Web Api 2 API 无法识别多个路由属性（版本控制）

Question

我正在尝试从RoutingConstaints Sample 实现Attribute Routing 和VersionedRoute，但是当我在控制器上同时使用它们时，版本化属性不再起作用。

我需要对属性进行哪些修改才能使其与属性路由搭配得很好？

对于代码示例，请下载示例项目（或仅查看上面链接中的几个文件），然后按如下方式修改路由：

// When I use the RoutePrefix, VersionedRoute no longer works (Sending "Api-Version" through http header doesn't route correctly
// If I remove the RoutePrefix I can use VersionedRoute again
// What do I need to change in its code to be able to use both?

[VersionedRoute("api/Customers", 1)] // This route would be used as http://url/api/customers with a header of "api-version: 1"
[RoutePrefix("api/v1/Customers")] // This route would be used purely through url versioning of http://url/api/v1/Customers
public class CustomersV1Controller : ApiController {

    /* Other stuff removed */

    [VersionedRoute("api/Customer", 1)] // I'd rather not have to use this here at all and just use a single one on the class, but having both nor just one on either works right now.
    [Route("")]
    public IHttpActionResult Get()
    {
        return Json(_customers);
    }
}

VersionedRoute Code

VersionConstraint Code

编辑：如果您需要更多信息或发布想法或尝试的东西，请告诉我:)

Edit2：这是我在 Troy Hunt 的博客中尝试做的一个示例：http://www.troyhunt.com/2014/02/your-api-versioning-is-wrong-which-is.html

Edit3：这是我希望编码尽可能接近的内容，因为它会减少很多开销和魔术字符串。

[VersionedRoute("api/Customers", 1)] // This route would be used as http://url/api/customers with a header of "api-version: 1"
[RoutePrefix("api/v1/Customers")] // This route would be used purely through url versioning of http://url/api/v1/Customers
public class CustomersV1Controller : ApiController {

    /* Other stuff removed */
    [Route("")]
    public IHttpActionResult Get()
    {
        // Removed
        return Ok(customers);
    }


    [Route("{id:int}")]
    public IHttpActionResult GetById(int id)
    {
        // Removed
        return Ok(customer);
    }
}

[VersionedRoute("api/Customers", 2)] // This route would be used as http://url/api/customers with a header of "api-version: 2"
[RoutePrefix("api/v2/Customers")] // This route would be used purely through url versioning of http://url/api/v2/Customers
public class CustomersV2Controller : ApiController {

    /* Other stuff removed */
    [Route("")]
    public IHttpActionResult Get()
    {
        // Removed
        return Ok(customersThatAreDifferentThanV1);
    }


    [Route("{id:int}")]
    public IHttpActionResult GetById(int id)
    {
        // Removed
        return Ok(customerThatIsDifferent);
    }
}

编辑：最后一次碰撞，试图只在控制器属性级别而不是每个操作上为每个路由写入一次路由版本信息。

Answer 1

Route 和 VersionedRoute 属性可以很好地协同工作，但您的 RoutePrefix 属性也适用于您的 VersionedRoute（尝试访问 /api/v1/Customers/api/Customer - 您将获得设置 api-version 标头时的响应）

以下代码将针对您的示例中的两个 URL 产生所需的行为，返回正确的响应，但显然这并不能解决您想要一个 VersionedRoute 和一个 RoutePrefix 在类顶部的问题.为此将需要另一种方法。但是，您可以为不同的 api 版本设置单独的控制器。

[RoutePrefix("api")]
public class CustomersV1Controller : ApiController
{
    /* Other stuff removed */

    [VersionedRoute("Customers", 1)]
    [Route("v1/Customers")]
    public IHttpActionResult Get()
    {
        return Json(_customers);
    }
}

一个改进是创建您自己的属性而不是Route，这样您就不需要每次都为版本添加前缀：

public class CustomVersionedRoute : Attribute, IHttpRouteInfoProvider
{
    private readonly string _template;

    public CustomVersionedRoute(string route, int version)
    {
        _template = string.Format("v{0}/{1}", version, route);
    }

    public string Name { get { return _template; } }
    public string Template { get { return _template ; } }
    public int Order { get; set; }
}

[RoutePrefix("api")]
public class CustomersV2Controller : ApiController
{
    /* Other stuff removed */

    [VersionedRoute("Customers", 2)]
    [CustomVersionedRoute("Customers", 2)]
    public IHttpActionResult Get()
    {
        return Json(_customers);
    }
}