Extracting a JSON object from a serialized value

Below is a simple C# class object that I want to convert into a JSON string:

public class SampleObject
{
    public SampleObject()
    {
        Name = "Hello";
        State = 7;
    }

    public string Name { get; set; }
    public int State { get; set; }
}

I am using the following method to serialize the object into JSON:

    // Json.net
    // from Newtonsoft.Json.dll
    // version 8.0.2.19309
    //

    using Newtonsoft.Json;  
    public static string ConvertToJSON<T>(T obj)
    {
        return JsonConvert.SerializeObject(obj);
    }

The output of this serialization method is as expected:

    {"Name":"Hello","State":7}

To further stringify my JSON string, I use another method:

    public static string Stringify(string json)
    {
        return JsonConvert.ToString(json);
    }

The resulting output of this second method is as anticipated:

    "{\"Name\":\"Hello\",\"State\":7}"

Now, my question is how do I deserialize this string back to the original SampleObject?

My attempts at solving this:

ATTEMPT 1

    public static T ConvertFromStringifiedJSON<T>(string stringifiedJSON)
    {
        Newtonsoft.Json.Linq.JObject j = Newtonsoft.Json.Linq.JObject.Parse(stringifiedJSON);
        return ConvertFromJSON<T>(j.ToString());
    }

However, this attempt throws an exception:

    {"Error reading JObject from JsonReader. Current JsonReader item is not an object: String. Path '', line 1, position 34."}

ATTEMPT 2

    public static T ConvertFromJSON<T>(string jsonNotation)
    {
        return JsonConvert.DeserializeObject<T>(jsonNotation, NoNullStrings);
    }

Unfortunately, this attempt also results in an exception:

    {"Error converting value \"{\"Name\":\"Hello\",\"State\":7}\" to type 'RestApi.Objects.rTestObject'. Path '', line 1, position 34."}

Solution:

Credit to Alexander I. for suggesting the following solution:

    public static T ConvertFromStringifiedJSON<T>(string stringifiedJSON)
    {
        var json = JsonConvert.DeserializeObject<string>(stringifiedJSON);
        return ConvertFromJSON<T>(json);
    }

Answer №1

Kindly examine the following example:

class Application
    {
        static void Main(string[] parameters)
        {
            var sample = new SampleObject
            {
                Label = "Greetings",
                Status = 7
            };

            var jsonOutput = ConvertToJSON(sample);
            var stringifyOutput = StringifyData(jsonOutput);

            var finalResult = ParseToObject<SampleObject>(stringifyOutput);
        }

        public static string ConvertToJSON<T>(T obj)
        {
            return JsonConvert.SerializeObject(obj);
        }

        public static string StringifyData(string jsonData)
        {
            return JsonConvert.ToString(jsonData);
        }

        public static T ParseToObject<T>(string strData)
        {
            var jsonValue = JsonConvert.DeserializeObject<string>(strData);
             var resultValue = JsonConvert.DeserializeObject<T>(jsonValue);
             return resultValue;
        }
    }

    public class SampleObject
    {
        public SampleObject()
        {
            Label = "Hello";
            Status = 0;
        }

        public string Label { get; set; }
        public int Status { get; set; }
    }

Focus on the ParseToObject method.

  1. Convert a stringified string to a JSON string
  2. Deserialize a JSON string to an object

Answer №2

As mentioned by @ne1410, the recommended approach is to utilize:

JsonConvert.DeserializeObject<rTestObject>(myJsonString);

No need to convert your Json object to a string, as indicated by the return type of JsonConvert.SerializeObject(obj)

In my opinion, there is no necessity for additional methods.

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