install-package Swashbuckle.AspNetCore -project XXX -version 6.4.0

/// <summary>
    /// Swagger 靜態類
    /// </summary>
    public static class SwaggerExtend
    {
        /// <summary>
        /// 添加服務: swagger
        /// </summary>
        /// <param name="services"></param>
        /// <returns></returns>
        public static void AddCustSwagger(this IServiceCollection services)
        {
            var version = "V1.0";
            var apiName = "XXX系統";
            services.AddSwaggerGen(options =>
            {
                options.ResolveConflictingActions(apiDescriptions => apiDescriptions.First());

                options.SwaggerDoc("system_v1", new OpenApiInfo
                {
                    Version = version,
                    Title = $"{apiName} API",
                    Description = $"{apiName} {version} 接口服務"
                });

                //  獲取應用程序所在目錄
                var basePath = Path.GetDirectoryName(typeof(SwaggerExtend).Assembly.Location);
                var xmlPath = Path.Combine(basePath, "ProjectName.xml");
                //  swagger界面默認只顯示 方法&字段 注釋，不顯示 控制器注釋
                //  第二個參數為true， 則是controller的注釋
                //options.IncludeXmlComments(xmlPath);
                options.IncludeXmlComments(xmlPath, true);
            });
        }

        /// <summary>
        /// 添加中間件: swagger
        /// </summary>
        /// <param name="app"></param>
        public static void UseCustSwagger(this IApplicationBuilder app)
        {
            app.UseSwagger();
            app.UseSwaggerUI(options =>
            {
                options.SwaggerEndpoint("/swagger/system_v1/swagger.json", "系統API");
                //  默認路徑為：/swagger/index.html
                //  路由前綴 - 設置為空，可直接跳轉到swagger頁面：/index.html
                //  api測試可設置為空，部署時容易與前端路由沖突
                options.RoutePrefix = string.Empty;
            });
        }
    }

public void ConfigureServices(IServiceCollection services)
        {
            services.AddCustSwagger();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseCustSwagger();
        }