Access nested key value pairs

Question

I have a relatively simple nested JSON string for data below:

{  "d" : {
     "humidity": "39.21",
     "acc_y": "1.21",
     "ambient_temp": "24.21",
     "air_pressure": "1029.21",
     "object_temp": "23.21",
     "acc_z": "0.21",
     "acc_x": "3.21",
   } 
}

I have a c# windows service application which receives the JSON string and Deserialize string.

private static void client_MqttMsgPublishReceived(object sender, uPLibrary.Networking.M2Mqtt.Messages.MqttMsgPublishEventArgs e)
    {

        //Console.WriteLine(System.Text.Encoding.Default.GetString(e.Message));
        string json = System.Text.Encoding.Default.GetString(e.Message);

        var obj = JsonConvert.DeserializeObject<IDictionary<string, object>>(json, new JsonConverter[] { new MyConverter() });

    }

I have a Myconvert Class which looks like this, which reads the JSON:

class MyConverter : CustomCreationConverter<IDictionary<string, object>>
{
    public override IDictionary<string, object> Create(Type objectType)
    {
        return new Dictionary<string, object>();
    }

    public override bool CanConvert(Type objectType)
    {
        // in addition to handling IDictionary<string, object>
        // we want to handle the deserialization of dict value
        // which is of type object
        return objectType == typeof(object) || base.CanConvert(objectType);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.StartObject
            || reader.TokenType == JsonToken.Null)
            return base.ReadJson(reader, objectType, existingValue, serializer);

        // if the next token is not an object
        // then fall back on standard deserializer (strings, numbers etc.)
        return serializer.Deserialize(reader);
    }
}

I can see the JSON data in my debug window in the obj object.

This may be a very straight forward question, how do i extract the JSON key value pair data (eg. humidity, ambient temp) to use in my program, as currently i can only see them in the debug window?

Thank you for any help!

Brian Rogers · Accepted Answer · 2015-09-30 17:20:30Z

2

You don't actually need a converter to deserialize this JSON. A simple wrapper class will do it:

class Wrapper
{
    public Dictionary<string, object> d { get; set; }
}

Then:

Dictionary<string, object> obj = JsonConvert.DeserializeObject<Wrapper>(json).d;

Fiddle: https://dotnetfiddle.net/vnoQxi

edited Sep 30, 2015 at 17:20

answered Sep 30, 2015 at 17:13

Brian Rogers

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2 Comments

Tim Shelley Over a year ago

Excellent.. thank you for you reply. nice simple solution!

Brian Rogers Over a year ago

No problem. Glad to help.

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