Could not determine JSON object type for anonymous type-CodePudding

I am trying to create a JSON object which should look like this when converted into a string:

{
    "ts":1634712287000,
    "values":{
        "temperature":26,
        "humidity":87
    }
}

This is how I tried to do it by creating a Newtonsoft.Json.Linq.JObject:

new JObject(new
{
    Ts = 1634712287000,
    Values = new JObject(new
    {
        Temperature = 26,
        Humidity = 87
    }),
});

With this code I get the following error:

Could not determine JSON object type for type <>f__AnonymousType2`2[System.Int32,System.Int32]."}   System.ArgumentException

I am obviously doing something wrong but I cannot figure out how to do this correctly. What am I doing wrong and how can I create a JObject like in my example above via code?

CodePudding user response：

We can try to use Json.NET with an anonymous object if you don't want to create a class.

var jsonData = JsonConvert.SerializeObject(new {
    ts = 1634712287000,
    Values = new {
        Temperature = 26,
        Humidity = 87
    }
});

CodePudding user response：

You need to create the whole anonymous object first, and then you can convert it, so:

var obj = new {
    ts = 1634712287000,
    values = new {
        temperature = 26,
        humidity = 87
    },
};

var json = JObject.FromObject(obj).ToString(Newtonsoft.Json.Formatting.Indented);

Output:

{
  "ts": 1634712287000,
  "values": {
    "temperature": 26,
    "humidity": 87
  }
}

CodePudding user response：

To add the System.Text.Json Version:

using System;
using System.Text.Json;

public class Program
{
    public static void Main()
    {
        var myAnonymousModel = new
        {
            Ts = 1634712287000,
            Values = new
            {
                Temperature = 26,
                Humidity = 87
            }
        };
        var camelCasePolicyOptions = 
             new JsonSerializerOptions(){ PropertyNamingPolicy = 
                                            JsonNamingPolicy.CamelCase,
                                           WriteIndented = true };
        Console.WriteLine(
              JsonSerializer.Serialize(myAnonymousModel, 
                                       camelCasePolicyOptions ));   
    }
}

Output:

{
  "ts": 1634712287000,
  "values": {
    "temperature": 26,
    "humidity": 87
  }
}

See https://dotnetfiddle.net/JPUJRv