学习ASP.Net MVC并在'/'应用程序中构建用户管理器服务器错误

Question

For one of my classes I'm just getting started in learning how to develop web applications in ASP.Net MVC5. One of the things we're required to do is redesign the view of a simple user account manager, with the code already given to us to work with and modify.

The problem is, when I actually run the code in Visual Studio, I get 404 error that says Server Error in '/' Application .

I'm fairly certain the code worked when it was presented in the classroom, but I can't get it to work here.

Here's the sample code, for those interested:

UserManagerController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace CS610W6.Controllers
{
    public class UserManagerController : Controller
    {
        //
        // GET: /UserManager/
        public ActionResult Index()
        {
            //Use the application's DB context to access the Identity framework's users
            var UserList = new CS610W6.Models.ApplicationDbContext().Users.ToList();

            //Pass the UserList to the view
            return View(UserList);
        }
    }
 }

index.cshtml

@model List<CS610W6.Models.ApplicationUser>
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>
@foreach (var item in Model)
{
    @item.UserName<br />
    @item.PasswordHash<br />
    @item.Id<br />
    @Html.ActionLink("Edit", "Edit", new { id = item.Id })
}

EDIT: Here is the full text of the error, as shown in the browser,

Server Error in '/' Application.

The resource cannot be found.

Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

Requested URL: /Views/index.cshtml

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34274

Answer 1

As you're new to MVC, I assume you get this error when you try to run your application at very first time.

As we can see in your error, requested URL is /Views/index.cshtml .

This error simply means, application cannot found any route. You can either check with URL yourdomain/UserManager/Index

Or you can set default action to make change in RouteConfig

 routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "UserManager", action = "Index", id = UrlParameter.Optional }
            );

Here is also a good document for ASP.NET Routing

Hope this helps!