Question

我有一个生成的视图，其中包含“待办事项”列表我正在尝试为生成的删除链接创建Delete方法。我创建了一个ListController，它已经处理了添加到列表数据库的问题。现在我试图让列表删除项目。这是我的ListController：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MyBasicListApp2.Models.DB;
using MyBasicListApp2.Models.EntityManager;
using System.Data.Entity;

namespace MyBasicListApp2.Controllers
{
    public class ListController : Controller
    {
        // GET: List
        public ActionResult Index()
        {
            return View();
        }

        // First I create a todolist action that is used to receive the default ToDoList page
        // Second I create a post todolist action for submitting form info on the page.
        // In the method I check to see if the filled out viewmodel contains valid model data state
        // If data is valid then I create an EntityManager object (contains logic method) so I can use
        // the addtolist method I made in the ListManager (EntityManager).
        // Next I will authenticate the form and set an auth cookie for incase the current session does
        // not include cookies.

        public ActionResult ToDoList()
        {
            return View();
        }


        // In the post I pass in the viewmodel that the view will use to collect information
        [HttpPost]
        public ActionResult ToDoList(tblBasicList LVM)
        {
            if (ModelState.IsValid)
            {
                ListManager LM = new ListManager();
                // Addtolist is a method belonging to ListManager and can only be called if ListManager 
                // object is created in the current context.
                LM.AddToList(LVM);
                return RedirectToAction("MyToDoList", "Home");

            }
            return View();
        }

        // Delete method
        // First create the actionresult for the edit call
        // Get method
        public ActionResult Delete()
        {
            return View();
        }

        [HttpPost]
        public ActionResult Delete(int BasicListID)
        {
            using (MyBasicListAppEntities db = new MyBasicListAppEntities())
            {
                ListManager LM = new ListManager();
                LM.Remove(BasicListID);
                return RedirectToAction("MyToDoList", "Home");
            }
        }

    }
}

我有一个单独的类来处理我的实体框架方法，用于添加和删除：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using MyBasicListApp2.Models.DB;

namespace MyBasicListApp2.Models.EntityManager
{
    public class ListManager
    {
        public void AddToList(tblBasicList LVM)
        {
            using (MyBasicListAppEntities db = new MyBasicListAppEntities())
            {
                tblBasicList TBL = new tblBasicList();
                TBL.InputDate = LVM.InputDate;
                TBL.InputItem = LVM.InputItem;
                TBL.InputImportance = LVM.InputImportance;
                TBL.ItemCompletion = LVM.ItemCompletion;

                db.tblBasicLists.Add(TBL);
                db.SaveChanges();
            }
        }     
        public void Remove(int id)
        {
            MyBasicListAppEntities db = new MyBasicListAppEntities();

            tblBasicList objDelete = db.tblBasicLists.Find(id);
            db.tblBasicLists.Remove(objDelete);
            db.SaveChanges();
        }
    }
}

我从“MyToDoList.cshtml”视图开始：

@model IEnumerable<MyBasicListApp2.Models.DB.tblBasicList>

@{
    ViewBag.Title = "MyToDoList";
}

<h2>MyToDoList</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.InputDate)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.InputItem)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.InputImportance)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.ItemCompletion)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.InputDate)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.InputItem)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.InputImportance)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.ItemCompletion)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.BasicListID }) |
            @Html.ActionLink("Details", "Details", new { id=item.BasicListID }) |
            @Html.ActionLink("Delete", "Delete", "List", new { id=item.BasicListID })
        </td>
    </tr>
}

</table>

从这里我选择列表中的一个项目（我现在大约有6个。add方法工作正常）。但是，当我单击“删除”按钮时，出现“资源未找到”错误。它甚至不会重定向到删除视图，我很难弄清楚原因。目标是指向删除页面，点击所选项目的删除，然后重定向回“MyToDoList”页面。有什么想法吗？

Answer 1

要获得简短的回答，请将Delete方法（对于HTTP GET）更改为

public ActionResult Delete(int id)
{
     tblBasicList todoItem = FindTodoItem(id); //with whatever method to get that todo item
     return View(todoItem);
}

我猜您正在尝试使用ASP.NET MVC创建一个Web应用程序。控制器/视图/模型有一些命名约定。我会在此链接http://www.asp.net/mvc/overview/getting-started/introduction/getting-started

中推荐一些教程供您参考

Answer 2

对于像Delete这样的Controller，你不需要Get和a [HttpPost]，因为它没有实际的视图。

   public ActionResult Delete(int BasicListID)
    {
        MyBasicListAppEntities db = new MyBasicListAppEntities();
        tblBasicList objDelete = db.tblBasicLists.Find(id);
        db.tblBasicLists.Remove(objDelete);//this can actually be simplified 
        return RedirectToAction("Home");
    }

你只需要将它重定向到像家一样的控制器而不将列表传递给它，家庭控制器将负责传递列表。

无法获取Delete方法。我试过调试，它似乎甚至没有指向方法

2 个答案: