无法将其重定向到AfterLogin页面

如何解决无法将其重定向到AfterLogin页面

UserController.cs

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Login(Customers customer)
        {
            if (ModelState.IsValid)
            {
                    var obj = db.Customers.Where(a => a.Username.Equals(customer.Username) && a.Password.Equals(customer.Password)).FirstOrDefault();
                    if (obj != null)
                    {
                        Session["IC"] = obj.IC.ToString();
                        Session["Username"] = obj.Username.ToString();
                        return RedirectToAction("AfterLogin");
                    }
            }
            return View(customer);
        }

        public ActionResult AfterLogin()
        {
            if (Session["IC"] != null)
            {
                return View();
            }
            else
            {
                return RedirectToAction("Login");
            }
        }

Login.cshtml

@model LeafLife.Models.Customers
@{
    ViewBag.Title = "Login";
    Layout = "~/Views/Shared/_Layout.cshtml";
}


<h2>Login</h2>

@using (Html.BeginForm("Login","User",FormMethod.Post))
{
    <fieldset>
        <legend>Mvc Simple Login Application Demo</legend>

        @Html.AntiForgeryToken()
        @Html.ValidationSummary(true)
        @if (@ViewBag.Message != null)
        {
            <div style="border: 1px solid red">
                @ViewBag.Message
            </div>
        }
        <table>
            <tr>
                <td>@Html.LabelFor(a => a.Username)</td>
                <td>@Html.TextBoxFor(a => a.Username)</td>
                <td>@Html.ValidationMessageFor(a => a.Username)</td>
            </tr>
            <tr>
                <td>@Html.LabelFor(a => a.Password)</td>
                <td>@Html.PasswordFor(a => a.Password)</td>
                <td>@Html.ValidationMessageFor(a => a.Password)</td>
            </tr>
            <tr>
                <td><input type="submit" value="Login" /></td>
            </tr>
        </table>
    </fieldset>
}  

Customers.cs

public class Customers
    {
        [Key]
        public int IC { get; set; }
        [Display(Name = "Username")]
        [Required(AllowEmptyStrings = false,ErrorMessage = "Username required")]
        public string Username { get; set; }
        [Display(Name = "First Name")]
        [Required(AllowEmptyStrings = false,ErrorMessage = "First name required")]
        public string FirstName { get; set; }

        [Display(Name = "Last Name")]
        [Required(AllowEmptyStrings = false,ErrorMessage = "Last name required")]
        public string LastName { get; set; }

        [Display(Name = "Email Address")]
        [Required(AllowEmptyStrings = false,ErrorMessage = "Email Address required")]
        [DataType(DataType.EmailAddress)]
        public string Email { get; set; }

        [Display(Name = "Date of birth")]
        [DataType(DataType.Date)]
        [DisplayFormat(ApplyFormatInEditMode = true,DataFormatString = "{0:MM/dd/yyyy}")]
        public DateTime DateofBirth { get; set; }

        [Required(AllowEmptyStrings = false,ErrorMessage = "Password is required")]
        [DataType(DataType.Password)]
        [MinLength(6,ErrorMessage = "Minimum 6 characters required")]
        public string Password { get; set; }

        [Display(Name = "Confirm Password")]
        [DataType(DataType.Password)]
        [Compare("Password",ErrorMessage = "Confirm password and password do not match")]
        public string ConfirmPassword { get; set; }
        //ForeignKey
        public int MembershipTypesId { get; set; }

        [ForeignKey("MembershipTypesId")]
        public MembershipTypes MembershipTypes { get; set; }
        

    }

我测试了它，在我插入了必填字段之后，它只是停留在登录页面上。 经过多次测试，谷歌浏览器仅弹出一次保存密码通知。我以隐身模式再次测试它不会仅显示“登录”页面而无法登录。我再次尝试在Chrome上浏览，结果还是一样。

解决方法

如评论中所述，ModelState.IsValid返回false，这意味着LeafLife.Models.Customers的某些属性未通过模型验证。

您之所以在登录页面上“卡住”，是因为经过评估后，Login()方法的HttpPost版本看起来像这样：

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Login(Customers customer)
    {
        if (ModelState.IsValid) // value is false so skip this block
        {
            // code here is not executed
        }

        return View(customer); // this shows the Login view
    }

它仅返回登录视图。您需要找到有关ModelState.IsValid返回false的原因的根本原因。查看ModelState.Values，并在集合中进行挖掘以查看是否存在模型错误。

Here's a good article解释了ModelState和模型验证。

编辑： 现在已经添加了Customer模型的代码，我建议使用View Models，而不是直接在View中使用数据模型。以下是一些正确的问题，可为您指明正确的方向：

What is ViewModel in MVC?

What is difference between Model and ViewModel in asp.net core mvc?