Core 3.0 添加Swagger文档支持

 services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo
                {
                    Title = "Test API",
                    Description = "This Is Description",
                    Version = "v1",
                    Contact = new OpenApiContact() { Name = "Zhang San", Email = "888888888@qq.com" }
                });

                var xmlPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "CoreApi.xml");
                c.IncludeXmlComments(xmlPath);
            });

         // 启用Swagger中间件
            app.UseSwagger();
            // 配置SwaggerUI
            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "Test V1");
            });

 [Route("api/[controller]")]
    [ApiController]
    public class TestController : ControllerBase
    {
        /// <summary>
        /// 加法运算
        /// </summary>
        /// <param name="a">第一个数</param>
        /// <param name="b">第二个数</param>
        /// <returns></returns>
        [HttpPost("Addition")]
        public int A(int a, int b)
        {
            return a + b;
        }

        /// <summary>
        /// 减法运算
        /// </summary>
        /// <param name="a">第一个数</param>
        /// <param name="b">第二个数</param>
        /// <returns></returns>
        [HttpGet("Subtraction")]
        public int B(int a, int b)
        {
            return a - b;
        }
    }