Question

我开始学习asp.net MVC，我对将数据发送到VIEW感到困惑。我有一个课程派遣：

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

namespace Logistic.Models
{
    public class Dispatch
    {
        public int DispatchId { get; set; }
        public int TrackingId { get; set; }
        public int CustomerId { get; set; }
        public int RecipientId { get; set; }
        public int CityId { get; set; }
        public DateTime Delivered { get; set; }
        public string Notes { get; set; }
    }
}

另一个班级城市：

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

namespace Logistic.Models
{
    public class City
    {
        public int CityId { get; set; }
        public string Name { get; set; }
    }
}

班级客户：

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

namespace Logistic.Models
{
    public class Client
    {
        public int ClientId { get; set; }
        public string Name { get; set; }
    }
}

从我的Dispatch类中，CustomerId和RecipientId将与类Client相关; CityId与City相关。

我创建了我的上下文类：

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Linq;
using System.Web;

namespace Logistic.Models
{
    public class LogisticContext : DbContext
    {
        public DbSet<Dispatch> Dispatches { get; set; }
        public DbSet<Client> Clients { get; set; }
        public DbSet<Driver> Drivers { get; set; }
        public DbSet<City> Cities { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        }
    }
}

这是我的控制器：

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

namespace Logistic.Controllers
{
    public class HomeController : Controller
    {
        private LogisticContext db = new LogisticContext();

        public ActionResult Dispatch()
        {
            var dispatches = db.Dispatches.ToList();

            return View(dispatches);
        }
    }
}

问题是在我的View类中，我不知道如何显示客户名称，收件人姓名和城市名称。我只能显示CustomerId，RecipientId和CityId。

查看：

@model IEnumerable<Logistic.Models.Dispatch>

@{
    ViewBag.Title = "Dispatch";
}

<h2>Dispatch</h2>

@foreach(var item in Model)
{
    <h2></h2>
}

由于

Answer 1

如果您已建立关系......

如果您已经在这些属性之间定义了关系，则通常可以使用// Pull all of the dispatches and their related cities var dispatchesWithCities = db.Dispatches.Include("Cities") .ToList();方法提取相关实体，如下所示：

item.City.Name

如果你这样做并且拥有适当的关系，那么你就可以迭代并访问public class DispatchViewModel { public Dispatch Dispatch { get; set; } public City City { get; set; } public Client Client { get; set; } public Driver Driver { get; set; } }，但是在你当前的场景中看起来并不像这样。

没有关系......

如果你没有这些“硬”关系，你仍然可以执行一些数据库查询来提取你需要的属性并构建一个ViewModel，但它不会有如此多的结果：

// Build your Dispatches with related information
var dispatchModels = db.Dispatches.AsEnumerable()
                                  .Select(d => new DispatchViewModel()
                                  {
                                      Dispatch = d,
                                      City = db.Cities.FirstOrDefault(c => c.CityId == d.CityId),
                                      Client = db.Clients.FirstOrDefault(c => c.ClientId == d.CustomerId),
                                      ...
                                  });

然后使用每个Dispatch对象并将它们映射到相关属性：

@foreach(var item in Model)
{
    <h2>@item.Dispatch.DispatchId</h2>
    <ul>
        <li>
           <b>City</b>: @item.City.Name
           <!-- Other stuff here -->
        </li>
    </ul>
}

此时，您可以简单地遍历集合并通过引用循环中的迭代器来输出它们：

@Bean
public ManagementHelper getManagementHelperInstance() {
    return new ManagementHelper();
}

Answer 2

您可以使用视图模型方法将数据从多个视图发送到控制器。这是一个例子： http://rachelappel.com/use-viewmodels-to-manage-data-amp-organize-code-in-asp-net-mvc-applications/

ASP.NET将数据发送到VIEW

2 个答案: