Alternate Model Binding On Controllers Post Action - asp.net-core

Question

EDIT: You can safely clone https://github.com/vslzl/68737969 and run the example. If you send
{
"intPropB":3
}
as POST body to: http://localhost:5000/api/Test
you'll see it binds clearly B object to A object.
#EDIT END
I'd like to implement alternate model binding using asp.net core 5 As you will see below, I have two alternative classes to bind at a single endpoint. Each request can contains only a valid A model or B model and A and B has different properties.
[HttpPost(Name = Add)]
public async Task<IActionResult> AddAsync(CancellationToken ct)
{
var aModel= new A();
var bModel= new B();
if (await TryUpdateModelAsync<A>(aModel))
{
_logger.LogDebug($"Model binded to A");
return Ok(aModel);
}
else if (await TryUpdateModelAsync<B>(bModel))
{
_logger.LogDebug($"Model binded to B");
return Ok(bModel);
}
_logger.LogDebug("Nothing binded!");
return BadRequest();
}
But this approach failed. Is there a proper way to implement this kind of solution?
By the way I'm using this to reduce complexity of my endpoints, I want to update a record partially and by doing this, each model will map the same record but with different logics.
Any suggestions will be appreciated. Thanks.

Answer 1

Couldn't manage to provide elegant way to do this but here is what I've done so far, It works but seems a little ugly in my opinion.
I changed the action method to this:
[HttpPost(Name = Add)]
[AllowAnonymous]
public IActionResult AddSync([FromBody] JObject body)
{
var aModel = JsonConvert.DeserializeObject<A>(body.ToString());
var bModel = JsonConvert.DeserializeObject<B>(body.ToString());
ModelState.Clear();
var aValid = TryValidateModel(aModel);
ModelState.Clear();
var bValid = TryValidateModel(bModel);
// some logic here...
return Ok(new {aModel,bModel, aValid, bValid });
}
I think It's not a good idea to interfere with ModelState this way.
But here is what I've done,
get the raw body of the request as JObject (requires Newtonsoft.Json package)
Parsed that json value to candidate objects
Check their validity via modelstate and decide which one to use.