ASP.NET Core 5.0 Web API与开放源代码项目 Swashbuckle.AspNetCore 的维护人员合作，ASP.NET Core API 模板包含对 Swashbuckle 的 NuGet 依赖关系。Swashbuckle 是一个常用的开放源代码 NuGet 包，可动态发出 OpenAPI 文档。Swashbuckle 通过 API 控制器进行自检并在运行时或在生成时使用 Swashbuckle CLI 生成 OpenAPI 文档来实现此目的。

<Project Sdk="Microsoft.NET.Sdk.Web"><PropertyGroup><TargetFramework>net5.0</TargetFramework></PropertyGroup><ItemGroup><PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="5.0.0" NoWarn="NU1605" /><PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="5.0.0" NoWarn="NU1605" /><PackageReference Include="Swashbuckle.AspNetCore" Version="5.6.3" /></ItemGroup></Project>

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;namespace WebApplication40
{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 = "WebApplication40", Version = "v1" });});}// 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();app.UseSwagger();app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "WebApplication40 v1"));}app.UseHttpsRedirection();app.UseRouting();app.UseAuthorization();app.UseEndpoints(endpoints =>{endpoints.MapControllers();});}}
}

在 ASP.NET Core 5.0 中，Web API 模板默认启用 OpenAPI 支持。 若要禁用 OpenAPI，请执行以下操作：

• 通过命令行：

  .NET Core CLI

• dotnet new webapi --no-openapi true
  

• 通过 Visual Studio：取消选中“启用 OpenAPI 支持”。