CODEWITHSUNDEEP
c#asp.net-mvclinqtreecomments
Jeyhun Rahimov
Jeyhun Rahimov

Reputation: 3787

How group list elements by parent ID like tree in c# MVC4 application?

I have Comment model like this:

public class Comment
    {
        public int? ParentId { get; set; }
        public string Text { get; set; }
        public int ProjectId { get; set; }
        public int UserWhoTypeId { get; set; }
    }

I want to show comments one under another by parentID . Parent Comments will seems in div, child Comments will seems in 

<ul>
   <li>
      child comments go here
   </li>
</ul>

For example, 

  <ul>
       <li>
          <div>
               parent comments go here
          </div>
          <ul>
             <li>
                 child comments go here
             </li>
           </ul>
       </li>
  </ul>

I firstly need to collect Comments with LINQ like tree and then apply it like shown above in view. Any links or advice please.

Edit:

I created model as

public class CommentListModel
{
    public Comment Comment{ get; set; }
    public List<Comment> Childs { get; set; }
}

And I collected all comments in 1 list:

List<CommentListModel>  CommentHierarchy = MyService.GetCommentHierarchy();

Now, I need to show CommentHierarchy in view like tree hierarchy. Please help.

Upvotes: 1

Views: 1324

Answers (1)

maf748
maf748

Reputation: 788

You can change the "Childs" Property of CommentListModel to be a collection of CommentListModel like so:

public class CommentListModel
{
    public Comment Comment { get; set; }
    public List<CommentListModel> Childs { get; set; }
}

Create a partial view as a display template (put file under DisplayTemplates folder) for CommentListModel:

@model CommentListModel
<ul>
    <li>
        <div>@Html.DisplayFor(m => m.Comment.Text)</div>
        @Html.DisplayFor(m => m.Childs)
    </li>
</ul>

Then in your parent view, simply call:

 @Html.DisplayFor(m => m)

Assuming the model of the parent view is a collection of CommentListModel objects.

This will allow your list to recurse as deeply as your collection goes.

Upvotes: 2

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