How to deserialize json object into class

Question

I have the following json string:

 private const string Json = @"{ 'responseMessage': '', 'response': 'PASS', 'responseData': { 'user': { 'initials': 'XXX', 'name': 'XXXX XXXX', 'companies': [ '0002', '0007', '0022', '0033', '9999' ], 'employee': 'XXXX' } }, 'responseFor': 'myCommand' }'";

My ServerResponse class looks like this:

[JsonObject(MemberSerialization.OptIn)] public class ServerResponse { [JsonProperty("responseFor")] public string ResponseFor { get; set; } [JsonProperty("responseData")] public string ResponseData { get; set; } [JsonProperty("response")] public string Response { get; set; } [JsonProperty("responseMessage")] public string ResponseMessage { get; set; } }

I call this command:

var serverResponse = JsonConvert.DeserializeObject<ServerResponse>(Json);

I would expect that this would fill in my serverResponse object but instead I get this exception:

{Newtonsoft.Json.JsonReaderException: Error reading string. Unexpected token: StartObject. Path 'responseData', line 4, position 30. at Newtonsoft.Json.JsonReader.ReadAsStringInternal () [0x00000] in <filename unknown>:0 at Newtonsoft.Json.JsonTextReader.ReadAsString () [0x00000] in <filename unknown>:0 at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType (Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonContract contract, Boolean hasConverter) [0x00000] in <filename unknown>:0 at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject (System.Object newObject, Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, System.String id) [0x00000] in <filename unknown>:0 }

What am I doing wrong here??

responseData is not a string, it's an object with several fields. — Jeroen Vannevel
– Jeroen Vannevel, Commented Feb 19, 2015 at 22:44
What would I define ResponseData as in my ServerResponse class? I already tried List<string> ResponseData. — PkL728
– PkL728, Commented Feb 19, 2015 at 22:47
It's not a list of strings. It's an object. With fields. As I stated. — Jeroen Vannevel
– Jeroen Vannevel, Commented Feb 19, 2015 at 22:48
I am presently doing something like this: var jsonServerResponse = JObject.Parse(response); which works it just feels ugly because I need to do things like var responseData = JObject.Parse(jsonServerResponse["responseData"].ToString()); — PkL728
– PkL728, Commented Feb 19, 2015 at 22:55

Ryan · Accepted Answer · 2015-02-19 22:56:11Z

You need a class for ResponseData in order for the serialization to work, as the value for it in your json is not a string. You'll also need one for User.

Create response data and user classes that looks something like this.

[JsonObject(MemberSerialization.OptIn)] public class User { [JsonProperty("initials")] public string Initials { get; set; } [JsonProperty("name")] public string Name { get; set; } [JsonProperty("companies")] public string[] Companies { get; set; } [JsonProperty("responseMessage")] public string ResponseMessage { get; set; } } [JsonObject(MemberSerialization.OptIn)] public class ResponseData { [JsonProperty("user")] public User User { get; set; } [JsonProperty("employee")] public string Employee { get; set; } }

Then in your ServerResponse class, change ResponseData to use this ResponseData class.

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