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c# - ASP.NET MVC 动态模型未被识别

问题描述

我正在尝试在 ASP.NET MVC 应用程序的 1 个视图中使用 2 个模型，并尝试使用此处描述的动态模型方法：https ://www.c-sharpcorner.com/UploadFile/ff2f08/multiple-models-在 MVC 中的单一视图/

这是我的控制器：

细节控制器

    // GET: Statewides/Details/5
        public ActionResult Details(int? id)
        {
            ViewBag.ID = id;
            var today = DateTime.Today;
            var todayAsString = today.ToString("MM/dd/yyyy");
            ViewBag.Today = todayAsString;
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            Statewide statewide = db.Statewides.Find(id);

            var document = from s in db.Documents
                           where s.Statewide_ID == id
                           select s;

            dynamic mymodel = new ExpandoObject();
            mymodel.Statewides = statewide;
            mymodel.Documents = document;

            if (statewide == null)
            {
                return HttpNotFound();
            }
            return View(mymodel);
        }

这是我观点的一部分：

@model  dynamic

@{
    ViewBag.Title = "Details";
}

  <div class="row">
            <div class="col-md-9 text-left">
                <h5><strong>COUNTY:</strong> <span class="box-shadow px-3">@Model.Statewide.COUNTY</span></h5>
            </div>
            <div class="col-md-3 text-right district">
                <h5><strong>District:</strong>@Model.Statewide.District</h5>
            </div>
        </div>

在该页面的底部，我需要访问 Documents 模型：

       <table>
            <tr>
                <th>Doc Type</th>
                <th>Order Date</th>
                <th>Location</th>
            </tr>
            @foreach (Document document in Model.Documents)
            {
                <tr>
                    <td>@document.Doc_Type</td>
                    <td>@document.Order_Date</td>
                    <td>@document.Doc_Location</td>
                </tr>
            }
        </table>

在这里，我收到一条错误Document消息，提示“找不到类型或命名空间文档”。我不确定我做错了什么，因为在我看来，我做了与指南相同的事情。

如果您需要，这里是完整视图，请注意，我没有更改很多从仅在全州范围内的旧模型中检索值的实例。请忽略那些：

@model  dynamic

<!--            CUSTOM CSS          -->
<link href="~/Styles/Documents/DetailsStyle.css" type="text/css" rel="stylesheet">

<!--            GOOGLE ICONS          -->
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">

@{
    ViewBag.Title = "Details";
}

<div class="bigContainer">
    <div class="container-fluid text-center topLabel">
        <div class="borderline">
            <h4 class="title"><strong>DETAIL RECORD - RP ROADWAY HISTORY FILE</strong></h4>
            <div class="row">
                <div class="col-md-1 printButton">
                    <input class="text-left" type="button" onclick="javascript:window.print()" value="Print" runat="server" />
                </div>
                <div class="col-md-11">
                    <p class="text-right">
                        <u>Current Date:</u>
                        <script>document.write(new Date().toLocaleDateString());</script>
                    </p>
                </div>
            </div>
        </div>
        <div class="row">
            <div class="col-md-9 text-left">
                <h5><strong>COUNTY:</strong> <span class="box-shadow px-3">@Model.Statewide.COUNTY</span></h5>
            </div>
            <div class="col-md-3 text-right district">
                <h5><strong>District:</strong>@Model.Statewide.District</h5>
            </div>
        </div>
        <div class="row">
            <div class="col-md-4 text-left">
                <h5><strong>Route No:</strong><span class="box-shadow px-4">@Html.DisplayFor(model => model.RouteNo)</span></h5>
            </div>
            <div class="col-md-4">
                <h5><strong>Sign System:</strong><span class="box-shadow px-4 sign">@Html.DisplayFor(model => model.SignSys)</span></h5>
            </div>
            <div class="col-md-4"></div>
        </div>
        <div class="row">
            <div class="col-md-12 text-left">
                <h5><strong>LocalName:</strong></h5>
            </div>
        </div>
        <div class="row">
            <div class="col-md-4 text-left">
                <h5 class="box-shadow px-3 localName">@Html.DisplayFor(model => model.LocalName)</h5>
            </div>
            <div class="col-md-8"></div>
        </div>
        <div class="row suppMethodDuplicate">
            <div class="col-md-2 text-right">
                <h5><strong>Supp Des:</strong></h5>
            </div>
            <div class="col-md-2 text-left">
                <h5>@Html.DisplayFor(model => model.SuppDes)</h5>
            </div>
            <div class="col-md-2 text-right">
                <h5><strong>Method:</strong></h5>
            </div>
            <div class="col-md-2 text-left">
                <h5>@Html.DisplayFor(model => model.Method)</h5>
            </div>
            <div class="col-md-1"></div>
            <div class="col-md-2 text-left">
                @Html.DisplayFor(model => model.Duplicate_OK)
                <label class="form-check-label" for="duplicateCheck"><strong>Duplicate OK</strong></label>
            </div>
        </div>
        <div class="row">
            <div class="col-md-2 text-right">
                <h5><strong>Date:</strong></h5>
            </div>
            <div class="col-md-2 text-left">
                <h5>@Html.DisplayFor(model => model.ReservedDate)</h5>
            </div>
            <div class="col-md-2 text-right">
                <h5><strong>Original Location:</strong></h5>
            </div>
            <div class="col-md-2 text-left">
                <h5>@Html.DisplayFor(model => model.OriginalL)</h5>
            </div>
        </div>
        <div class="row">
            <div class="col-md-4"></div>
            <div class="col-md-2 text-right">
                <h5><strong>Original D:</strong></h5>
            </div>
            <div class="col-md-6 text-left">
                <h6>@Html.DisplayFor(model => model.OriginalD)</h6>
            </div>
        </div>
        <div class="borderline text-left">
            <h5 class="mb-0"><strong>DOCUMENTS</strong></h5>
        </div>

