c# Newtonsoft Deserialize Json into object depending on properties

Question

Im in a situation where I am receiving Json that can be in two different formats and I am trying to find a good way to deserialize it into their respective objects. I have one Json string that would look like:

{
"Id": 1,
"Result": "true",
"Comment": "test comment"
}

And the other like:

{
"UserId": 12,
"PhoneNumber": "123456789",
"Message": "test message"
}

I had created an object that could hold both structures, something like:

public class EnvelopeObject
{
   public Structure1 { get; set; }
   public Structure2 { get; set; }
}

and ideally after deserializing the json into EvelopeObject I would have one object populated with the data from the json and the other would just be null. I know that this situation would require a custom converter, but after reading the documentation and looking for other examples, Im unsure how to go about this. Is there a simple custom converter solution, or an easier way to go about this?

Answer 1

i create you example as another approach. call function which will return tuple of 2 classes, that which will match - would be populated. i use ID (first property) to identify which class to bind if you set jason as j2 or j1 you will get different class

void Main()
{
    var j1 = "{\"Id\":1,\"Result\":\"true\",\"Comment\":\"test comment\"}";
    var j2 = "{\"UserId\":12,\"PhoneNumber\":\"123456789\",\"Message\":\"test message\"}";
    
    string json = j2;
    
    GetClassSet(json).Dump();

    
    
}

public (Json1Object, Json2Object) GetClassSet(string json){

    using var doc = System.Text.Json.JsonDocument.Parse(json);
    object result = null;
    JObject res = (JObject)JsonConvert.DeserializeObject(json);
    if (res.First.ToObject<JProperty>().Name.ToUpper() == "ID")
    {
        return(res.ToObject<Json1Object>(), null);
    }
    else
    {
        return (null, res.ToObject<Json2Object>());
    }
}

public class Json1Object
{
    public string Id;
    public string Result;
    public string Comment;
}

public class Json2Object
{
    public string UserId;
    public string PhoneNumber;
    public string Message;
}

the results would be or