netcore3.0 webapi集成Swagger 5.0

今天来尝尝鲜。貌似.net core 3.0使用Swagger 4.0.1会报错，随手一搜，还没人写这个把调试通过的代码贴一下：

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();
            });            
        }
    }
}

依赖包：

控制器：

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]
        public IEnumerable<WeatherForecast> GetWeather(string size = "5")
        {
            var rng = new Random();
            return Enumerable.Range(1, Convert.ToInt32(size)).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                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 = 1
            };
        }
    }
}