c# - ViewBag 不保存状态

问题描述

我测试了我的应用程序，在测试时我发现了一个错误，我认为它来自 ViewBage。我有 500 名医生和专业的列表，当我想编辑电话、地址等时，下拉菜单会显示列表中第一个的 SpeciltyName，因此它不会保存医生的 SpeciltyName 你可以查看下面的图片以更好地理解

联系人控制器.cs

// GET: Contacts/Edit/5
        public async Task<ActionResult> Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Contact contact = await db.Contacts.FindAsync(id);
            if (contact == null)
            {
                return HttpNotFound();
            }

            ViewBag.TypeId = new SelectList(db.ContactTypes, "Id", "Name", contact.TypeId);
            ViewBag.CategoryId = new SelectList(db.ContactCategories.Where(s => s.Name != "Attorney" && s.Name != "Law Firm"), "Id", "Name", contact.CategoryId);
            ViewBag.ConCompanyId = new SelectList(db.Contacts.Where(s => s.ContactCategory.Name == "Insurance Carrier" || s.ContactCategory.Name == "Facility"), "Id", "Firstname");
            return View(contact);
        }

        // POST: Contacts/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 async Task<ActionResult> Edit([Bind(Include = "Id,UserId,Title,Firstname,Lastname,isCompany,CategoryId,TypeId,DateOfBirth,Address1,Address2,City,State,Zip,Email,Mobile,Phone,Website,Country,LocationGPS,Gender,Notes,Latitude,Longitude")] Contact contact)
        {
            if (ModelState.IsValid)
            {

                db.Entry(contact).State = EntityState.Modified;
                await db.SaveChangesAsync();
                return RedirectToAction("Index");
            }



            //ViewBag.Title = new SelectList(new[] { "Mr.", "Ms." }, contact.Title);
            ViewBag.TypeId = new SelectList(db.ContactTypes, "Id", "Name", contact.TypeId);
            ViewBag.CategoryId = new SelectList(db.ContactCategories.Where(s => s.Name != "Attorney" && s.Name != "Law Firm"), "Id", "Name", contact.CategoryId);
            ViewBag.ConCompanyId = new SelectList(db.Contacts.Where(s => s.ContactCategory.Name == "Insurance Carrier" || s.ContactCategory.Name == "Facility"), "Id", "Firstname");
            return View(contact);
        }

有什么帮助吗？

标签： c#.netmodel-view-controller

c# - ViewBag 不保存状态

问题描述

解决方案

推荐阅读