Asp.net mvc 3 Public ActionResult Delete（int-id，brand-brand）-空品牌对象（MVC3和实体框架）
我正在学习使用实体框架的MVC 3，我的控制器中的删除操作结果方法有问题。我有两种用于删除的ActionResult方法，一种是使用[HttpPost]将数据提交到数据库，另一种是使用基于ID的正确记录填充视图 我的问题是我的参数中有一个null对象，所以当我尝试提交一个delete事务时，它看不到正确的值，因为我有一个null对象和null值Asp.net mvc 3 Public ActionResult Delete（int-id，brand-brand）-空品牌对象（MVC3和实体框架）,asp.net-mvc-3,entity-framework-4.1,null-object-pattern,Asp.net Mvc 3,Entity Framework 4.1,Null Object Pattern,我正在学习使用实体框架的MVC 3，我的控制器中的删除操作结果方法有问题。我有两种用于删除的ActionResult方法，一种是使用[HttpPost]将数据提交到数据库，另一种是使用基于ID的正确记录填充视图 我的问题是我的参数中有一个null对象，所以当我尝试提交一个delete事务时，它看不到正确的值，因为我有一个null对象和null值 using System; using System.Collections.Generic; using System.Linq; using Sys
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using DBFirstMVC.Models;
namespace DBFirstMVC.Controllers
{
public class BrandController : Controller
{
// Instantiate model of my database when controller is called
//TestBradEntities db = new DBFirstMVC.Models.TestBradEntities();
//
// GET: /Brand/
public ActionResult Index()
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
return View(db.Brands.ToList());
}
}
//
// GET: /Brand/Details/5
public ActionResult Details(int id)
{
return View();
}
//
// GET: /Brand/Create
public ActionResult Create()
{
return View();
}
//
// POST: /Brand/Create
[HttpPost]
public ActionResult Create(Brand brand)
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
db.Brands.Add(brand);
db.SaveChanges();
}
return RedirectToAction("Index");
}
//
// GET: /Brand/Edit/5
public ActionResult Edit(int id)
{
try
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
return View(db.Brands.Find(id));
}
}
catch (Exception ex)
{
return View(ex.ToString());
}
}
//
// POST: /Brand/Edit/5
[HttpPost]
public ActionResult Edit(int id, Brand brand)
{
try
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
db.Entry(brand).State = System.Data.EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
}
catch (Exception ex)
{
return View();
}
}
//
// GET: /Brand/Delete/5
public ActionResult Delete(int id)
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
return View(db.Brands.Find(id));
}
}
//
// POST: /Brand/Delete/5
[HttpPost]
public ActionResult Delete(int id, Brand brand)
{
try
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
db.Entry(brand).State = System.Data.EntityState.Deleted;
db.SaveChanges();
}
return RedirectToAction("Index");
}
catch
{
return View();
}
}
}
}
[HttpPost]
public ActionResult Delete(int id, Brand brand)
[HttpPost]
public ActionResult Edit(int id, Brand brand)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using DBFirstMVC.Models;
namespace DBFirstMVC.Controllers
{
public class BrandController : Controller
{
// Instantiate model of my database when controller is called
//TestBradEntities db = new DBFirstMVC.Models.TestBradEntities();
//
// GET: /Brand/
public ActionResult Index()
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
return View(db.Brands.ToList());
}
}
//
// GET: /Brand/Details/5
public ActionResult Details(int id)
{
return View();
}
//
// GET: /Brand/Create
public ActionResult Create()
{
return View();
}
//
// POST: /Brand/Create
[HttpPost]
public ActionResult Create(Brand brand)
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
db.Brands.Add(brand);
db.SaveChanges();
}
return RedirectToAction("Index");
}
//
// GET: /Brand/Edit/5
public ActionResult Edit(int id)
{
try
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
return View(db.Brands.Find(id));
}
}
catch (Exception ex)
{
return View(ex.ToString());
}
}
//
// POST: /Brand/Edit/5
[HttpPost]
public ActionResult Edit(int id, Brand brand)
{
try
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
db.Entry(brand).State = System.Data.EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
}
catch (Exception ex)
{
return View();
}
}
//
// GET: /Brand/Delete/5
public ActionResult Delete(int id)
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
return View(db.Brands.Find(id));
}
}
//
// POST: /Brand/Delete/5
[HttpPost]
public ActionResult Delete(int id, Brand brand)
{
try
{
using (var db = new DBFirstMVC.Models.TestBradEntities1())
{
db.Entry(brand).State = System.Data.EntityState.Deleted;
db.SaveChanges();
}
return RedirectToAction("Index");
}
catch
{
return View();
}
}
}
}
有人知道如何解决这个问题吗？谢谢。我为解决此问题所做的是添加以下代码行：
brand = db.Brands.Find(id);
这似乎找到了与作为int ID参数传递给ActionResult方法的ID相关联的正确数据。我不明白为什么编辑actionresult方法有效，但这不起作用，但这是我可以接受的解决方案。我也有同样的问题 我将find的代码行放在第一位：
[HttpPost]
public ActionResult Delete(int id, Student student)
{
try
{
using (var schoolClient = new SchoolSrvManagerClient())
{
student = schoolClient.GetStudent(id);
student.MarkAsDeleted<Student>();
schoolClient.UpdateStudent(student);
}
return RedirectToAction("ShowStudents");
}
catch (Exception)
{
return View();
}
}
[HttpPost]
公共行动结果删除（int id，学生）
{
尝试
{
使用（var schoolClient=new SchoolSrvManagerClient（））
{
student=schoolClient.GetStudent（id）；
student.MarkAsDeleted（）；
schoolClient.UpdateStudent（学生）；
}
返回重定向到操作（“ShowStudents”）；
}
捕获（例外）
{
返回视图（）；
}
}
@model SchoolSTEModel.Student
@{
ViewBag.Title = "Delete";
}
<h2>Delete</h2>
<h3>Are you sure you want to delete this?</h3>
<fieldset>
<legend>Student</legend>
<div class="display-label">StudentName</div>
<div class="display-field">
@Html.DisplayFor(model => model.StudentName)
</div>
<div class="display-label">StandardId</div>
<div class="display-field">
@Html.DisplayFor(model => model.StandardId)
</div>
</fieldset>
@using (Html.BeginForm()) {
<p>
<input type="submit" value="Delete" /> |
@Html.ActionLink("Back to List", "Index")
</p>
}
@model SchoolSTEModel.Student
@{
ViewBag.Title=“删除”；
}
删除
是否确实要删除此项？
学生
学生姓名
@DisplayFor（model=>model.StudentName）
标准ID
@DisplayFor（model=>model.StandardId）
@使用（Html.BeginForm（））{
|
@ActionLink（“返回列表”、“索引”）
}