尝试访问模型的嵌入类型的属性

Question

我无法显示嵌入类型的属性。如何在 razor 页面中访问嵌入类型模型（例如 CustomerOrderItem.Meal.Name）的属性？

剃刀页面：

@page
@model RazorPages.Pages.BasketOrder.IndexModel
@{

}
@if (Model.ShowMessage)
{
    <div asp-validation-summary="All" class="alert alert-info">@Model.Message</div>
}
<form method="post">
    <table class="table">
        <thead>
            <tr>
                <th>@Html.DisplayNameFor(m => m.CustomerOrderItems[0].Meal.Name)</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var m in Model.CustomerOrderItems)
            {
            <tr>
                <td>@m.Meal.Name</td>
            </tr>
            }
        </tbody>
    </table>
</form>

在 'Code behind' 文件中，OnGetAsync - 方法获取 CustomerOrderItems。

public class IndexModel : PageModel
{
    private ApplicationDbContext _db;

    private UserManager<ApplicationUser> _userManager;

    public IList<CustomerOrderItem> CustomerOrderItems { get; set; }

    [TempData]
    public string Message { get; set; }

    public bool ShowMessage => !string.IsNullOrEmpty(Message);

    public IndexModel(ApplicationDbContext db, UserManager<ApplicationUser> userManager)
    {
        _db = db;
        _userManager = userManager;
    }

    public async Task OnGetAsync()
    {
        CustomerOrderItems = await _db.CustomerOrderItems.ToListAsync();
    }
}

模型类、CustomOrderItem 引用了 Meal。

public class CustomerOrderItem
{
    public int Id { get; set; }
    public int Status { get; set; }
    public CustomerOrder CustomerOrder { get; set; }
    public Meal Meal { get; set; }
    public ICollection<Extra> Extras { get; set; }
}

public class Meal
{
    public int Id { get; set; }
    public int Status { get; set; }
    public string Name { get; set; }
    public double Price { get; set; }
}

Answer 1

用餐是顾客内心的具体客体。 EF core 2 没有延迟加载，但这不是一个大问题。

您可以使用 eagar 加载:

//With eagerloading DbSet 
  //has method called include. Dont abuse eagerloading slows down db

  CustomerOrderItems = await _db.CustomerOrderItems
.Include(x => x.Meals).ToListAsync();

//also initialize that Collection in your constructor if you want to use it

尝试访问模型的嵌入类型的属性

Trying to access the property of an embedded type of a model

c#

asp.net

razor-pages

尝试访问模型的嵌入类型的 属性

Trying to access the property of an embedded type of a model

c#

asp.net

razor-pages

尝试访问模型的嵌入类型的属性