asp.net mvc 实现博客文章的用户回复功能

实现博客文章的用户回复功能需要以下步骤：

1. 创建评论模型

创建一个评论模型，包含评论的内容、评论时间、评论者等信息。例如：

public class Comment
{
    public int Id { get; set; }

    [Required]
    public string Content { get; set; }

    public DateTime CreatedAt { get; set; }

    public string UserId { get; set; }

    public virtual ApplicationUser User { get; set; }

    public int PostId { get; set; }

    public virtual Post Post { get; set; }
}

2. 创建评论控制器

创建一个评论控制器，包含添加评论和删除评论的方法。例如：

public class CommentController : Controller
{
    private ApplicationDbContext db = new ApplicationDbContext();

    [HttpPost]
    public ActionResult Create(int postId, string content)
    {
        var comment = new Comment
        {
            Content = content,
            CreatedAt = DateTime.Now,
            UserId = User.Identity.GetUserId(),
            PostId = postId
        };

        db.Comments.Add(comment);
        db.SaveChanges();

        return RedirectToAction("Details", "Post", new { id = postId });
    }

    [HttpPost]
    public ActionResult Delete(int id)
    {
        var comment = db.Comments.Find(id);

        if (comment != null && comment.UserId == User.Identity.GetUserId())
        {
            db.Comments.Remove(comment);
            db.SaveChanges();
        }

        return RedirectToAction("Index", "Home");
    }
}

3. 添加评论视图

在文章详情页中添加评论视图，包含评论表单和已有评论列表。例如：

@model PostViewModel

...

<h2>Comments</h2>
@if (User.Identity.IsAuthenticated)
{
    <form action="@Url.Action("Create", "Comment")" method="post">
        @Html.AntiForgeryToken()
        <div class="form-group">
            <label for="content">Content:</label>
            <textarea name="content" class="form-control"></textarea>
        </div>
        <input type="hidden" name="postId" value="@Model.Post.Id" />
        <button type="submit" class="btn btn-primary">Submit</button>
    </form>
}
else
{
    <p>Please <a href="@Url.Action("Login", "Account")">log in</a> to leave a comment.</p>
}

@if (Model.Comments.Any())
{
    <ul class="list-group">
        @foreach (var comment in Model.Comments)
        {
            <li class="list-group-item">
                <div>
                    <strong>@comment.User.UserName</strong>
                    <span class="text-muted">@comment.CreatedAt.ToString("yyyy-MM-dd HH:mm:ss")</span>
                </div>
                <div>@comment.Content</div>
                @if (User.Identity.IsAuthenticated && comment.UserId == User.Identity.GetUserId())
                {
                    <form action="@Url.Action("Delete", "Comment")" method="post">
                        @Html.AntiForgeryToken()
                        <input type="hidden" name="id" value="@comment.Id" />
                        <button type="submit" class="btn btn-link">Delete</button>
                    </form>
                }
            </li>
        }
    </ul>
}
else
{
    <p>No comments yet.</p>
}

4. 更新文章详情页

在文章详情页中添加评论视图，显示已有评论并允许用户添加评论。例如：

public class PostController : Controller
{
    private ApplicationDbContext db = new ApplicationDbContext();

    public ActionResult Details(int id)
    {
        var post = db.Posts.Find(id);

        if (post == null)
        {
            return HttpNotFound();
        }

        var comments = db.Comments
            .Where(c => c.PostId == id)
            .Include(c => c.User)
            .OrderByDescending(c => c.CreatedAt)
            .ToList();

        var model = new PostViewModel
        {
            Post = post,
            Comments = comments
        };

        return View(model);
    }
}

以上就是ASP.NET MVC实现博客文章的用户回复功能的步骤。