app.Run(async (context,next) =>
    {
      await context.Response.WriteAsync("environment " + env);
      await next();
    });

public class Greeter : IGreeter
{
  public string Greet()
  {
    return "Hello from Greeter!";
  }
}

public interface IGreeter
{
  string Greet();
}

public void ConfigureServices(IServiceCollection services)
{
  services.AddTransient<IGreeter, Greeter>();
}

app.Use(async (ctx, next) =>
  {
    IGreeter greeter = ctx.RequestServices.GetService<IGreeter>();
    await ctx.Response.WriteAsync(greeter.Greet());
    await next();
  });

public class MyMiddleware
{
  private readonly RequestDelegate _next;
  private readonly IGreeter _greeter;

  public MyMiddleware(RequestDelegate next, IGreeter greeter)
  {
    _next = next;
    greeter = greeter;
  }

  public async Task Invoke(HttpContext context)
  {
    await context.Response.WriteAsync(_greeter.Greet());
    await _next(context);
  }
}

public async Task Invoke(HttpContext context, IGreeter greeter)
{
  await context.Response.WriteAsync(greeter.Greet());
  await _next(context);
}

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using System;

public class Startup
{
  public void ConfigureServices(IServiceCollection services)
  {
    services.AddMvc();

    // 添加一个内存缓存
    services.AddDistributedMemoryCache();

    services.AddSession(options =>
    {
      // 设置10秒钟Session过期来测试
      options.IdleTimeout = TimeSpan.FromSeconds(10);
      options.Cookie.HttpOnly = true;
    });
  }

  public void Configure(IApplicationBuilder app)
  {
    app.UseSession();
    app.UseMvcWithDefaultRoute();
  }
}

public void ConfigureServices(IServiceCollection services){
  services.AddDistributedRedisCache(options=>{
    options.Configuration="127.0.0.1"; //多个redis服务器：{RedisIP}:{Redis端口},{RedisIP}:{Redis端口}
    options.InstanceName="sampleInstance";
  });
  services.AddMvc();
  services.AddSession();
}

using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Caching.Redis;
using Microsoft.Extensions.Caching.Distributed;

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

    public void ConfigureServices(IServiceCollection services){           
      services.AddDistributedRedisCache(options =>{        
        options.Configuration = "127.0.0.1";        
        options.InstanceName = "sampleInstance";      
      });      
      services.AddMvc();      
      services.AddSession();    
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env){      
      if (env.IsDevelopment())
      {        
        app.UseDeveloperExceptionPage();      
      }      
      else      
      {        
        app.UseExceptionHandler("/Home/Error");      
      }
      app.UseSession();
      app.UseStaticFiles();
      app.UseMvc(routes =>{        
        routes.MapRoute(name: "default",template: "{controller=Home}/{action=Index}/{id?}");      
      });    
    }  
  }
}

public class HomeController : Controller  
{    
  public IActionResult Index()    
  {      
    HttpContext.Session.Set("apptest",Encoding.UTF8.GetBytes("apptestvalue"));
    return View();    
  }
  public IActionResult ShowRedis()    
  {      
    byte[] temp;
    if(HttpContext.Session.TryGetValue("apptest",out temp))
    {        
      ViewData["Redis"]=Encoding.UTF8.GetString(temp);      
    }      
    return View();    
  }
}

Redis Session Value:ViewData["Redis"]

var redis = ConnectionMultiplexer.Connect("127.0.0.1:6379");
  services.AddDataProtection()
    .SetApplicationName("session_application_name")
    .PersistKeysToRedis(redis, "DataProtection-Keys");

using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Caching.Redis;
using Microsoft.Extensions.Caching.Distributed;

namespace app1{  
  public class Startup{    
    public Startup(IConfiguration configuration)    
    {      
      Configuration = configuration;    
    }
    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services){
      var redis = ConnectionMultiplexer.Connect("127.0.0.1:6379");
      services.AddDataProtection()
        .SetApplicationName("session_application_name")
        .PersistKeysToRedis(redis, "DataProtection-Keys");     
      services.AddDistributedRedisCache(options =>{        
        options.Configuration = "127.0.0.1";        
        options.InstanceName = "sampleInstance";      
      });      
      services.AddMvc();      
      services.AddSession();    
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env){      
      if (env.IsDevelopment())
      {        
        app.UseDeveloperExceptionPage();      
      }      
      else      
      {        
        app.UseExceptionHandler("/Home/Error");      
      }
      app.UseSession();
      app.UseStaticFiles();
      app.UseMvc(routes =>{        
        routes.MapRoute(name: "default",template: "{controller=Home}/{action=Index}/{id?}");      
      });    
    }  
  }
}

public class HomeController : Controller  
{    
  public IActionResult Index()    
  {      
    HttpContext.Session.Set("app1test",Encoding.UTF8.GetBytes("app1testvalue"));
    return View();    
  }
  public IActionResult ShowRedis()    
  {      
    byte[] temp;
    if(HttpContext.Session.TryGetValue("app1test",out temp))
    {        
      ViewData["Redis"]=Encoding.UTF8.GetString(temp);      
    }      
    return View();    
  }
}

Redis Session Value:ViewData["Redis"]

public class HomeController : Controller  
{    
  public IActionResult Index()    
  {      
    byte[] temp;
    if(HttpContext.Session.TryGetValue("app1test",out temp))
    {        
      ViewData["Redis"]=Encoding.UTF8.GetString(temp);      
    } 
    return View();    
  }
}

ViewData["Redis"]