how to send array to API which contains image and other data in .net core

When I am passing a single object like below then it is working as per below image

[HttpPost]
public async Task<ActionResult> Post([FromForm] MyModel Details)
{
}

but when I am passing the List of the object to API then it is not working. option to upload a file is not visible. and if I entered any values in the array then also I am getting count 0 for details.

 [HttpPost]
 public async Task<ActionResult> Post([FromForm] List<MyModel> Details)
 {}

I want to pass the List of images and descriptions to API. How can I achieve it?

Thanks in advance!

Solution 1:

You need custom model binding for the list model . Here is a similar demo:

custom model binding code:

public class MetadataValueModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        if (bindingContext == null)
            throw new ArgumentNullException(nameof(bindingContext));

        var values = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

        if (values.Length == 0)
            return Task.CompletedTask;
        var options = new JsonSerializerOptions() { PropertyNameCaseInsensitive = true };

        var deserialized = JsonSerializer.Deserialize(values.FirstValue, bindingContext.ModelType, options);

        bindingContext.Result = ModelBindingResult.Success(deserialized);
        return Task.CompletedTask;
    }
}

Add the model binder to the model class:

public class MasterDTO
{
    public string Comments { get; set; }
    public IFormFile File { get; set; }        
    public List<DetailDTO> Details { get; set; }

    public MasterDTO()
    {
        this.Details = new List<DetailDTO>();
    }
}

[ModelBinder(BinderType = typeof(MetadataValueModelBinder))]
public class DetailDTO
{
    public Int64 ElementId { get; set; }

    public double LowerLimit { get; set; }

    public double HigherLimit { get; set; }

    public string Status { get; set; }

    public string UserAuthorization { get; set; }

    public DateTime? AutorizationDate { get; set; }
}

controller/action

        [HttpPost]
        public async Task<IActionResult> CreateProjectLimit([FromForm] MasterDTO masterDto)
        {
            //...

            return Ok();
        }

You can just use postman to pass the list of images and Descriptions to API