ASP.NET REPLACING Request.IsAuthenticated与bool是一般的System.NullReferenceException：对象引用未设置为对象的实例

如何解决ASP.NET REPLACING Request.IsAuthenticated与bool是一般的System.NullReferenceException：对象引用未设置为对象的实例

错误：

我想替换 Request.IsAuthenticated ，因为我在标准模板中具有不同的注册和登录方法。我想用一个 bool 代替，我也尝试过用一个 int ，正如您在下面的代码中看到的那样。

这是我的 AccountController.cs 登录方法，我在其中使用bool Authenticated ：

    //GET: Account/LoginTurist (new)
        [HttpGet]
        [AllowAnonymous]
        public ActionResult LoginTurist()
        {
            return View();
        }


        //POST: Account/LoginTurist (new)
         [HttpPost]
        [AllowAnonymous]
        public ActionResult LoginTurist(LoginVM obj)
        {
            bool userExists = db.Users.Any(u => u.Username == obj.Username && u.Password == obj.Password);

            var viewModel = new LoginVM { Authenticated = Request.IsAuthenticated };
            //var viewModel = new LoginVM { Authenticated = 0 };

            if (userExists)
            {
                Session["UseId"] = db.Users.Single(x => x.Username == obj.Username).Id;

                viewModel.Authenticated = true;
                //viewModel.Authenticated = 1;

                return RedirectToAction("Experiences","Home");
            }
            // in case of incorect email or password
            ViewBag.LoginMessage = "Nume utilizator sau parola incorecte!";

            return View(viewModel);
        }

这是模型LoginVM：

namespace TuristWithComments.ViewModels
{
    public class LoginVM
    {

        [Required]
        [Display(Name = "Nume Utilizator")]
        public string Username { get; set; }

        [Required,DataType(DataType.Password)]
        [Display(Name = "Parola")]
        public string Password { get; set; }


        [Display(Name = "Recunoaste dispozitivul?")]
        public bool RememberMe { get; set; }

        public bool Authenticated { get; set; }
        //public int Authenticated { get; set; }
    }
}

这是视图 LoginPartial.cshtml ，在这里我试图像这样替换 Request.IsAuthenticated ：

@*@using Microsoft.AspNet.Identity*@
@*@if (Request.IsAuthenticated)*@


@model TuristWithComments.ViewModels.LoginVM
@if (Model.Authenticated)


{
    using (Html.BeginForm("LogOff","Account",FormMethod.Post,new { id = "logoutForm",@class = "navbar-right" }))
    {
        @Html.AntiForgeryToken()

        <ul class="nav navbar-nav navbar-right">
            <li>
                @*@Html.ActionLink("Hello " + User.Identity.GetUserName() + "!","Index","Manage",routeValues: null,htmlAttributes: new { title = "Manage" })*@
            </li>
            <li><a href="javascript:document.getElementById('logoutForm').submit()">Log off</a></li>
        </ul>
    }
}
else
{
    <ul class="nav navbar-nav navbar-right">
        @*<li>@Html.ActionLink("Inregistrare","Register",htmlAttributes: new { id = "registerLink" })</li>*@
        @*<li>@Html.ActionLink("Autentificare","Login",htmlAttributes: new { id = "loginLink" })</li>*@
        <li>@Html.ActionLink("Inregistrare","RegisterTurist",htmlAttributes: new { id = "registerLink" })</li>
        <li>@Html.ActionLink("Autentificare","LoginTurist",htmlAttributes: new { id = "loginLink" })</li>
    </ul>
}

我可以理解 Model.Authenticated 为空（请参见第一张图片），但是我在哪里可以解决这个问题？ Request.IsAuthenticated 开头为 false ，这就是程序在启动时运行的原因。如何修复模型不为空？

或者也许有更好的，不同的方式来更改导航栏，您会以另一种方式来做吗？

以后的修改： 在网上搜索更多答案后，我看到很多关于“ Web.config”的提及，但我没有做任何修改，看起来像这样：

<system.web>
    <authentication mode="None" />
    <compilation debug="true" targetFramework="4.5.2" />
    <httpRuntime targetFramework="4.5.2" />
  </system.web>

这可能是关键吗？也许我需要在这里修改一些内容？

稍后编辑2 ，在David发表评论后： LoginPartial视图是NavigationBar的一部分，它位于默认布局（或主布局，如果可以的话）中，在该布局中所有页面都呈现出来，并且理论上是运行项目时打开的第一件事，不是吗！这是“布局”页面：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>@ViewBag.Title</title>
    @Styles.Render("~/Content/css")
    @Scripts.Render("~/bundles/modernizr")

    <!--Lightbox for popup images-->
    <link href="~/Content/lightbox.css" rel="stylesheet" />

