刚使用.NET Core会不习惯，比如如何使用Session；不仅需要引用相应的类库，还需要在Startup.cs里进行注册。
1、在你的项目上基于NuGet添加：
install-package Microsoft.AspNetCore.Session -ver 2.0 install-package Microsoft.AspNetCore.Http.Extensions -ver 2.0
2、在Startup.cs里进行注册
在Startup.cs文件中的ConfigureServices方法中添加：
services.AddSession();在Startup.cs文件中的Configure方法中添加：
app.UseSession();添加后代码如下：
public void ConfigureServices(IServiceCollection services) { services.AddSession(); services.AddMvc(); } 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?}"); }); }3、在MVC Controller里使用HttpContext.Session
从nuget安装Microsoft.AspNetCore.Mvc引用，直接使用自带的方法进行设置和获取session。不过自带的方法设置和获取的session值是byte[]类型的，可以从nuget安装并引用Microsoft.AspNetCore.Http并使用里面的扩展方法。
public class HomeController : Controller { public IActionResult Index() { HttpContext.Session.SetString("code", "123456"); return View(); } public IActionResult About() { ViewBag.Code = HttpContext.Session.GetString("code"); return View(); } } 4、如果不是在Controller里，你可以注入IHttpContextAccessor public class SessionTestClass { private readonly IHttpContextAccessor _httpContextAccessor; private ISession _session => _httpContextAccessor.HttpContext.Session; public SomeOtherClass(IHttpContextAccessor httpContextAccessor) { _httpContextAccessor = httpContextAccessor; } public void Set() { _session.SetString("code", "123456"); } public void Get() { string code = _session.GetString("code"); } }5、Isession的扩展 存储复杂对象
public static class SessionExtensions { public static void SetObjectAsJson(this ISession session, string key, object value) { 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); } }使用范例：
var myTestObject = new MyTestClass(); HttpContext.Session.SetObjectAsJson("SessionTest", myTestObject); var myComplexObject = HttpContext.Session.GetObjectFromJson<MyClass>("SessionTest");转载于:https://www.cnblogs.com/siyunianhua/p/11493485.html
相关资源：.NET Core2.0 MVC 用session，cookie实现的sso单点登录