.net核心多页表单不在会话中存储数据控制器的动作助手类

问题描述

我有一个3页的表单，我试图将每个页面的数据存储在一个会话对象中，但是我无法弄清楚实现中缺少了什么

如果我在assumes 10000 < sal <= 20000;上放置一个断点，则该对象的数据在表单的每一页上始终为空。

为了创建会话对象，我使用了一个助手来创建复杂类型。

控制器的动作

NewUser newUser = GetNewUser();

助手类

private NewUser GetNewUser()
{
    if (HttpContext.Session.GetobjectFromJson<NewUser>("newUser") == null)
    {
        var obj = new NewUser();
        HttpContext.Session.SetobjectAsJson("newUser",obj);
    }
    return (NewUser)HttpContext.Session.GetobjectFromJson<NewUser>("newUser");
}


[HttpGet("BasicDetails")]
[HttpPost("BasicDetails")]
public IActionResult BasicDetails(BasicDetails basicDetailsModel,string prevBtn,string nextBtn)
{
    if (nextBtn != null)
    {
        if (ModelState.IsValid)
        {
            NewUser newUser = GetNewUser();
            newUser.FirstName = basicDetailsModel.FirstName;
            newUser.LastName = basicDetailsModel.LastName;
            newUser.Email = basicDetailsModel.Email;
            newUser.Password = basicDetailsModel.Password;
            newUser.Phone = basicDetailsModel.Phone;
            newUser.Country = basicDetailsModel.Country;
            newUser.City = basicDetailsModel.City;
            newUser.RecieveCommunication = basicDetailsModel.RecieveCommunication;
            return View("Views/CreateAccount/ferretDetails.cshtml");
        }
    }
    return View("Views/CreateAccount/BasicDetails.cshtml");
}

[HttpGet("ferretDetails")]
[HttpPost("ferretDetails")]
public IActionResult ferretDetails(ferretDetails ferretDetailsModel,string nextBtn)
{
    NewUser newUser = GetNewUser();
    if (prevBtn != null)
    {
        BasicDetails basicDetails = new BasicDetails();
        basicDetails.FirstName = newUser.FirstName;
        basicDetails.LastName = newUser.LastName;
        basicDetails.Email = newUser.Email;
        basicDetails.Password = newUser.Password;
        basicDetails.Phone = newUser.Phone;
        basicDetails.Country = newUser.Country;
        basicDetails.City = newUser.City;
        basicDetails.RecieveCommunication = newUser.RecieveCommunication;
        return View("Views/CreateAccount/BasicDetails.cshtml",basicDetails);
    }

    if (nextBtn != null)
    {
        if (ModelState.IsValid)
        {
            newUser.ferretModel = ferretDetailsModel.ferretModel;
            newUser.ferretSerialNumber = ferretDetailsModel.ferretSerialNumber;
            newUser.PurchasedDate = ferretDetailsModel.PurchasedDate;
            newUser.PurchasedFrom = ferretDetailsModel.PurchasedFrom;
            return View("Views/CreateAccount/AccountType.cshtml");
        }
    }
    return View();
}

[HttpPost("/AccountType")]
public IActionResult AccountType(AccountType accountTypeModel,int accountTypeCheck,string createBtn)
{
    NewUser newUser = GetNewUser();
    if (prevBtn != null)
    {
        ferretDetails ferretDetails = new ferretDetails();
        ferretDetails.ferretModel = newUser.ferretModel;
        ferretDetails.ferretSerialNumber = newUser.ferretSerialNumber;
        ferretDetails.PurchasedDate = newUser.PurchasedDate;
        ferretDetails.PurchasedFrom = newUser.PurchasedFrom;
        return View("Views/CreateAccount/ferretDetails.cshtml",ferretDetails);
    }
    if (createBtn != null)
    {
        if (ModelState.IsValid)
        {