</head>

<body>

    <div class="navbar navbar-inverse navbar-fixed-top">
        <div class="container">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                @Html.ActionLink(" ","Home",new { area = "" },new { @class = "navbar-brand" })
            </div>
            <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <li>@Html.ActionLink("Acasa","Home")</li>
                    <li>@Html.ActionLink("Recomandarile noastre","Recommendations","Home")</li>
                    <li>@Html.ActionLink("Experientele utilizatorilor","Experiences","Home")</li>
                    <li>@Html.ActionLink("Fii spontan!","Spontaneous","Home")</li>
                    <li>@Html.ActionLink("Contacteaza-ne","Contact","Home")</li>
                    <li>@Html.ActionLink("Despre noi","About","Home")</li>
                </ul>
                @Html.Partial("_LoginPartial")      // <-- here it is
            </div>
        </div>
    </div>

    <div style="padding: 7px">
        <img src="~/Content/Images/_banner7.png" class="img-responsive" />
    </div>

    <div class="panel panel-body">
        <div class="col-md-2"> 

            <!--Partial view for the sidemenu-->
            @Html.Partial("_SideMenu")

        </div>

        <div class="col-md-10">

            <div>
                @RenderBody()
            </div>

        </div>
    </div>
    @*<hr />*@
    <div class="container body-content">
        <footer>
            <p>&copy; @DateTime.Now.Year - TuristWithComments in Banat by Ionut Guruian</p>
        </footer>
    </div>



    @Scripts.Render("~/bundles/jquery")
    @Scripts.Render("~/bundles/bootstrap")
    @RenderSection("scripts",false)

    <!--Lightbox for popup images-->
    <script src="~/Scripts/lightbox-2.6.js"></script>
</body>
</html>

此外，该操作确实具有GET，我在第一个代码段中也添加了该功能。

用户将其凭据用于登录的LoginTurist.cshtml就是这里：

@using TuristWithComments.Models

@model TuristWithComments.ViewModels.LoginVM
@*@model LoginViewModel*@


@{
    ViewBag.Title = "Autentificare";
}

<h2>@ViewBag.Title.</h2>

<div class="row">
    <div class="col-md-8">
        <section id="loginForm">

            @using (Html.BeginForm("LoginTurist",new { ReturnUrl = ViewBag.ReturnUrl },new { @class = "form-horizontal",role = "form" }))
            {
                @Html.AntiForgeryToken()
                <h4>Autentificare</h4>
                <hr />
                @Html.ValidationSummary(true,"",new { @class = "text-danger" })
                <div class="form-group">
                    @Html.LabelFor(model => model.Username,htmlAttributes: new { @class = "control-label col-md-2" })
                    <div class="col-md-10">
                        @Html.EditorFor(model => model.Username,new { htmlAttributes = new { @class = "form-control" } })
                        @Html.ValidationMessageFor(model => model.Username,new { @class = "text-danger" })
                    </div>
                </div>

                <div class="form-group">
                    @Html.LabelFor(model => model.Password,htmlAttributes: new { @class = "control-label col-md-2" })
                    <div class="col-md-10">
                        @Html.EditorFor(model => model.Password,new { htmlAttributes = new { @class = "form-control" } })
                        @Html.ValidationMessageFor(model => model.Password,new { @class = "text-danger" })
                    </div>
                </div>


               @*<div class="form-group">
                        <div class="col-md-offset-2 col-md-10">
                            <div class="checkbox">
                                @Html.CheckBoxFor(m => m.RememberMe)
                                @Html.LabelFor(m => m.RememberMe)
                            </div>
                        </div>
                    </div>*@

                <h5 class="text-danger" style="padding-left:20%">@ViewBag.LoginMessage</h5>

                
             
                <div class="form-group">
                    <div class="col-md-offset-2 col-md-10">
                        <input type="submit" value="Autentificare" class="btn btn-success" />
                    </div>
                </div>
                <p>
                    @Html.ActionLink("Inregistrare cont nou","RegisterTurist")
                </p>
            }
        </section>
    </div>
    <div class="col-md-4">
        <section id="socialLoginForm">
            @Html.Partial("_ExternalLoginsListPartial",new ExternalLoginListViewModel { ReturnUrl = ViewBag.ReturnUrl })
        </section>
    </div>
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

解决方法

这似乎与Authenticated属性无关。 Model是null。因为您没有为视图提供模型：

return View();

应为：

return View(viewModel);

ASP.NET REPLACING Request.IsAuthenticated与bool是一般的System.NullReferenceException：对象引用未设置为对象的实例

如何解决ASP.NET REPLACING Request.IsAuthenticated与bool是一般的System.NullReferenceException：对象引用未设置为对象的实例

解决方法

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