How to make it so that the property is ignored if it has a string type?

Question

I have a model:

public class Data
{
    [JsonPropertyName("id")]
    public string OrderId { get; set; }
    public Order Order { get; set; }
}

I want the property 'Order' to be ignored if the response contains that property of type string and not ignore if object. Maybe, JsonIgnoreAtribute with something options

Third-party service send json to my endpoint. First option has view:

{
    "data": {
        "order": "T5TKlQn-SlCJTZJuUvC05g",
        "id": "T5TKlQn-SlCJTZJuUvC05g"
   }
}

Second option has view:

{
    "data": {
        "order": {
            "id": "dhdjd",
            "name": "test"
        },
        "id": "T5TKlQn-SlCJTZJuUvC05g"
    }
}

And I want to ignore the order property if it has string type

This json is parameter to api:

[HttpPost("order")]
public async Task OrderAsync([FromBody] Data viewModel)
{
    // .. code
}

Answer 1

IMHO it is better to use Newtonsoft.Json because code is much more simple and clear. TextJson will need a custom json converter

var json1=@"{
    ""data"": {
        ""order"": ""T5TKlQn-SlCJTZJuUvC05g"",
        ""id"": ""T5TKlQn-SlCJTZJuUvC05g""
   }
}";

var json2=@"{
    ""data"": {
        ""order"": {
            ""id"": ""dhdjd"",
            ""name"": ""test""
        },
        ""id"": ""T5TKlQn-SlCJTZJuUvC05g""
    }
}";

using Newtonsoft.Json;

Data data = JsonConvert.DeserializeObject<Root>(json1).data;

classes

public class Root
{
    public Data data {get;set;}
}
public class Data
{
    [JsonProperty("id")]
    [JsonPropertyName("id")]
    public string OrderId { get; set; }

    public Order Order { get; set; }
    
    public Data(JToken order)
    {
        if(order.Type==JTokenType.Object)
        Order=order.ToObject<Order>();
    }

    public Data() {}
}
public class Order
{
    public string Id { get; set; }
    public string Name { get; set; }
}

or if you still want to use text.json it will be more complicated

using System.Text.Json;

var jsonObj = System.Text.Json.Nodes.JsonNode.Parse(json1);

if ( jsonObj.AsObject()["data"]["order"].GetType().ToString()
           != "System.Text.Json.Nodes.JsonObject") 
                    jsonObj.AsObject()["data"]["order"]=null;

var options = new JsonSerializerOptions
{
    PropertyNameCaseInsensitive = true
};

var data=jsonObj.Deserialize<Root>(options).data;

api

[HttpPost("order")]
public async Task OrderAsync([FromBody]JsonNode jsonObj)
{
    if (jsonObj.AsObject()["data"]["order"].GetType().ToString()
           != "System.Text.Json.Nodes.JsonObject")
                jsonObj.AsObject()["data"]["order"] = null;

            var options = new JsonSerializerOptions
            {
                PropertyNameCaseInsensitive = true
            };

             Data data = jsonObj.Deserialize<Root>(options).data;

    // .. code
}