無法訪問會話 asp.net 核心

Question

嗨，請幫助我嘗試在 asp.net core 中測試會話，但是當我設置會話並從其他控制器獲取它時，它似乎為空

這是我的創業公司

public class Startup
{

    public IConfigurationRoot Configuration { get; }
    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(env.ContentRootPath)
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
            .AddEnvironmentVariables();
        Configuration = builder.Build();
    }


    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        // Add framework services.
        services.AddMvc().AddJsonOptions(options => {
            options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        });

        // Adds a default in-memory implementation of IDistributedCache.
        services.AddDistributedMemoryCache();

        services.AddSession(options =>
        {
            // Set a short timeout for easy testing.
            options.IdleTimeout = TimeSpan.FromSeconds(600);
            options.CookieHttpOnly = true;
        });


        services.AddSingleton<IConfiguration>(Configuration);
        services.AddSingleton<Microsoft.AspNetCore.Http.IHttpContextAccessor, Microsoft.AspNetCore.Http.HttpContextAccessor>();
        services.AddTransient<IApiHelper, ApiHelper>();



    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        app.UseSession();
        app.UseDeveloperExceptionPage();
        if (env.IsDevelopment())
        {
            app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions {
                HotModuleReplacement = true,
                ReactHotModuleReplacement = true
            });
        }

        //var connectionString = Configuration.GetSection("ConnectionStrings").GetSection("ClientConnection").Value;


        app.UseStaticFiles();
        loggerFactory.AddConsole();


        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
            routes.MapSpaFallbackRoute(
                name: "spa-fallback",
                defaults: new { controller = "Home", action = "Index" });
        });
    }

    public static void Main(string[] args) {
        var host = new WebHostBuilder()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseKestrel()
            .UseStartup<Startup>()
            .Build();

        host.Run();
    }
}

這是我如何設置會話

public class HomeController : Controller
{
    public IActionResult Index()
    {

        HttpContext.Session.SetString("Test", "Ben Rules!");

        return View();
    }

    public IActionResult Error()
    {
        return View();
    }
}

這里是我再次獲取會話的示例代碼，但它似乎為空

    [HttpGet("[action]")]
    public IEnumerable<JobDescription> GetJobDefinitions()
    {
        //this is always null
        var xd = HttpContext.Session.GetString("Test");


        var x = _apiHelper.SendRequest<Boolean>($"api/JobRequest/GetJobRequest",null);
        var returnValue = new List<JobDescription>();
        returnValue = jobDescriptionManager.GetJobDescriptions();
        return returnValue;


    }

感謝您的幫助

Answer 1

對於VS2017 ，請遵循有關ASP.NET Core 中的會話和應用程序狀態的MSDN 官方文章。 您可以在我創建的以下示例中測試您的場景。 注意：雖然下面的代碼看起來很長，但實際上，您只會對從默認 ASP.NET Core 模板創建的默認應用程序進行一些細微的更改。 只需按照以下步驟操作：

使用VS2017默認模板創建 ASP.NET Core MVC 應用程序
修改默認的Home controller如下圖
確保Startup.cs文件具有會話相關條目，如下面的Startup.cs文件所示
運行應用程序並單擊頂部欄上的Home鏈接。 這將存儲如下所示的會話值（ Nam Wam 2017和current date ）
單擊頂部欄上的“ About鏈接。 您會注意到會話值已傳遞給About控制器。 但是我知道這不是您的問題，因為這僅測試將會話值傳遞給same控制器上的另一個操作。 因此，要回答您的問題，請按照接下來的 3 個步驟操作。
創建另一個控制器AnotherController - 如下所示 - 在Views\\Test文件夾中使用新操作Test()和 View Test.cshtml
在_Layout.cshtml添加另一個鏈接<li><a asp-area="" asp-controller="Another" asp-action="Test">Test View</a></li>右后<li>...Contact...</li>鏈接如下圖
再次運行該應用程序並首先單擊頂部欄上的Home鏈接。 然后單擊頂部欄上的Test鏈接。 您會注意到會話值從HomController傳遞到AnotherController並成功顯示在Test視圖上。

家庭控制器：

using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;

namespace MyProject.Controllers
{
    public class HomeController : Controller
    {
        const string SessionKeyName = "_Name";
        const string SessionKeyFY = "_FY";
        const string SessionKeyDate = "_Date";

        public IActionResult Index()
        {
            HttpContext.Session.SetString(SessionKeyName, "Nam Wam");
            HttpContext.Session.SetInt32(SessionKeyFY , 2017);
            // Requires you add the Set extension method mentioned in the SessionExtensions static class.
            HttpContext.Session.Set<DateTime>(SessionKeyDate, DateTime.Now);

            return View();
        }

        public IActionResult About()
        {
            ViewBag.Name = HttpContext.Session.GetString(SessionKeyName);
            ViewBag.FY = HttpContext.Session.GetInt32(SessionKeyFY);
            ViewBag.Date = HttpContext.Session.Get<DateTime>(SessionKeyDate);

