c# - MVC 4. ModelState.IsValid 总是返回 true

Question

我不明白为什么 ModelState.isValid 在所有方面都给我。我在电子邮件中设置了一些返回 true 的东西，然后我输入空字段，它也返回 true。我的问题是，当字段为空且我写电子邮件时没有任何内容时，我必须做什么才能返回 true？

我有下一个 View 文件:

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <div style="padding-top:5px;clear:both;"></div>
    <% using (Html.BeginForm()) { %>
        <%: Html.ValidationSummary(true) %>   
        <fieldset>
                <legend>Email usuario</legend>

                <div class="editor-field">
                    <%: Html.TextBoxFor(m => m.Email) %>
                    <%: Html.ValidationMessageFor(m => m.Email) %>
                </div>

                <input type="submit" value="Enviar Email" />
        </fieldset>
    <% } %>
    <div style="padding-top:5px;clear:both;"></div>
</asp:Content>

Controller 是:

//
// GET: /Account/EmailRequest
public ActionResult EmailRequest()
{
    return View();
}

[HttpPost]
public ActionResult EmailRequest(string email)
{
    if (ModelState.IsValid)
    {
        // save to db, for instance
        return RedirectToAction("AnotherAction");
    }
    return View();
}

我的模型类是:

    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    using System.Globalization;
    using System.Web.Mvc;
    using System.Web.Security;

namespace PortalClient.Models
{
    public class EmailRequest
    {

        [Required(ErrorMessage = "required")]
        public string Email { get; set; }
    }
}

Answer 1

将 post 操作的签名从 string email 更改为 EmailRequest model，然后检查状态。例如

[HttpPost]
public ActionResult EmailRequest(EmailRequest model)
{
    if (ModelState.IsValid)
    {
        // save to db, for instance
        return RedirectToAction("AnotherAction");
    }
    return View();
}