The repeated fields in a protobuf message is empty in a POST api in ASP.NET Core - asp.net-core

Question

As the title said, when I try to post a message (which is generated by protobuf message) from a react application to ASP.NET Core, the backend cannot receive the repeated fields (empty).
The following is the payload of a post action from the browser:
{ "strs": [ "test1", "test2" ] }
enter image description here
But in the POST API of ASP.NET Core, the body is just empty:
enter image description here
The protobuf message is very simple:
message TestArray {
repeated string strs = 1;
}
Any advice will be appreciated. Thank you in advance.
Part of the generated TestArray class in C#:
using pb = global::Google.Protobuf;
using pbc = global::Google.Protobuf.Collections;
using pbr = global::Google.Protobuf.Reflection;
// ...
public sealed partial class TestArray : pb::IMessage<TestArray>
// ...
private readonly pbc::RepeatedField<string> strs_ = new pbc::RepeatedField<string>();
// ...
public pbc::RepeatedField<string> Strs {
get { return strs_; }
}

Answer 1

I followed this document and created the model as below:
public class TestArray
{
public RepeatedField<string> Strs { get; set; }
}
Tested with postman:
It seems binded successfully,so I asked you for the details of TestArray class to check what's wrong
I think you could create a DTO and add the necessary data to the instance of TestArray class
public sealed partial class TestArray
{
private readonly RepeatedField<string> strs_ = new RepeatedField<string>();
public RepeatedField<string> Strs
{
get { return strs_; }
}
}
public class SomeDto
{
public string[] Strs { get; set; }
}
In controller:
[HttpPost]
public IActionResult Post(SomeDto dto)
{
var testarr = new TestArray();
testarr.Strs.Add(dto.Strs);
return Ok();
}
Result: