小编San*_*wat的帖子

我知道这个问题被问过这么多次.我已阅读并实施了所有解决方案但未获得成功.当我使用EF从数据库检索数据并在View上使用此模型后与模型绑定时,我收到此错误.

我的控制器代码是

using System.Linq;
using System.Web.Mvc;
using JsonRenderingMvcApplication.Models;

namespace JsonRenderingMvcApplication.Controllers
{
    public class PublisherController : Controller
    {
        public ActionResult Index()
        {
            PublisherModel model = new PublisherModel();
            using (DAL.DevelopmentEntities context = new DAL.DevelopmentEntities())
            {               
                model.PublisherList = context.Publishers.Select(x =>
                                        new SelectListItem()
                                        {
                                            Text = x.Name,
                                            Value = x.Id.ToString()
                                        }); ;
                           }
            return View(model);
        }

    }
}

我的查看代码是

@model JsonRenderingMvcApplication.Models.PublisherModel

@{
    ViewBag.Title = "Index";
}
<div>
    @Html.DisplayFor(model=>model.Id)
    @Html.DropDownListFor(model => model.Id, Model.PublisherList);
</div>
<div id="booksDiv">

</div>

我的型号代码是

using System.Collections.Generic;
using System.Web.Mvc;
using System.ComponentModel.DataAnnotations;

namespace …

我收到错误消息“没有为此对象定义无参数构造函数”。在MVC 5应用程序中。

控制器是：

public class HomeController : Controller
    {
        private  IUserService userService;

        public HomeController(IUserService userService)
        {
            this.userService = userService;
        }

        [HttpGet]
        public ActionResult Index()
        {
            var user = userService.GetUser();
            return View();
        }
    }

Ninject WebCOmmon CS类是：

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(QuestionWave.Web.App_Start.NinjectWebCommon), "Start")]
[assembly: WebActivatorEx.ApplicationShutdownMethodAttribute(typeof(QuestionWave.Web.App_Start.NinjectWebCommon), "Stop")]

namespace QuestionWave.Web.App_Start
{
    using System;
    using System.Web;

    using Microsoft.Web.Infrastructure.DynamicModuleHelper;

    using Ninject;
    using Ninject.Web.Common;
    using QuestionWave.Data;
    using QuestionWave.Service;

    public static class NinjectWebCommon 
    {
        private static readonly Bootstrapper bootstrapper = new Bootstrapper();

        /// <summary>
        /// Starts the application
        /// </summary> …