Question

我有一个非常简单的ASP.NET MVC（5.2.4.0）应用程序，代码如下。将表单发布到 [HttpPost] 方法时，我找不到 model.Addresses 为空的原因。有人可以帮帮我吗？对于我所看到的，我的代码与StackOverflow上类似问题的答案相匹配。

HomeController.cs

namespace WebApplication2.Controllers {

    public class IndexViewModel {

    public string Name { get; set; }

        public List<Address> Addresses;

        public IndexViewModel()
        {
            Addresses = new List<Address>();
        }
    }

    public class Address
    {
        public string Name { get; set; }

        public string Id { get; set; }
    }

    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            var model = new IndexViewModel();

            model.Addresses = new List<Address>();
            model.Addresses.Add(new Address() { Id = "1", Name = "A1" });
            model.Addresses.Add(new Address() { Id = "2", Name = "A2" });

            return View(model);
        }

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

Index.cshml：

@model WebApplication2.Controllers.IndexViewModel
@{
    ViewBag.Title = "Home Page";
}

@using (Html.BeginForm("Index", "Home"))
{

    @Html.EditorFor(m => m.Name)

    for (var i = 0; i < Model.Addresses.Count; i++)
    {
        @Html.TextBoxFor(m => Model.Addresses[i].Name)
        @Html.HiddenFor(m => Model.Addresses[i].Id)
    }

    <input type="submit" value="Ok" />
}

Answer 1

正如Tetsuya Yamamoto在上面的评论中提到的，该错误是由于Addresses是公共字段而不是属性。

 public List<Address> Addresses;

应更改为

 public List<Address> Addresses { get; set; }

Answer 2

请声明地址为以下属性，因为您将其声明为公共字段而不是属性，因此它无法保存您分配的值。

 public List<Address> Addresses{get;set;};

为什么列表没有绑定？

2 个答案: