在实体的编辑页面中填充 select 框

Question

我创建了一个 asp.net MVC 应用程序，它使用 entity framework 作为 "fun"。

我有两个实体，一个用于用户，一个用于教师（学校）。每个用户都有一个需要能够改变的教员。我想使用 select 框来执行此操作，其中显示了每个教员的姓名。最后的 HTML 应该是这个样子：

<select>
    <option>Faculty name 1</option>
    <option>Faculty name 2</option>
    <option>Faculty name 3</option>
<select>

下面的代码当前在带有数字类型的文本框中显示教师的 id 值。此 ID 是用户实体的一部分，当前未从教师实体中获取。

我不确定如何

将院系列表传入HTML进行显示
将 selected 教员存储在用户实体教员变量中

Edit.cshtml

@model Purely_Servers.Models.user

<div class="form-group col-md-12">
    <div class="col-md-8">
        @Html.EditorFor(model => model.school, new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(model => model.school, "", new { @class = "text-danger" })
    </div>
</div>

用户控制器

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using Purely_Servers.DAL;
using Purely_Servers.Models;

namespace Purely_Servers.Controllers
{
    public class usersController : Controller
    {
        private serverContext db = new serverContext();

        // GET: users
        public ActionResult Index()
        {
            return View(db.Users.ToList());
        }

        // GET: users/Details/5
        public ActionResult Details(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            user user = db.Users.Find(id);

            if (user == null)
            {
                return HttpNotFound();
            }
            return View(user);
        }

        // GET: users/Create
        public ActionResult Create()
        {
            return View();
        }

        // POST: users/Create
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Include = "id,first_name,last_name,email,house_number,street,city,postcode,authorised,school,archived")] user user)
        {
            if (ModelState.IsValid)
            {
                db.Users.Add(user);

                // find the users school in the database, add the user to the faculty's collection
                var faculty = db.Faculties.Find(user.school);
                user.faculty = faculty;

                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(user);
        }

        // GET: users/Edit/5
        public ActionResult Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            user user = db.Users.Find(id);
            if (user == null)
            {
                return HttpNotFound();
            }
            return View(user);
        }

        // POST: users/Edit/5
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit([Bind(Include = "id,first_name,last_name,email,house_number,street,city,postcode,authorised,school,archived")] user user)
        {
            if (ModelState.IsValid)
            {
                // find the users school in the database, add the user to the faculty's collection
                var faculty = db.Faculties.Find(user.school); // get the value from the page
                user.faculty = faculty;


                db.Entry(user).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(user);
        }

        // GET: users/Delete/5
        public ActionResult Delete(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            user user = db.Users.Find(id);
            if (user == null)
            {
                return HttpNotFound();
            }
            return View(user);
        }

        // POST: users/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public ActionResult DeleteConfirmed(int id)
        {
            user user = db.Users.Find(id);
            db.Users.Remove(user);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                db.Dispose();
            }
            base.Dispose(disposing);
        }
    }
}

用户模型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;

namespace Purely_Servers.Models
{
    [Table("userTable")]
    public class user
    {
        [Key]
        public int id { get; set; }
        public string first_name { get; set; }
        public string last_name { get; set; }
        public string email { get; set; }
        public int house_number { get; set; }
        public string street { get; set; }
        public string city { get; set; }
        public string postcode { get; set; }
        public int authorised { get; set; }
        public int school { get; set; }
        public int archived { get; set; }

        public virtual faculty faculty { get; set; }
    }
}

非常感谢任何帮助

Answer 1

主要变化是您需要将模型传递给视图，而不仅仅是 User 实体。

创建模型：

public class EditUserModel
{
    public user User{get; set;}
    public SelectList FacultyList{get; set;}
}

控制器编辑方法：

public ActionResult Edit(int? id)
{
    var model = new EditUserModel
        {
          User = db.Users.Find(id),
          FacultyList = (from f in db.Faculties
                        select new SelectListItem
                        {
                            Value = f.Id.ToString(),
                            Text = f.Name
                        }).ToList();
        };
     return View(model);
}

查看：

@model EditUserModel

<div>
    <div >
        @Html.EditorFor(model => model.User.school, Model.FacultyList )

    </div>
</div>

还有很多地方需要改进，但这是朝着正确方向迈出的一步。

在实体的编辑页面中填充 select 框

Populate select box within the edit page of an entity

asp.net

asp.net-mvc

entity-framework