在这种情况下如何创建 Edit 方法？ ASP.NET 核心 MVC

Question

我尝试基于另一个控制器创建编辑操作。

但在这种特殊情况下，我做不到。

我的帖子回复没有使用单独的模型，而是根据帖子 ID 保留它。

这是我尝试过的

[Get] Edit 来自控制器的方法：

[Authorize]
        [HttpGet]
        public IActionResult Edit(int id)
        {
            var userId = _userManager.GetUserId(HttpContext.User);
            if (userId == null)
            {
                return View("AccessDenied");
            }

            var rep = _context.PostReplies.Find(id);

            if (rep == null)
            {
                ViewBag.ErrorMessage = $"Post with ID = {rep} cannot be found";
                return View("NotFound");
            }

            PostReply reply = _context.PostReplies.Find(rep);

            if (reply == null)
            {
                return View("NotFound");
            }

            if (userId == reply.User.Id || User.IsInRole("Admin") || User.IsInRole("Mod"))
            {
                return View(reply);
            }
            else
            {
                return View("NotFound");
            }
        }

[发布]编辑方法：

[HttpPost]
        [ValidateAntiForgeryToken]
        public IActionResult Edit([Bind(include: "Id, Content, Created, Updated")] PostReply reply)
        {
            if (ModelState.IsValid)
            {
                _context.Entry(reply).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
                _context.SaveChanges();
                return RedirectToAction("Manage");
            }
            return View(reply);
        }

这是“模型”PostReply：

using System;

namespace collector_forum.Data.Models
{
    public class PostReply
    {
        public int Id { get; set; }
        public string Content { get; set; }
        public DateTime Created { get; set; }
        public DateTime Updated { get; set; }

        public virtual ApplicationUser User { get; set; }
        public virtual Post Post { get; set; }
    }
}

这在我的 ApplicationDbContext

中声明

public DbSet<PostReply> PostReplies { get; set; }

这是我负责显示帖子回复的 HTML 代码部分。

@if (Model.Replies.Any())
    {
        foreach (var reply in Model.Replies)
        {
            <div class="row replyContent">
                <div class="col-md-3 replyAuthorContainer">
                    <a class="userName" asp-controller="Profile" asp-action="Detail" asp-route-id="@reply.AuthorId">
                        @reply.AuthorName
                    </a>
                    @if (reply.IsAuthorAdmin && Model.IsAuthorMod)
                    {
                        <div class="isAdmin smaller">Admin</div>
                    }
                    else if (reply.IsAuthorMod)
                    {
                        <div class="isMod smaller">Mod</div>
                    }
                    <br />
                    <span class="postDate">@reply.Date</span>
                </div>
                <div class="col-md-9 replyContentContainer">
                    <div class="postContent">
                        @Html.Raw(reply.ReplyContent)
                    </div>
                </div>
                @if (Model.AuthorName.Contains(User.Identity.Name) || User.IsInRole("Admin"))
                {
                    <span class="col-auto">
                        <a asp-controller="Reply" asp-action="Edit" asp-route-id="@reply.Id" class="btn btn-editPost">
                            Edit Reply
                        </a>
                    </span>
                }
                else if (Model.AuthorName.Contains(User.Identity.Name))
                {
                    <form asp-action="Delete" asp-controller="Reply" asp-route-id="@reply.Id" method="post">
                        <button type="submit" class="btn btn-danger"
                                onclick="return confirm('Are you sure you want to delete post: @Model.Title')">
                            Delete
                        </button>
                    </form>
                }
            </div>
        }
    }

点击“编辑”后显示当前代码this error

我的问题出现了，是否可以以不同的方式实施此操作？

//编辑

问题是“Find”函数没有找到除“Id”、“Content”、“Created”、“Updated”之外的其他值。为了让登录的用户编辑他自己的回复，我需要获取用户详细信息并发布详细信息。 userId、UserName、postId..等

这是属性值 - image

Answer 1

您可以像这样更改您的编辑操作：

[Authorize]
        [HttpGet]
        public IActionResult Edit(int id)
        {
            var userId = _userManager.GetUserId(HttpContext.User);
            if (userId == null)
            {
                return View("AccessDenied");
            }

            var rep = _context.PostReplies.Find(id);

            if (rep == null)
            {
                ViewBag.ErrorMessage = $"Post with ID = {rep} cannot be found";
                return View("NotFound");
            }

            if (userId == rep.User.Id || User.IsInRole("Admin") || User.IsInRole("Mod"))
            {
                return View(rep);
            }
            else
            {
                return View("NotFound");
            }
        }

你有_context.PostReplies.Find(id);的代表，所以你不需要使用PostReply reply = _context.PostReplies.Find(rep);，并再次检查它是否为null，你还需要将一个int类型而不是PostReply放入_context.PostReplies.Find(xxx)。