ASP.NET MVC; IEnumerable<Model>

我为我的开发类构建了一个小型MailApplication，这是一项家庭作业，但我似乎无法解决这个错误。我基于模型（Mail）生成了一个新的控制器（MailController）。一切都很好，邮件正在发送，但当我return View("Index", mailModel);时，我在提交url/mail/Create（POST）表单时收到一个错误。

The model item passed into the dictionary is of type 'WebApplication1.Models.Mail', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[WebApplication1.Models.Mail]'. 

以下是MailController的创建方法：

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ViewResult Create([Bind(Include = "ID,From,To,Subject,Body")] Mail mail, Models.Mail mailModel)
        {
            if (ModelState.IsValid)
            {
                //Create mail
                MailMessage message = new MailMessage();
                message.To.Add(mailModel.To);
                message.From = new MailAddress(mailModel.From);
                message.Subject = mailModel.Subject;
                message.Body = mailModel.Body;
                message.IsBodyHtml = true;
                //Setup host
                SmtpClient smtp = new SmtpClient();
                smtp.Host = "smtp.gmail.com";
                smtp.Port = 587;
                smtp.UseDefaultCredentials = false;
                smtp.Credentials = new System.Net.NetworkCredential("something@gmail.com", "password!");
                smtp.EnableSsl = true;
                //Send the EMail
                smtp.Send(message);
                return View("Index", mailModel);
            }
            else
            {
                return View(mailModel);
            }
        }

以下是我的型号：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebApplication1.Models
{
    public class Mail
    {
        public int ID { get; set; }
        public string From { get; set; }
        public string To { get; set; }
        public string Subject { get; set; }
        public string Body { get; set; }
    }
}

最后一件事，我的观点：

@model IEnumerable<WebApplication1.Models.Mail>
@{
    ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.From)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.To)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Subject)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Body)
        </th>
        <th></th>
    </tr>
@foreach (var item in ViewData.Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.From)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.To)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Subject)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Body)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.ID }) |
            @Html.ActionLink("Details", "Details", new { id=item.ID }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.ID })
        </td>
    </tr>
}
</table>