获取IEnumerable错误:CS1061不包含C#ASP.NET MVC5

Question

我无法找到解决问题的方法,我尝试了很多替代方案,但我无法解决.

我首先使用模型生成我的数据库,之后我使用Scaffolding生成视图(索引,创建,编辑,删除..).唯一的视图(索引)与模型使用IEnumerable.

索引视图是:

@model IEnumerable<CAD_CMDBv2.Models.Location>

@{
    ViewBag.Title = "Location's Management";
}

<h2>All Locations</h2>

<p>
    @Html.ActionLink("Create Location", "Create")
</p>

    <table class="table">
         <tr>
              <th>
                    @Html.DisplayNameFor(model => model.Location.site_name)
              </th>
              <th>
                    @Html.DisplayNameFor(model => model.Location.country_name)
              </th>
              <th>
                    @Html.DisplayNameFor(model => model.Location.region_name)
              </th>
              <th></th>
        </tr>

        @foreach(var item in Model) {
            <tr>
                 <td>
                      @Html.DisplayFor(modelItem => item.Location.site_name)
                 </td>
                 <td>
                      @Html.DisplayFor(modelItem => item.Location.country_name)
                 </td>
                 <td>
                      @Html.DisplayFor(modelItem => item.Location.region_name)
                 </td>
                 <td>
                      @Html.ActionLink("Edit", "Edit", new { id = item.Location.location_id }) |
                      @Html.ActionLink("Details", "Details", new { id = item.Location.location_id }) |
                      @Html.ActionLink("Delete", "Delete", new { id = item.Location.location_id })
                 </td>
           </tr>
           }
     </table>

我想为数据集插入一个异步表单,这样就变成:

@model IEnumerable<CAD_CMDBv2.Models.RechercheLocationViewModel>

@{
    ViewBag.Title = "Location's Management";
}

<h2>All Locations</h2>

<p>
    @Html.ActionLink("Create Location", "Create")
</p>

@using (Html.BeginForm("Search", "Restaurant", FormMethod.Get))
{
    @Html.TextBoxFor(r => r.Recherche)
    <input type="submit" value="Rechercher" />

    <p>Search Results </p>
    if (Model.ListeLocations.Count == 0)
    {
        <p> No Results but you can create it !</p>
    }
    else
    {
        <table class="table">
            <tr>
                <th>
                    @Html.DisplayNameFor(model => model.Location.site_name)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Location.country_name)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Location.region_name)
                </th>
                <th></th>
            </tr>

        @foreach(var item in Model) {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.Location.site_name)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Location.country_name)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Location.region_name)
                </td>
                <td>
                    @Html.ActionLink("Edit", "Edit", new { id = item.Location.location_id }) |
                    @Html.ActionLink("Details", "Details", new { id = item.Location.location_id }) |
                    @Html.ActionLink("Delete", "Delete", new { id = item.Location.location_id })
                </td>
            </tr>
        }
        </table>
    }
}

我在添加View Model类时修改了模型,以允许IndexView通过接管参数Locations并使用Search参数作为View Model的模型:

//------------------------------------------------------------------------------
// <auto-generated>
//     Ce code a été généré à partir d'un modèle.
//
//     Des modifications manuelles apportées à ce fichier peuvent conduire à un comportement inattendu de votre application.
//     Les modifications manuelles apportées à ce fichier sont remplacées si le code est régénéré.
// </auto-generated>
//------------------------------------------------------------------------------

namespace CAD_CMDBv2.Models
{
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    public partial class Location
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Location()
        {
            this.User = new HashSet<User>();
            this.host = new HashSet<Host>();
            this.client_catia = new HashSet<Client_catia>();
            this.client_smartam = new HashSet<Client_smarteam>();   
        }

        public int location_id { get; set; }
        [Display(Name = "Site's Name")]
        public string site_name { get; set; }
        [Display(Name = "Country's Name")]
        public string country_name { get; set; }
        [Display(Name = "Region's Name")]
        public string region_name { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<User> User { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Host> host { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Client_catia> client_catia { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Client_smarteam> client_smartam { get; set; }    
    }
    public class RechercheLocationViewModel : IEnumerable<Location> {
        public string Recherche {get; set;}
        public Location Location { get; set; }
        public List<Location> ListeLocations;

        public IEnumerator<Location> GetEnumerator()
        {
            return ListeLocations.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return ListeLocations.GetEnumerator();
        }
    }   
}

目前的控制器

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using CAD_CMDBv2.Models;


namespace CAD_CMDBv2.Areas.Locations.Controllers
{
    public class LocationsController : Controller
    {
        private ModeleDonneesCMDBContext db = new ModeleDonneesCMDBContext();

        // GET: Locations/Locations
        public ActionResult Index()
        {
            var liste =  db.Locations.ToList();
            var listeTriee = liste.OrderBy(t => t.site_name);

            return View(listeTriee);
        }
        ...

但是在行索引视图中会产生两个关于IEnumerable的相同类型的错误:

@Html.TextBoxFor(r => r.Recherche)

和

if (Model.ListeLocations.Count == 0)

我收到了这个错误:

CS1061错误"的IEnumerable"不包含关于"ListeLocations"的定义和没有扩展方法"ListeLocations"接受类型"的IEnumerable"的第一个参数可以找到(是否缺少using指令或程序集引用？)

那是什么意思？我该如何解决这个问题？理解IEnumerable接口仍然有些困难.

Answer 1

这就是你的错误所在：

var listeTriee = liste.OrderBy(t => t.site_name);

return View(listeTriee);

您不是将单个模型传递给您，而是传递了一个确实不具有该属性的View集合 ( ) 。IEnumerableListeLocations

您应该创建一个视图模型并将集合放入其中：

public class ListeTrieeViewModel
{
    ...
    public IEnumerable<Locations> ListeLocations {get; set;}
}

然后您可以在控制器中传递该模型：

    public ActionResult Index()
    {
        var liste =  db.Locations.ToList();
        var listeTriee = liste.OrderBy(t => t.site_name);
        var viewModel = new ListeTrieeViewModel { ListeLocations = listeTriee; }

        return View(viewModel);
    }

现在您在视图中的签入将起作用：

if (Model.ListeLocations.Count() == 0)