        <table>
            <tr>
                <th>Doc Type</th>
                <th>Order Date</th>
                <th>Location</th>
            </tr>
            @foreach (Document document in Model.Documents)
            {
                <tr>
                    <td>@document.Doc_Type</td>
                    <td>@document.Order_Date</td>
                    <td>@document.Doc_Location</td>
                </tr>
            }
        </table>


        <div class="borderline text-left">
            <h5 class="mb-0"><strong>PROJECTS</strong></h5>
        </div>
        <h6 class="text-left">@Html.DisplayFor(model => model.Projects)</h6>
        <div class="borderline text-left">
            <h5 class="mb-0"><strong>COMMENTS</strong></h5>
        </div>
        <h6 class="text-left">@Html.DisplayFor(model => model.Comments)</h6>
    </div>

    <p style="margin-top: 20px">
        @Html.ActionLink("Back to List", "Index")
    </p>

</div>

Serge 建议我使用视图模型，所以我尝试了这个：

视图模型

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

namespace Roadway_History.Models
{
    public class ViewModel
    {
        public Statewide Statwide { get; set; }
        public Document Document { get; set; }
    }
}

行动

// GET: Statewides/Details/5
        public ActionResult Details(int? id)
        {
            ViewBag.ID = id;
            var today = DateTime.Today;
            var todayAsString = today.ToString("MM/dd/yyyy");
            ViewBag.Today = todayAsString;
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            var model = new ViewModel
            {


            Statewide statewide = db.Statewides.Find(id);

            var document = from s in db.Documents
                           where s.Statewide_ID == id
                           select s;
            };
            

            if (statewide == null)
            {
                return HttpNotFound();
            }
            return View(model);
        }

但这也行不通。我得到错误

Statewide is a type which is not valid in the given context和ViewModel does not contain a definition for statewide

我相信行动方法是错误的，但我不知道如何解决它。

此外，@model ViewModel在视图中使用会出现错误“找不到类型或命名空间 ViewModel”

标签： c#asp.net-mvcentity-framework.net-coreentity-framework-core

解决方案

如果您需要为一个视图使用两个模型，您可以创建一个包含它们的视图模型

public class ViewModel 
{
 public  Statewide Statwide {get; set;}
 public  List<Document> Documents {get; set;}

}

在视图中

@model ViewModel

行动

var model = new ViewModel
{
   Statewide= ... your code
   Document=... your code
};
......
return View(model);

更新

像这样修复你的视图模型

 var statewide = db.Statewides.FirstOrDefault (i=> i.Id==id);
 if (statewide == null)
            {
                return HttpNotFound();
            }
 var documents = db.Documents.Where(s=> s.Statewide_ID == id).ToList();

            if (documents == null)
            {
                return HttpNotFound();
            }
          
var model = new ViewModel
            {
            Statewide =statewide, 
            Documents = documents
            };

  return View(model);

但您也需要根据新的视图模型修复模型

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