如何在同一个url上使用[FromBody]和[FromForm]?[重复]

客户可以发送数据给我 JSON 或 application/x-www-form-urlencoded 总体安排如何在不分离不同URL的情况下处理这些请求?我试了两个案子。它不起作用; 案例1:

[Route ( "api/[controller]" )]
[ApiController]
public class FirstController : ControllerBase
{
    [HttpPost]
    public string SomePostFromBody ( [FromBody] TestClass obj )
    {
        return obj.Prop1 + obj.Prop2;
    }

    [HttpPost]
    public string SomePostFromForm ( [FromForm] TestClass obj )
    {
        return obj.Prop1 + obj.Prop2;
    }
}

案例2:

[Route ( "api/[controller]" )]
[ApiController]
public class FirstController : ControllerBase
{
    [HttpPost]
    public string SomePost( [FromBody][FromForm] TestClass obj )
    {
        return obj.Prop1 + obj.Prop2;
    }
}