How to use PostAsJsonAsync with fields containing arrays in Blazor?

Question

@inject HttpClient Http 
@page "/"
<button class="checkout" @onclick="() => createOrder()">Place Order</button>
@code {

public List<CartToSendItems> items { get; set; } = new List<CartToSendItems>();
public class CartToSend
{
    public Guid customerId { get; set; }
    public List<CartToSendItems> items = new List<CartToSendItems>();
}
public class CartToSendItems
{
    public int productId { get; set; }
    public int qty { get; set; }
}
public async Task createOrder()
{
    CartToSend body = new CartToSend();
    body.customerId = Guid.Parse("68e03745-e4a2-480f-9f39-eac36aa1ddcd");
    body.items = GetItems();
    var jsonBody = System.Text.Json.JsonSerializer.Serialize<CartToSend>(body);
    Console.WriteLine(jsonBody.ToString());
    Console.WriteLine("items: " + body.items.Count.ToString());
    var httpResponse = await Http.PostAsJsonAsync<CartToSend>("http://localhost:1337/orders/create", body);
}
protected List<CartToSendItems> GetItems() {
    List<CartToSendItems> ret = new List<CartToSendItems>();
    CartToSendItems item1 = new CartToSendItems();
    item1.productId = 1;
    item1.qty = 2;
    CartToSendItems item2 = new CartToSendItems();
    item2.productId = 4;
    item2.qty = 2;
    ret.Add(item1);
    ret.Add(item2);
    return ret;
}
} 

This is actually just sending the customerId and the items is being ignored. So the backend server is just receiving: { customerId: '68e03745-e4a2-480f-9f39-eac36aa1ddcd' }

What is the correct way to perform this action ? thanks in advance

EDIT: Example edited for a better understanding as raw.

My consoles outputs:

{"customerId":"68e03745-e4a2-480f-9f39-eac36aa1ddcd"}

items: 2

NodeJS Backend log:

Debugger listening on ws://127.0.0.1:5858/1c18c737-e806-4770-ac13-8bd6e6c821b3

For help, see: https://nodejs.org/en/docs/inspector

Debugger attached.

GET / 304 466.248 ms - -

GET /stylesheets/main.css 304 1.439 ms - -

OPTIONS /orders/create 204 0.463 ms - 0

Missing Fields { customerId: '68e03745-e4a2-480f-9f39-eac36aa1ddcd' }

POST /orders/create 403 18.247 ms - 18

Answer 1

replace this method :

public class CartToSend
{
    public Guid customerId { get; set; }
    public List<CartToSendItems> items = new List<CartToSendItems>();
}

by :

public class CartToSend
        {
            public Guid customerId { get; set; }
            public List<CartToSendItems> items { get; set; } = new List<CartToSendItems>();
        }

'items' was delclared as field that why it does not get serialized