Question

我正在尝试从数据库中检索数据并将记录写出来，但我收到错误：

An exception of type 'System.NullReferenceException' occurred in App_Web_uaarpxja.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object.

数据库模型 PastaModel.cs

public class Item
{
    [Key]
    public int Itemid { get; set; }
    public string Itemname { get; set; }
    public int Itemprice { get; set; }
    public int Currentstock { get; set; }
    public string Itemtype { get; set; }
    public string pictureURL { get; set; }
}

public class PastaContext : DbContext
{

    public PastaContext()
        : base("name=PastaModel")
    {
        Database.CreateIfNotExists();
    }

    public DbSet<Item> Items { get; set; }


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

}

控制器 ItemController.cs

public class ItemController : Controller
{

    private PastaContext db = new PastaContext();


    public ActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Index()
    {
        return View();
    }

}

查看 Index.cshtml

@model IEnumerable<Oblig1.Models.Item>

<!DOCTYPE html>

<br />
<br />

<html>
<head>
    <title>Index</title>
</head>
<body>


@foreach (var item in Model)
{

     <p>@item.Itemname</p>

}


</body>
</html>

我在此行@foreach (var item in Model) {

中收到此错误

编辑：添加了DbContext

Answer 1

这种情况正在发生，因为您没有在控制器中从您返回视图的位置注入任何内容。

并且您的视图期望来自您的控制器的IEnumerable<Oblig1.Models.Item>，但是当您没有从控制器传递模型时，视图在Model中变为空。

尝试以下代码： -

public ActionResult Index()
    {
        var model = db.Items.ToList(); ////Your model that you want to pass
        return View(model);
    }

使用带有foreach的mvc从数据库中获取数据

1 个答案: