Question

首先，我需要知道如何从数据库中获取一些如何使用URL {id}作为我需要的值来查询我的数据库中的TripId。一旦我有了，我就需要将它传递给视图。

在我的控制器中，我正在寻找三脚架价值＆＃39; 1＆＃39;只是为了看看我是否可以在我的视图中显示。但我希望这是我将有一个更复杂的查询

非常感谢任何帮助！

这是控制器

public class TripsController : Controller
{
    private ApplicationDbContext _db = new ApplicationDbContext();

    ActionResult View(int id)
    {
        using (ApplicationDbContext _db = new ApplicationDbContext())
        {

            var trip = (from Trips in _db.Trips
                         where Trips.TripId.Equals('1')
                         select Trips.TripId);
            if (trip == null)
            {
                return HttpNotFound();
            } else
            {
                /// Code to display page?
            }

        }
    }
}

这是我的模特

public class Trips
{
    [Key]
    [DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity)]
    public int TripId { get; set; }

    public string Country { get; set; }

    public string City { get; set; }

    public string Description { get; set; }

    public int Price { get; set; }

    public DateTime Date { get; set; }

    public int CoachId { get; set; }

}

}

最后是观点..

@model _MVCCoachTravelling.Models.Trips
 @{
ViewBag.Title = "View";

}

<div class="main-container">

<div class="row">

      <img class="img-responsive" src="http://placehold.it/800x300" alt="">
            <div class="caption-full">
                <h4 class="pull-right">£@Html.DisplayFor(model => model.Price)</h4>
                <h4>
                    @Html.DisplayFor(model => model.City)
                </h4>
                <p>@Html.DisplayFor(model => model.Description)</p>

                </div>

Answer 1

如果查询失败，那是因为您要将char与int进行比较

where Trips.TripId.Equals('1')

你应该比较

where Trips.TripId == 1

一旦您结束旅行，现在return View(trip)。

public ActionResult ViewTrip(int id)
{
    using (ApplicationDbContext db = new ApplicationDbContext())
    {
        var query = from t in db.Trips
                    where t.TripId == id
                    select t;

        var trip = query.FirstOrDefault();

        if (trip == null) { /* fail */ }

        return View(trip);
    }
}

Answer 2

您可以尝试：

ActionResult View(int id)
{
    using (ApplicationDbContext _db = new ApplicationDbContext())
    {
        var trip = (from Trips in _db.Trips where Trips.TripId.Equals('1') select Trips.TripId);

        if (trip == null)
            return HttpNotFound();

        return View()
    }
}

如果您的视图已正确映射到控制器和模型。

如何在控制器中获取数据并将其传递给视图？

2 个答案: