POST方法返回空值

Question

我正在尝试使用表单和POST方法将视图中的客户列表发送到控制器。但是，控制器中的模型为空。

这是我的ViewModel：

 public class CustomerViewModel
{
    public List<Customer> Customers { get; set; }
}

这是视图：

@model CustomerViewModel

@{
ViewData["Title"] = "Index";
}

<h2>Index</h2>

<p>
    <a asp-action="Create">Create New</a>
</p>
@Html.BeginForm("SendSMS", "Customers", FormMethod.Post)
{
<table class="table">
    <thead>
        <tr>

            <th></th>
        </tr>
    </thead>
    <tbody>

        @foreach (var item in Model.Customers)
        {

        <tr>

            <td>
                @Html.EditorFor(modelItem => item.IsSelected)
                @Html.HiddenFor(modelItem => item.Email)
                @Html.HiddenFor(modelItem => item.FirstName)
                @Html.HiddenFor(modelItem => item.LastName)
                @Html.HiddenFor(modelItem => item.PhoneNumber)
                @Html.HiddenFor(modelItem => item.ID)
            </td>


            <td>
                @Html.DisplayFor(modelItem => item.FirstName)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.LastName)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.PhoneNumber)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Email)
            </td>
            <td>
                <a asp-action="Edit" asp-route-id="@item.ID">Edit</a> |
                <a asp-action="Details" asp-route-id="@item.ID">Details</a> |
                <a asp-action="Delete" asp-route-id="@item.ID">Delete</a> |
                <a asp-action="Message" asp-route-id="@item.ID">Message</a>
            </td>


        </tr>
        }
    </tbody>

</table>
<input type="submit" value="Save" />
}

这是控制器动作：

[HttpPost]
    public IActionResult SendSMS(CustomerViewModel model)
    {
        StringBuilder sb = new StringBuilder();

        var customers = model.Customers;

        foreach (var i in customers)

        {
            if (i.IsSelected)
            {
                sb.Append(i.Email + ",");
            }
        }

        ViewBag.Data = sb.ToString();

        return View(model);
    }

我收到一个运行时错误消息，指出模型.SendSMS ActionResult中的客户为空。

任何帮助将不胜感激。