            ViewData["Message"] = "Session State In Asp.Net Core 1.1";

            return View();
        }

        public IActionResult Contact()
        {
            ViewData["Message"] = "Contact Details";

            return View();
        }

        public IActionResult Error()
        {
            return View();
        }

    }

    public static class SessionExtensions
    {
        public static void Set<T>(this ISession session, string key, T value)
        {
            session.SetString(key, JsonConvert.SerializeObject(value));
        }

        public static T Get<T>(this ISession session, string key)
        {
            var value = session.GetString(key);
            return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
        }
    }
}

About.cshtml [顯示來自same控制器的會話變量值]

@{
    ViewData["Title"] = "ASP.Net Core !!";
}
<h2>@ViewData["Title"].</h2>
<h3>@ViewData["Message"]</h3>


<table class="table table-responsive">
    <tr>
        <th>Name</th>
        <th>Fiscal Year</th>
    </tr>
    <tr>
        <td>@ViewBag.Name</td>
        <td>@ViewBag.FY</td>
    </tr>
</table>

<label>Date : @(ViewBag.Date.ToString("dd/MM/yyyy") != "01/01/0001" ? ViewBag.Date.ToString("dd/MM/yyyy") : "")</label>

AnotherController [A不同的控制器比HomeController中]：

using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

public class AnotherController : Controller
{
    const string SessionKeyName = "_Name";
    const string SessionKeyFY = "_FY";
    const string SessionKeyDate = "_Date";

    // GET: /<controller>/
    public IActionResult Test()
    {
        ViewBag.Name = HttpContext.Session.GetString(SessionKeyName);
        ViewBag.FY = HttpContext.Session.GetInt32(SessionKeyFY);
        ViewBag.Date = HttpContext.Session.Get<DateTime>(SessionKeyDate);

        ViewData["Message"] = "Session State passed to different controller";
        return View();
    }
}

Test.cshtml : [顯示從主控制器傳遞到Another控制器的會話變量值]

@{
    ViewData["Title"] = "View sent from AnotherController";
}
<h2>@ViewData["Title"].</h2>
<h3>@ViewData["Message"]</h3>


<table class="table table-responsive">
    <tr>
        <th>Test-Name</th>
        <th>Test-FY</th>
    </tr>
    <tr>
        <td>@ViewBag.Name</td>
        <td>@ViewBag.FY</td>
    </tr>
</table>

<label>Date : @(ViewBag.Date.ToString("dd/MM/yyyy") != "01/01/0001" ? ViewBag.Date.ToString("dd/MM/yyyy") : "")</label>

_Layout.cshtml ：

....
            <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <li><a asp-area="" asp-controller="Home" asp-action="Index">Home</a></li>
                    <li><a asp-area="" asp-controller="Home" asp-action="About">About</a></li>
                    <li><a asp-area="" asp-controller="Home" asp-action="Contact">Contact</a></li>
                    <li><a asp-area="" asp-controller="Another" asp-action="Test">Test View</a></li>
                </ul>
            </div>
....

Startup.cs ：[確保您包含一些與會話相關的條目。 很可能當您在 VS2017 中創建 ASP.NET Core MVC 應用程序時，這些條目已經存在。 但請確保。]

....
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    //In-Memory
    services.AddDistributedMemoryCache();
    services.AddSession(options => {
        options.IdleTimeout = TimeSpan.FromMinutes(1);//Session Timeout.
    });              
    // Add framework services.
    services.AddMvc();
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
        app.UseBrowserLink();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
    }

    app.UseStaticFiles();

    app.UseSession();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}
....

Answer 2

要在您的 MVC 應用程序中使用 Session，您必須：安裝Microsoft.AspNetCore.Session NuGet 包。

在Startup.cs ConfigureServices添加AddSession() ：

services.AddMvc();
services.AddSession(options => {
         options.IdleTimeout = TimeSpan.FromHours(1);
});

在Startup.cs配置中添加UseSession() ：

app.UseSession();
app.UseMvc();

現在你可以在控制器中使用它：

設置會話

string token="xx";    
HttpContext.Session.SetString("UserToken", token);

獲取存儲值

var token = HttpContext.Session.GetString("UserToken");

此外，ASP.NET Core 2.1+ 引入了一些額外的擴展點，如 cookie 同意對話框。 因此，我們需要同意存儲用戶的 cookie。

如果單擊隱私橫幅上的“接受”，則 ASP.NET Core 能夠寫入會話 cookie。

無法訪問會話 asp.net 核心

問題描述

2 個解決方案

解決方案1
2 2017-06-30 17:08:08

解決方案2
1 2019-06-22 02:51:14

無法訪問會話 asp.net 核心

問題描述

2 個解決方案

解決方案1 2 2017-06-30 17:08:08

解決方案2 1 2019-06-22 02:51:14

解決方案1
2 2017-06-30 17:08:08

解決方案2
1 2019-06-22 02:51:14