无法访问我的Asp.Net Core项目中的帮助器类内的Session对象 [英] Cannot access Session object inside a helper class within my Asp.Net Core project

问题描述

我正在尝试访问ASP.NET Core 2.1项目内的帮助器类中的HttpContext.Session对象.

I am trying to access the HttpContext.Session object in a helper class within my ASP.NET Core 2.1 project.

当我尝试访问HttpContext.Session时，出现以下错误.

When I try to access HttpContext.Session I get the following error.

CS0120非静态字段，方法或属性'HttpContext.Session'需要对象引用

CS0120 An object reference is required for the non-static field, method, or property 'HttpContext.Session'

使用.NET 4.x ASP.NET，可以使用"HttpContext.Current.Session"轻松访问它.

With .NET 4.x ASP.NET, it was easily accessed with "HttpContext.Current.Session".

这是我的课程:

 public class MySession
 {

    public void Foo()
    {
        HttpContext.Session.SetString("Name", "The Doctor"); // will not work
        HttpContext.Session.SetInt32("Age", 773);  // will not work

    }
 }

这是我的Startup.cs:

Here is my Startup.cs:

    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDistributedMemoryCache();

            services.AddSession(options =>
            {
                // Set a short timeout for easy testing.
                options.IdleTimeout = System.TimeSpan.FromMinutes(30);
                options.Cookie.HttpOnly = true;
            });

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            // In production, the Angular files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/dist";
            });

            services.Configure<ServiceSettings>(Configuration.GetSection("ServiceSettings"));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }

            app.UseSession();
            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseSpaStaticFiles();

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

            app.UseSpa(spa =>
            {
                // To learn more about options for serving an Angular SPA from ASP.NET Core,
                // see https://go.microsoft.com/fwlink/?linkid=864501

                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.UseAngularCliServer(npmScript: "start");
                }
            });
        }
    }

我需要向MySession类中注入一些东西吗?

Do I need to inject something into the MySession class?

推荐答案

您仍然可以通过HttpContext访问Session.顾名思义，您将必须通过IHttpContextAccessor访问会话，这将允许访问控制器和其他将其作为本地成员的框架类外部的HttpContext.

You can still access Session via the HttpContext. You how ever have to access the session via the IHttpContextAccessor, which as the name implies, will allow access to the HttpContext external to controllers and other framework classes that have it as a local member.

首先，您需要将访问器添加到DI容器中.

First you need to add the accessor to the DI container.

services.AddHttpContextAccessor();

API参考

您需要从那里将其注入所需的类并访问所需的成员

from there you need to inject it into the desired class and access the desired members

public class MySession {
    IHttpContextAccessor accessor;

    public MySession(IHttpContextAccessor accessor) {
        this.accessor = accessor;
    }

    public void Foo() {
        var httpContext = accessor.HttpContext;
        httpContext.Session.SetString("Name", "The Doctor");
        httpContext.Session.SetInt32("Age", 773);
    }
}

这篇关于无法访问我的Asp.Net Core项目中的帮助器类内的Session对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！