView来提交新帖子：

@model MvcApplication1.Models.Post

@using(Html.BeginForm("Add", "Post"))
{
    @Html.LabelFor(a=>a.PostTitle);
    @Html.TextBoxFor(a => a.PostTitle);

    @Html.LabelFor(a => a.PostText);
    @Html.TextBoxFor(a => a.PostText);

    //A hidden field to store ThreadId
    @Html.HiddenFor(a => a.ThreadId);

    <button>Submit</button>
}

PostController.cs

public ActionResult NewPost(Post newPost)
{
     return PartialView(newPost);
}

public ActionResult Add(Post newPost)
{
     // add new post to database and redirect to thread detail page
     return RedirectToAction("ViewThreadDetail", "Thread", new { id = newPost.ThreadId });
}

Asp net MVC 4，创建一个简单的论坛

1 个答案: