I found that is anulgarjs and ASP.net Core are working very well together!
In the client side:

var Item = {};
Item.Id = 1;
Item.Name = "Test";
$http.post('/Items/Create', Item);

In the server side controller, then the JSON object can automatic parsed.
You just need to use [FromBody], I found without that, the parameter object will be always null. I think you need to tell the MVC, where is the JSON content:

[HttpPost]
[Authorize]
public async Task Create([FromBody] Item item)
That's easy and clean!