Deserialize JSON with C

Question

I m trying to deserialize a Facebook friend s Graph API  call into a list of objects  The JSON object looks like     data     id   518523721   name   ftyft               id   527032438   name   ftyftyf               id   527572047   name   ftgft               id   531141884   name   ftftft               id   532652067   name      List lt EFacebook gt  facebooks   new JavaScriptSerializer   Deserialize lt List lt EFacebook gt  gt  result     It s not working  because the primitive object is invalid  How can I deserialize this

User · Answer

Newtonsoft JSON is a good solution for these kind of situations  Also Newtonsof JSON is faster than others  such as JavaScriptSerializer  DataContractJsonSerializer   In this sample  you can the following   var jsonData   JObject Parse  your JSON data here      Then you can cast jsonData to JArray  and you can use a for loop to get data at each iteration   Also  I want to add something   for  int i   0   JArray jsonData  data   Count  i          var data   jsonData i - 1       Working with dynamic object and using Newtonsoft serialize is a good choice

User · Answer

Serialization      Convert an object to JSON string format string jsonData   JsonConvert SerializeObject obj    Response Write jsonData     Deserialization    To deserialize a dynamic object    string json              Name    name          Description    des           var res   JsonConvert DeserializeObject lt  dynamic gt  json    Response Write res Name

User · Answer

I agree with Icarus  would have commented if I could   but instead of using a CustomObject class  I would use a Dictionary  in case Facebook adds something    private class MyFacebookClass       public IList lt IDictionary lt string  string gt  gt  data   get  set        or  private class MyFacebookClass       public IList lt IDictionary lt string  object gt  gt  data   get  set

User · Answer

Very easily we can parse JSON content with the help of dictionary and JavaScriptSerializer  Here is the sample code by which I parse JSON content from an ashx file   var jss   new JavaScriptSerializer    string json   new StreamReader context Request InputStream  ReadToEnd    Dictionary lt string  string gt  sData   jss Deserialize lt Dictionary lt string  string gt  gt  json   string  Name   sData  Name   ToString    string  Subject   sData  Subject   ToString    string  Email   sData  Email   ToString    string  Details   sData  Details   ToString

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Sometimes I prefer dynamic objects   public JsonResult GetJson       string res    WebClient client   new WebClient          Download string   string value   client DownloadString  https   api instagram com v1 users 000000000 media recent  client id clientId          Write values   res   value    dynamic dyn   JsonConvert DeserializeObject res     var lstInstagramObjects   new List lt InstagramModel gt        foreach var obj in dyn data          lstInstagramObjects Add new InstagramModel               Link    obj link    null    obj link ToString               VideoUrl    obj videos    null    obj videos standard resolution url ToString               CommentsCount   int Parse obj comments count ToString           LikesCount   int Parse obj likes count ToString           CreatedTime   new System DateTime 1970  1  1  0  0  0  0  AddSeconds  double Parse obj created time ToString             ImageUrl    obj images    null    obj images standard resolution url ToString               User   new InstagramModel UserAccount                                 username   obj user username                 website   obj user website                 profile picture   obj user profile picture                 full name   obj user full name                 bio   obj user bio                 id   obj user id                               return Json lstInstagramObjects  JsonRequestBehavior AllowGet

User · Answer

If you re using  NET Core 3 0  you can use System Text Json  which is now built-in  to deserialize JSON   The first step is to create classes to model the JSON   There are many tools which can help with this  and some of the answers here list them   Some options are http   json2csharp com  http   app quicktype io  or use Visual Studio  menu Edit  rarr  Paste Special  rarr  Paste JSON as classes    public class Person       public string Id   get  set        public string Name   get  set       public class Response       public List lt Person gt  Data   get  set        Then you can deserialize using   var people   JsonSerializer Deserialize lt Response gt  json       If you need to add settings  such as camelCase handling  then pass serializer settings into the deserializer like this   var options   new JsonSerializerOptions     PropertyNamingPolicy   JsonNamingPolicy CamelCase    var person   JsonSerializer Deserialize lt Response gt  json  options

User · Answer

You can use this extensions  public static class JsonExtensions      public static T ToObject lt T gt  this string jsonText              return JsonConvert DeserializeObject lt T gt  jsonText            public static string ToJson lt T gt  this T obj              return JsonConvert SerializeObject obj

User · Answer

A great way to automatically generate these classes for you is to copy your JSON output and throw it in here   http   json2csharp com   It will provide you with a starting point to touch up your classes for deserialization

User · Answer

Here is another site that will help you with all the code you need as long as you have a correctly formated JSON string available   https   app quicktype io

User · Answer

You need to create a structure like this   public class Friends        public List lt FacebookFriend gt  data  get  set      public class FacebookFriend        public string id  get  set       public string name  get  set       Then you should be able to do   Friends facebookFriends   new JavaScriptSerializer   Deserialize lt Friends gt  result     The names of my classes are just an example  You should use proper names   Adding a sample test   string json            data       id     518523721     name     ftyft        id     527032438     name     ftyftyf        id     527572047     name     ftgft        id     531141884     name     ftftft         Friends facebookFriends   new System Web Script Serialization JavaScriptSerializer   Deserialize lt Friends gt  json    foreach var item in facebookFriends data        Console WriteLine  id   0   name   1    item id  item name       Produces   id  518523721  name  ftyft id  527032438  name  ftyftyf id  527572047  name  ftgft id  531141884  name  ftftft

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