using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Microsoft.OpenApi.Models;
 using System;
 using System.IO;
 using System.Reflection;

 namespace WebApplication4
 {
     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.AddControllers();
             services.AddSwaggerGen(c =>
             {
                 c.SwaggerDoc("v1", new OpenApiInfo { Title = ".Net Core中间件API文档", Version = "v1" });
                 // 为 Swagger 设置xml文档注释路径
                 var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
                 var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
                 c.IncludeXmlComments(xmlPath);
             });
         }

         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
         {
             //启用中间件服务生成Swagger
             app.UseSwagger();
             //启用中间件服务生成SwaggerUI，指定Swagger JSON终结点
             app.UseSwaggerUI(c =>
             {
                 c.SwaggerEndpoint("/swagger/v1/swagger.json", ".Net Core中间件API文档 V1");
                 c.RoutePrefix = string.Empty;//设置根节点访问
             });
             if (env.IsDevelopment())
             {
                 app.UseDeveloperExceptionPage();
             }
             app.UseRouting();
             app.UseAuthorization();
             app.UseEndpoints(endpoints =>
             {
                 endpoints.MapControllers();
             });
         }
     }
 }

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Logging;

 namespace WebApplication4.Controllers
 {
     /// <summary>
     /// 天气预报API
     /// </summary>
     [ApiController]
     [Route("api/[controller]/[action]")]
     public class WeatherForecastController : ControllerBase
     {
         private static readonly string[] Summaries = new[]
         {
             "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
         };

         private readonly ILogger<WeatherForecastController> _logger;

         public WeatherForecastController(ILogger<WeatherForecastController> logger)
         {
             _logger = logger;
         }

         /// <summary>
         /// 获取当前天气
         /// </summary>
         /// <param name="size">城市的个数</param>
         /// <returns></returns>
         [HttpGet]
         [HttpPost]
         ")
         {
             var rng = new Random();
             , Convert.ToInt32(size)).Select(index => new WeatherForecast
             {
                 Date = DateTime.Now.AddDays(index),
                 TemperatureC = rng.Next(-, ),
                 Summary = Summaries[rng.Next(Summaries.Length)]
             })
             .ToArray();
         }
         /// <summary>
         /// 测试方法
         /// </summary>
         /// <returns></returns>
         [HttpGet]
         public ApiResult Demo()
         {
             return new ApiResult
             {
                 Message = "操作成功！",
                 Success = true,
                 Result =
             };
         }
     }
 }