我的项目有问题我是MVC的新手,所以请帮我解决。我有问题在相关的帖子下显示评论,就像我们在脸书中发帖,我们在帖子下面发表评论并显示,我已经显示并列出了所有帖子,在此我已经显示了评论字段,我只是想知道如何显示相关评论, 查看
@foreach (Post item in Model.posts)
{
foreach(Comment c in item.comments)
{
<div>
<p>
@item.Body
</p>
<p>@item.timeDate</p>
<p>@c.Body</p>
</div>
using (Html.BeginForm("CreateComment", "Posts", FormMethod.Post))
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<fieldset>
<legend>Comment</legend>
<div class="editor-label">
@Html.LabelFor(model => model.comment.Name)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.comment.Name)
@Html.ValidationMessageFor(model => model.comment.Name)
</div>
<div class="editor-label">
@Html.LabelFor(model => model.comment.Email)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.comment.Email)
@Html.ValidationMessageFor(model => model.comment.Email)
</div>
<div class="editor-label">
@Html.LabelFor(model => model.comment.Body)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.comment.Body)
@Html.ValidationMessageFor(model => model.comment.Body)
</div>
<div class="editor-label">
@Html.LabelFor(model => model.comment.dateTime)
</div>
<div class="editor-field">
@Html.TextBoxFor(model => model.comment.dateTime, new { id = "datepicker", @Value = @DateTime.Now })
@Html.ValidationMessageFor(model => model.post.timeDate)
</div>
<div class="editor-field">
<input type ="text" hidden="hidden" value="@item.Id" name="txtpostId"/>
@Html.ValidationMessageFor(model => model.comment.PostId)
</div>
<p>
<input type="submit" value="Create"/>
</p>
</fieldset>
}
}
}
控制器
public ActionResult Index()
{
objVmPost.comment = new Comment();
objVmPost.post = new Post();
List<Post> mylist = db.Posts.Include(post => post.Comments).ToList();
objVmPost.posts = mylist;
return View("Index",objVmPost);
}
[HttpPost]
public ActionResult CreateComment(VmPost objVmpost)
{
objVmpost.comment.PostId = Convert.ToInt32(Request.Form["txtpostId"]);
db.Comments.Add(objVmpost.comment);
db.SaveChanges();
List<Post> mylist = objPostDb.GetAll().ToList();
objVmpost.posts = mylist;
return View("index", objVmpost);
}
模型
public partial class Comment
{
public int Id { get; set; }
public string Name { get; set; }
public string Email { get; set; }
public string Body { get; set; }
public System.DateTime dateTime { get; set; }
public int PostId { get; set; }
public virtual Post Post { get; set; }
}
public partial class Post
{
public Post()
{
this.Comments = new HashSet<Comment>();
this.Tags = new HashSet<Tag>();
}
public int Id { get; set; }
public System.DateTime timeDate { get; set; }
public string Body { get; set; }
public virtual ICollection<Comment> Comments { get; set; }
public virtual ICollection<Tag> Tags { get; set; }
}
答案 0 :(得分:2)
在您的控制器中,您正在执行此操作
List<Comment> cmntlist = db.Comments.ToList();
转换为SQL
SELECT * FROM `comments`
因此,您不是要检索相关注释,而是存储在数据库中的所有注释。
你可以使用延迟加载机制,你的控制器看起来像这样
public ActionResult Index()
{
objVmPost.post = new Post();
List<Post> mylist = db.Posts.ToList();
objVmPost.posts = mylist;
return View("Index",objVmPost);
}
或急切加载
public ActionResult Index()
{
objVmPost.post = new Post();
List<Post> mylist = db.Posts.Include(post => post.Comments).ToList();
objVmPost.posts = mylist;
return View("Index",objVmPost);
}
您可以阅读有关lazy loading and eager loading
的更多信息无论您想采用哪种方法,您的foreach循环应如下所示:
foreach(var post in Model.Posts){
<p>@post.Body</p>
<p>@post.timeDate</p>
foreach(var comment in post.Comments){
<p>@comment.Body</p>
}
// here you can add your comment form
}