How do I can pass the complex model object to api

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C#

MVC

I want to pass a complex model to the web api from my MVC controller but i am receiving the null model at the api can anybody please help me to pass the complex model object to the web api. Here is my model.

public class Defination
{
    public Defination()
    {
        Layers = new List<ILayerSettings>();
        Operations = new List<IOperationSettings>();
    }

    public bool PreserveExifData { get; set; }

    public bool FixGamma { get; set; }

    public IList<ILayerSettings> Layers { get; private set; }

    public IList<IOperationSettings> Operations { get; private set; }

    public int? Quality { get; set; }

    public Dimension Dimensions { get; set; }

    public ImageFormat Format { get; set; }

}

What I have tried:

this is my controller code :

public ActionResult DynamicImages(string name)
{
    Defination def = new Defination { Dimensions = new Dimension(400, 400), FixGamma = true, PreserveExifData = false, Format = ImageFormat.Png };
    //def.Layers.Add(new BarcodeLayerSettings { Dimensions = new Dimension(200, 200), Contents = "123456789012345678-123456789012345678", PureBarcode = false, Type = BarCodeType.CODE_128 });

    def.Layers.Add(new ImageLayerSettings { Dimensions = new Dimension(200, 200), URL = "http://www.joshuacasper.com/contents/uploads/joshua-casper-samples-free.jpg", Coordinates = new Coordinates(50, 150), Resize = false });

    def.Layers.Add(new BarcodeLayerSettings { Dimensions = new Dimension(200, 200), Contents = "123456789012345678", Type = BarCodeType.CODE_128 });

    var tl = new TextLayerSettings { Dimensions = new Dimension(200, 200), Coordinates = new Coordinates(100, 100) };
    tl.Strings.Add(new TextString { Brush = "Red", Message = "Testing" });

    def.Layers.Add(tl);

    def.Operations.Add(new RoundCornersSettings { Radius = 20 });

    try
    {
        HttpClient client = new HttpClient();

        client.BaseAddress = new Uri("http://localhost:61787/");
        client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

        var response = client.PostAsJsonAsync("api/FulfilmentDynamicImage/Generate", def).Result;
        response.EnsureSuccessStatusCode();

        Task<stream> task = response.Content.ReadAsStreamAsync();

        Stream readOnlyStream = task.Result;
        Byte[] buffer = new Byte[readOnlyStream.Length];
        readOnlyStream.Read(buffer, 0, buffer.Length);
        MemoryStream memoryStream = new MemoryStream(buffer);
        Image image = Image.FromStream(memoryStream);

        image.Debug("FINAL");

    }
    catch (HttpRequestException httpEx)
    {
        // determine error here by inspecting httpEx.Message
    }
    return View();
}

and this is my api

[Route("Generate")]
[HttpPost]
public HttpResponseMessage Generate(Defination def)
{
    ImageGenerator imageGenerator = new ImageGenerator();
    var stream = imageGenerator.Generate(def);

    var img = Image.FromStream(stream);
    MemoryStream ms = new MemoryStream();
    img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
    HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
    result.Content = new ByteArrayContent(ms.ToArray());
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
    return result;

    //var image = Image.FromStream(stream);
    //return image;
}