[开发测试]25 | 路由与终结点

1. 路由注册方式

• 路由模板的方式（MVC页面的Web配置）
• RouteAttribute方式（更适合WebApi）

2. 路由约束

• 类型约束
• 范围约束
• 正则表达式
• 是否必选
• 自定义IRouteConstraint

3. URL生成

• LinkGenerator
• IUrlHelper

4. 注册Swagger并将xml文件注入

如果没有xmlwen文件：项目->鼠标右键->属性->生成->输出->XML文档文件（勾选）

            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" });
                var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
                var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
                c.IncludeXmlComments(xmlPath);
            });

                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "NET_Core v1"));

5. 路由约束代码

备注1：[Route("api/[controller]/[action]")]，action会将相应的方法名作为url

备注2：约束校验不通过，是不会走向接口里面的

    [Route("api/[controller]/[action]")]
    [ApiController]
    public class OrderController : ControllerBase
    {
        /// <summary>
        /// 自定义约束
        /// </summary>
        /// <param name="id">必须可以转long</param>
        /// <returns></returns>
        [HttpGet("{id:isLong}")]
        public bool OrderExist([FromRoute]string id)
        {
            return true;
        }

        /// <summary>
        /// 最大值
        /// </summary>
        /// <param name="id"></param>
        /// <param name="link"></param>
        /// <returns></returns>
        [HttpGet("{id:max(20)}")]
        public bool Max(long id,[FromServices]LinkGenerator link)
        {
            var a = link.GetPathByAction("Reque", "order");
            return true;
        }

        /// <summary>
        /// 必填
        /// </summary>
        /// <param name="name">姓名</param>
        /// <returns></returns>
        [HttpGet("{name:required}")]
        public bool Reque(string name)
        {
            return true;
        }

        /// <summary>
        /// 正则表达式
        /// </summary>
        /// <param name="number">以3个数字开始</param>
        /// <returns></returns>
        [HttpGet("{number:regex(^\\d{{3}}$)}")]
        public bool Number(string number)
        {
            return true;
        }
    }

    public class MyRouteConstraint : IRouteConstraint
    {
        public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection)
        {
            if(RouteDirection.IncomingRequest == routeDirection)
            {
                var val = values[routeKey];
                if(long.TryParse(val.ToString(),out var value) == true)
                {
                    return true;
                }
            }
            return false;
        }
    }

注册自定义路由约束：

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddDirectoryBrowser();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" });
                var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
                var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
                c.IncludeXmlComments(xmlPath);
            });

            //添加自定义路由验证
            services.AddRouting(options =>
            {
                options.ConstraintMap.Add("isLong", typeof(MyRouteConstraint));
            });
        }

6. 链接生成

        /// <summary>
        /// 最大值
        /// </summary>
        /// <param name="id"></param>
        /// <param name="link"></param>
        /// <returns></returns>
        [HttpGet("{id:max(20)}")]
        public bool MaxUrl(long id, [FromServices] LinkGenerator link)
        {
            //相对地址
            var a = link.GetPathByAction(HttpContext,
                action: "Reque",
                controller: "Order",
                values: new { name = "abc" });
            
            //绝对地址
            var uri = link.GetUriByAction(HttpContext,
                action: "Reque",
                controller: "Order",
                values: new { name = "abc" });

            return true;
        }

7. 接口废弃

方法名上加上：?[Obsolete]