asp.net-mvc – 查看模型IEnumerable <>属性返回null(不绑

发布时间：2020-12-15 22:22:18 所属栏目：asp.Net 来源：网络整理

导读：我有一个视图模型,它包含一个产品类类型和一个IEnumerable产品类型.在发布后,第一级产品对象从视图模型返回绑定,而产品枚举将返回null. 为什么IEnumerable选取产品属性没有被绑定到我的视图模型的每个帖子？谢谢！楷模： public class Product{ public int

我有一个视图模型,它包含一个产品类类型和一个IEnumerable&产品>类型.在发布后,第一级产品对象从视图模型返回绑定,而产品枚举将返回null.

为什么IEnumerable<选取产品>属性没有被绑定到我的视图模型的每个帖子？谢谢！楷模：

public class Product
{
    public int ID { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }
}

public class ProductIndexViewModel
{
    public Product NewProduct { get; set; }
    public IEnumerable<Product> Products { get; set; }
}

public class BoringStoreContext 
{
        public BoringStoreContext()
         {
             Products = new List<Product>();
             Products.Add(new Product() { ID = 1,Name = "Sure",Price = (decimal)(1.10) });
             Products.Add(new Product() { ID = 2,Name = "Sure2",Price = (decimal)(2.10) });
         }
         public List<Product> Products {get; set;}
}

视图：

@model ProductIndexViewModel

@using (@Html.BeginForm())
{
    <div>
        @Html.LabelFor(model => model.NewProduct.Name)
        @Html.EditorFor(model => model.NewProduct.Name)
    </div>
    <div>
        @Html.LabelFor(model => model.NewProduct.Price)
        @Html.EditorFor(model => model.NewProduct.Price)
    </div>
    <div>
        <input type="submit" value="Add Product" />
    </div>

        foreach (var item in Model.Products)
        { 
         <div>
        @Html.LabelFor(model => item.ID)
        @Html.EditorFor(model => item.ID)
    </div>
    <div>
        @Html.LabelFor(model => item.Name)
        @Html.EditorFor(model => item.Name)
    </div>
    <div>
        @Html.LabelFor(model => item.Price)
        @Html.EditorFor(model => item.Price)
    </div>

        }
       }

控制器：

public class HomeController : Controller
{
    BoringStoreContext db = new BoringStoreContext();

    public ActionResult Index()
    {
        ProductIndexViewModel viewModel = new ProductIndexViewModel
        {
            NewProduct = new Product(),Products = db.Products
        };
        return View(viewModel);
    }

    [HttpPost]
    public ActionResult Index(ProductIndexViewModel viewModel)
    {
        // ???? viewModel.Products is NULL here
        // ???? viewModel.NewProduct comes back fine

        return View();
    }

解决方法

你没有正确使用你的lambda表达式.您需要通过模型访问“产品”列表.尝试这样做：

@count = 0
foreach (var item in Model.Products)
    { 
     <div>
    @Html.LabelFor(model => model.Products[count].ID)
    @Html.EditorFor(model => model.Products[count].ID)
</div>
<div>
    @Html.LabelFor(model => model.Products[count].Name)
    @Html.EditorFor(model => model.Products[count].Name)
</div>
<div>
    @Html.LabelFor(model => model.Products[count].Price)
    @Html.EditorFor(model => model.Products[count].Price)
</div>
@count++
    }

编辑

控制器：

BoringStoreContext db = new BoringStoreContext();

    public ActionResult Index()
    {
        ProductIndexViewModel viewModel = new ProductIndexViewModel
        {
            NewProduct = new Product(),Products = db.Products
        };
        return View(viewModel);
    }

    [HttpPost]
    public ActionResult Index(ProductIndexViewModel viewModel)
    {
        // work with view model

        return View();
    }

模型

public class Product
{
    public int ID { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }
}

public class ProductIndexViewModel
{
    public Product NewProduct { get; set; }
    public List<Product> Products { get; set; }
}

public class BoringStoreContext
{
    public BoringStoreContext()
    {
        Products = new List<Product>();
        Products.Add(new Product() { ID = 1,Price = (decimal)(1.10) });
        Products.Add(new Product() { ID = 2,Price = (decimal)(2.10) });
    }
    public List<Product> Products { get; set; }
}

视图：

@model Models.ProductIndexViewModel


@using (@Html.BeginForm())
{
<div>
    @Html.LabelFor(model => model.NewProduct.Name)
    @Html.EditorFor(model => model.NewProduct.Name)
</div>
<div>
    @Html.LabelFor(model => model.NewProduct.Price)
    @Html.EditorFor(model => model.NewProduct.Price)
</div>


for (int count = 0; count < Model.Products.Count; count++ )
{ 
    <div>
    @Html.LabelFor(model => model.Products[count].ID)
    @Html.EditorFor(model => model.Products[count].ID)
    </div>
    <div>
    @Html.LabelFor(model => model.Products[count].Name)
    @Html.EditorFor(model => model.Products[count].Name)
    </div>
    <div>
    @Html.LabelFor(model => model.Products[count].Price)
    @Html.EditorFor(model => model.Products[count].Price)
    </div>
}

<div>
    <input type="submit" value="Add Product" />
</div>
}

（编辑：李大同）

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asp.net-mvc – 查看模型IEnumerable &lt;&gt;属性返回null(不绑

解决方法

asp.net-mvc – 查看模型IEnumerable <>属性返回null(不绑