How to use Kiota MultiPart with IFormFileCollection

Question

I am using Kiota to generate an HTTP client within a shared project among multiple solutions. Everything is functioning as expected, except for one specific use case related to a POST resource. The resource and command are defined as follows:

[HttpPost]
public async Task<ActionResult> Post([FromForm] CreateUserCommand command)
    => Ok(await _mediator.Send(command)); 

The CreateUserCommand includes an IFormFileCollection for attachments:

public class CreateUserCommand : IRequest< bool>
{

    public CreateUserCommand ()
    {
    }

    public string Email { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public string Address { get; set; }

    public string Phone { get; set; }

    public IFormFileCollection Attachements { get; set; } = new FormFileCollection();
  }

Kiota generates the following method signature:

    public async Task<Int32BooleanResultResponse?> PostAsync(MultipartBody body, Action<RequestBuilderPostRequestConfiguration>? requestConfiguration = default, CancellationToken cancellationToken = default) 

Here is an example of how I attempted to construct the MultipartBody: so in my request i need to send the user informations with attachements file, does any one knows how to do it, i did not find anything in the documentation

       var multipartBody = new MultipartBody();

        multipartBody.AddOrReplacePart("email", "application/json", applyCommand.Email);
        multipartBody.AddOrReplacePart("address", "application/json", applyCommand.Address);
        multipartBody.AddOrReplacePart("firstName", "application/json", applyCommand.FirstName);
        multipartBody.AddOrReplacePart("lastName", "application/json", applyCommand.LastName);
        multipartBody.AddOrReplacePart("phone", "application/json", applyCommand.Phone);

Can anyone provide guidance on how to properly structure the request to send user information along with attachment files using Kiota? Any insights or examples would be greatly appreciated.

Answer 1

Here is how one can send both the properties AND the attachments within the same request for this backend/scenario.

var multipartBody = new MultipartBody();
    
multipartBody.AddOrReplacePart("Email", "application/x-www-form-urlencoded", applyCommand.Email);
multipartBody.AddOrReplacePart("Address", "application/x-www-form-urlencoded", applyCommand.Address);
multipartBody.AddOrReplacePart("FirstName", "application/x-www-form-urlencoded", applyCommand.FirstName);
multipartBody.AddOrReplacePart("LastName", "application/x-www-form-urlencoded", applyCommand.LastName);
multipartBody.AddOrReplacePart("Phone", "application/x-www-form-urlencoded", applyCommand.Phone);
multipartBody.AddOrReplacePart("filename", "application/octet-stream", fileStream); // filename must be unique