        }
    }
    return View();
}

解决方法

如果我在NewUser上设置一个断点newUser = GetNewUser（）;的数据该对象在表单的每一页上始终为null。

根据您的代码，我创建了一个示例，看来GetNewUser()方法将始终返回新用户，而不会返回null。

由于您将断点放在NewUser newUser = GetNewUser();上，因此可能未执行该语句，因此当您检查值时，它将显示null，如下所示：

执行该语句（尝试按“ F10”或“ F11”键）后，您将获得值：

此外，关于会话价值损失问题，您可以查看以下提示：

参考the Session and state management in ASP.NET Core来配置会话状态（中间件的顺序很重要）：

在ConfigureServices中添加对AddSession的调用。
在“配置”中添加对UseSession的调用。
检查浏览器设置，确保其启用了会话和cookie。
检查会话配置，确保它没有过期。

如果您使用的是asp.net core 2.1或2.2版本，请在Startup类的ConfigureServices方法中尝试设置options.CheckConsentNeeded = context => false;

 services.Configure<CookiePolicyOptions>(options =>
 {
   // This lambda determines whether user consent for non-essential cookies is needed for a given request.
   options.CheckConsentNeeded = context => false;
   options.MinimumSameSitePolicy = SameSiteMode.None;
 });

参考：Session variable value is getting null in ASP.NET Core

修改：

测试步骤：

创建一个新的asp.net核心MVC应用程序，

在Startup.cs类中添加会话：

 public void ConfigureServices(IServiceCollection services)
 { 
     services.AddSession(options =>
     {
         options.IdleTimeout = TimeSpan.FromMinutes(10);
         options.Cookie.HttpOnly = true;
         options.Cookie.IsEssential = true;
     });
     services.AddControllersWithViews();
     services.AddRazorPages();
 }

 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
 public void Configure(IApplicationBuilder app,IWebHostEnvironment env)
 {
     ...

     app.UseSession();
     app.UseEndpoints(endpoints =>
     {
         endpoints.MapControllerRoute(
             name: "default",pattern: "{controller=Home}/{action=Index}/{id?}");
         endpoints.MapRazorPages();
     });
 }

添加SessionExtensions.cs：

公共静态类SessionExtensions { 公共静态无效SetObjectAsJson（此ISession会话，字符串键，对象值） { session.SetString（key，JsonConvert.SerializeObject（value））; }
```
 public static T GetObjectFromJson<T>(this ISession session,string key)
 {
     var value = session.GetString(key);

     return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
 }
```
}
添加一个NewUser类，其中包含两个属性：UserID和UserName。

使用以下代码测试会话：

 public IActionResult Index()
 {
     NewUser newUser = GetNewUser();

     var usename = newUser.UserName;

     if (HttpContext.Session.GetObjectFromJson<NewUser>("TestData") == null)
     {
         var obj = new NewUser() { UserID = 1001,UserName = "Tom" };
         HttpContext.Session.SetObjectAsJson("TestData",obj);
     }
     return View();
 }
 private NewUser GetNewUser()
 {
     if (HttpContext.Session.GetObjectFromJson<NewUser>("newUser") == null)
     {
         var obj = new NewUser() { UserID=1001,UserName="Jack" };
         HttpContext.Session.SetObjectAsJson("newUser",obj);
     }


     return (NewUser)HttpContext.Session.GetObjectFromJson<NewUser>("newUser");
 }

 public IActionResult Privacy()
 {
     NewUser newUser = GetNewUser();
     var usename = newUser.UserName;

     if (HttpContext.Session.GetObjectFromJson<NewUser>("TestData") != null)
     {
         var name = HttpContext.Session.GetObjectFromJson<NewUser>("TestData").UserName;
     }
     return View();
 }

然后，检查调试屏幕截图（我们可以从会话中获取值）：

asp.net-core c#c#session-state

.net核心多页表单不在会话中存储数据 控制器的动作助手类

问题描述

控制器的动作

助手类

解决方法

相关问答

.net核心多页表单不在会话中存储数据控制器的动作助手类