Nested list JSON .NET

问题

I am currently trying to accept a POST request to a .NET Core Web API endpoint that accepts the following model:

public class OrderPost
{
    [Required]
    public string DeliveryStreet { get; set; }

    public string DeliveryBuilding { get; set; }

    [Required]
    public string DeliveryCity { get; set; }

    [Required]
    public string DeliveryProvince { get; set; }

    [Required]
    public string DeliveryPostalCode { get; set; }

    [Required]
    public string CardName { get; set; }

    [Required]
    public string CardNumber { get; set; }

    [Required]
    public string CardExpiry { get; set; }

    [Required]
    public long CardCvv { get; set; }

    [Required]
    public List<OrderItem> OrderItems { get; set; }
}

public class OrderItem
{
    public long Id { get; set; }
    public string Category { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public Uri ImageUrl { get; set; }
    public long Price { get; set; }
    public DateTimeOffset CreatedAt { get; set; } 
    public DateTimeOffset UpdatedAt { get; set; }
    public long Quantity { get; set; }
}

When I remove the List<OrderItem> and post the data without the List the call works perfectly. As soon as I add the list back and try and POST the data I get a 400 Bad Request error. I have a feeling I am just missing some attribute or something on the List. The JSON I am posting is valid, I double checked that. Any ideas of what could be causing this?

Here is the JSON I am POST'ing:

{
    "deliveryStreet": "Test street",
    "deliveryBuilding": "",
    "deliveryCity": "TEst",
    "deliveryProvince": "TEst",
    "deliveryPostalCode": "0852",
    "cardName": "Jane Jones",
    "cardNumber": "4711 1000 0000 0000",
    "cardExpiry": "05 / 20",
    "cardCvv": "123",
    "orderItems": [{
        "id": 1,
        "category": null,
        "name": "Test",
        "description": "Test test test",
        "imageUrl": "http://google.com/",
        "price": 625,
        "createdAt": "2019-02-21T13:25:56.709192",
        "updatedAt": "2019-02-21T13:25:56.709192",
        "quantity": 5
    }]
}

Here is the Endpoint that I am trying to POST to:

[HttpPost]
public IActionResult Post([FromBody]OrderPost data)
{
        //Get the credit card type off of the number
        var type = StringUtilities.GetCardTypeFromNumber(data.CardNumber);
        //Check if valid type was found
        if (type == "UNKNOWN")
            return BadRequest("Unknown credit card type");

        float total = 0;
        .................
}

回答1:

How about you send ?

data: {
   deliveryObj: yourDeilveryObj,
   orderItems: yourOrderItemsArray
}

And your json obj should look like the following:

{   
    "deliveryObj":      
        {   
            "deliveryStreet": "Test street",
            "deliveryBuilding": "",
            "deliveryCity": "TEst",
            "deliveryProvince": "TEst",
            "deliveryPostalCode": "0852",
            "cardName": "Jane Jones",
            "cardNumber": "4711 1000 0000 0000",
            "cardExpiry": "05 / 20",
            "cardCvv": "123",
        }, 

    "orderItems": [{
        "id": 1,
        "category": null,
        "name": "Test",
        "description": "Test test test",
        "imageUrl": "http://google.com/",
        "price": 625,
        "createdAt": "2019-02-21T13:25:56.709192",
        "updatedAt": "2019-02-21T13:25:56.709192",
        "quantity": 5
    }]
}

Now, at the backend, you should receive it as JObject.

Your receiving method should look like thisPost(JObject objData). Now you can break down this objData to JObject and JArray. It would look like something:

[HttpPost]
public IHttpActionResult POST(JObject objData)
        {

            dynamic jsonData = objData;

            //DeliveryObj
            JObject deliveryObjJson = jsonData.deliveryObj;
            var deliveryObj= deliveryObjJson .ToObject<OrderPost>();

            //OrderItemsArray
            JArray orderItemsJson = jsonData.orderItems;
            var orderItems = orderItemsJson.Select(item => item.ToObject<OrderItem>()).ToList();



            return Ok(_services.Post(deliveryObj, orderItems ).Data);
        }

回答2:

For Asp.Net Core Web api, Model validation errors automatically trigger an HTTP 400 response, check Automatic HTTP 400 responses .

Try to make a test with code below:

services.AddMvc()
    .SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
    .ConfigureApiBehaviorOptions(options =>
    {
        options.SuppressModelStateInvalidFilter = true;
    });

来源：https://stackoverflow.com/questions/54809578/nested-list-json-net