Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Newtonsoft.Json.Serialization;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PT.Web.Mvc
{
    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.AddControllersWithViews();

            //运行时编译 视图运行时实时编译查看 不需要重新启动运行
            services.AddMvc().AddRazorRuntimeCompilation();

            //控制器使用JsonResult返回json是使用默认格式，不要用驼峰命名
            services.AddControllersWithViews()
               .AddNewtonsoftJson(options =>
               {
                   //不使用驼峰样式的key
                   options.SerializerSettings.ContractResolver = new DefaultContractResolver();
               });

            //Session
            services.AddSession(p => p.IdleTimeout = TimeSpan.FromMinutes(30));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }
            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthorization();

            //Session
            app.UseSession();

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