Web api属性路由，按内容类型，在dot net core 2中？

Question

我希望能够使用同一 URL 上发布的 JSON 或表单数据。

就目前而言，我得到：

fail: Microsoft.AspNetCore.Mvc.Internal.ActionSelector[1]
      Request matched multiple actions resulting in ambiguity. Matching actions: 
:
fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLDLB0LJCPJ4", Request id "0HLDLB0LJCPJ4:00000001": An unhandled exception was thrown by the application.
Microsoft.AspNetCore.Mvc.Internal.AmbiguousActionException: Multiple actions matched. The following actions matched route data and had all constraints satisfied:

https://andrewlock.net/model-binding-json-posts-in-asp-net-core/ 建议使用不同的端点，但在这种情况下我不能这样做。

https://massivescale.com/web-api-routing-by-content-type/ 建议为 asp.net 提供一种方法，例如：

[ContentTypeRoute("api/test/bytype", "application/json")]

或

[ContentTypeRoute("api/test/bytype", "application/x-www-form-urlencoded")]

但在 .net 核心中，我们没有 System.Web.Http.Routing。也许可以移植到使用 Microsoft.AspNetCore.Mvc.Routing... 但是有什么东西可以代替 IHttpRouteConstraint

我的问题：.net core mvc 中是否已经内置了类似的东西？

例如在Java的JAX-RS中，有@Consumes("application/json")

Answer 1

我通过 Consumes 属性实现了这一点：

http://example.com/payment/callback - 接受 x-www-form-urlencoded。

[HttpPost]
[Route("callback")]
[Consumes("application/x-www-form-urlencoded")]
public ActionResult Post([FromForm] string value)
{

}

http://example.com/payment/callback - 相同的 url 但接受 application/json。

[HttpPost]
[Route("callback")]
[Consumes("application/json")]
public ActionResult Post([FromBody] JObject value)
{

}