Convert JSON String To C Object

Question

Trying to convert a JSON string into an object in C   Using a really simple test case   JavaScriptSerializer json serializer   new JavaScriptSerializer    object routes list   json serializer DeserializeObject      test     some data          The problem is that routes list never gets set  it s an undefined object  Any ideas

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As tripletdad99 said   var result   JsonConvert DeserializeObject lt T gt  json     but if you don t want to create an extra object you can make it with Dictionary instead  var result   JsonConvert DeserializeObject lt Dictionary lt string  string gt  gt  json serializer

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You can accomplished your requirement easily by using Newtonsoft Json library  I am writing down the one example below have a look into it   Class for the type of object you receive   public class User       public int ID   get  set        public string Name   get  set         Code   static void Main string   args           string json       ID    1    Name      Abdullah             User user   JsonConvert DeserializeObject lt User gt  json          Console ReadKey        this is a very simple way to parse your json

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First you have to include library like   using System Runtime Serialization Json   DataContractJsonSerializer desc   new DataContractJsonSerializer typeof BlogSite    string json       Description     Share knowledge     Name     zahid       using  var ms   new MemoryStream ASCIIEncoding ASCII GetBytes json          BlogSite b    BlogSite desc ReadObject ms       Console WriteLine b Name       Console WriteLine b Description

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Or  you can use the Newtownsoft Json library as follows   using Newtonsoft Json      var result   JsonConvert DeserializeObject lt T gt  json     Where T is your object type that matches your JSON string

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Convert a JSON string into an object in C   Using below test case   its worked for me  Here  MenuInfo  is my C  class object    JsonTextReader reader   null  try       WebClient webClient   new WebClient        JObject result   JObject Parse webClient DownloadString  YOUR URL         reader   new JsonTextReader new System IO StringReader result ToString          reader SupportMultipleContent   true    catch Exception      JsonSerializer serializer   new JsonSerializer    MenuInfo menuInfo   serializer Deserialize lt MenuInfo gt  reader

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add this ddl to reference to your project  System Web Extensions dll  use this namespace  using System Web Script Serialization   public class IdName       public int Id   get  set        public string Name   get  set           string jsonStringSingle      Id   1   Name   Thulasi Ram S    Replace                var entity   new JavaScriptSerializer   Deserialize lt IdName gt  jsonStringSingle       string jsonStringCollection       Id   2   Name   Thulasi Ram S     Id   2   Name   Raja Ram S     Id   3   Name   Ram S     Replace                var collection   new JavaScriptSerializer   Deserialize lt IEnumerable lt IdName gt  gt  jsonStringCollection

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Using dynamic object with JavaScriptSerializer   JavaScriptSerializer serializer   new JavaScriptSerializer     dynamic item   serializer Deserialize lt object gt       test     some data        string test  item  test       test Result    some data

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Newtonsoft is faster than java script serializer      this one depends on the Newtonsoft NuGet package  which is popular and better than the default serializer   one line code solution   var myclass   Newtonsoft Json JsonConvert DeserializeObject lt dynamic gt  Jsonstring    Myclass oMyclass   Newtonsoft Json JsonConvert DeserializeObject lt Myclass gt  Jsonstring

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Another fast and easy way to semi-automate these steps is to    take the JSON you want to parse and paste it here  https   app quicktype io    Change language to C  in the drop down   Update the name in the top left to your class name  it defaults to  Welcome    In visual studio go to Website -  Manage Packages and use NuGet to add Json Net from Newtonsoft  app quicktype io generated serialize methods based on Newtonsoft   Alternatively  you can now use code like   WebClient client   new WebClient     string myJSON   client DownloadString  https   URL FOR JSON com JSON STUFF     var myClass   Newtonsoft Json JsonConvert DeserializeObject myJSON

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Here s a simple class I cobbled together from various posts     It s been tested for about 15 minutes  but seems to work for my purposes  It uses JavascriptSerializer to do the work  which can be referenced in your app using the info detailed in this post   The below code can be run in LinqPad to test it out by    Right clicking on your script tab in LinqPad  and choosing  Query Properties   Referencing the  System Web Extensions dll  in  Additional References   Adding an  Additional Namespace Imports  of  System Web Script Serialization     Hope it helps   void Main       string json               glossary                 title    example glossary            GlossDiv                         title    S              GlossList                             GlossEntry                                 ID    SGML                  ItemNumber   2                           SortAs    SGML                  GlossTerm    Standard Generalized Markup Language                  Acronym    SGML                  Abbrev    ISO 8879 1986                  GlossDef                                     para    A meta-markup language  used to create markup languages such as DocBook                     GlossSeeAlso     GML    XML                                   GlossSee    markup                                                         var d   new JsonDeserializer json     d GetString  glossary title   Dump      d GetString  glossary GlossDiv title   Dump        d GetString  glossary GlossDiv GlossList GlossEntry ID   Dump        d GetInt  glossary GlossDiv GlossList GlossEntry ItemNumber   Dump          d GetObject  glossary GlossDiv GlossList GlossEntry GlossDef   Dump         d GetObject  glossary GlossDiv GlossList GlossEntry GlossDef GlossSeeAlso   Dump       d GetObject  Some Path That Doesnt Exist Or Another   Dump              Define other methods and classes here  public class JsonDeserializer     private IDictionary lt string  object gt  jsonData   get  set       public JsonDeserializer string json          var json serializer   new JavaScriptSerializer         jsonData    IDictionary lt string  object gt  json serializer DeserializeObject json          public string GetString string path          return  string  GetObject path          public int  GetInt string path          int  result   null       object o   GetObject path       if  o    null              return result             if  o is string              result   Int32 Parse  string o             else             result    Int32  o             return result         public object GetObject string path          object result   null       var curr   jsonData      var paths   path Split           var pathCount   paths Count         try             for  int i   0  i  lt  pathCount  i                    var key   paths i           if  i     pathCount - 1                       result   curr key                     else                     curr    IDictionary lt string  object gt  curr key                               catch                Probably means an invalid path  ie object doesn t exist             return result

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You probably don t want to just declare routes list as an object type   It doesn t have a  test property  so you really aren t going to get a nice object back   This is one of those places where you would be better off defining a class or a struct  or make use of the dynamic keyword   If you really want this code to work as you have it  you ll need to know that the object returned by DeserializeObject is a generic dictionary of string object   Here s the code to do it that way   var json serializer   new JavaScriptSerializer    var routes list    IDictionary lt string  object gt  json serializer DeserializeObject      test     some data        Console WriteLine routes list  test       If you want to use the dynamic keyword  you can read how here   If you declare a class or struct  you can call Deserialize instead of DeserializeObject like so   class MyProgram       struct MyObj           public string test   get  set               static void Main string   args            var json serializer   new JavaScriptSerializer            MyObj routes list   json serializer Deserialize lt MyObj gt       test     some data                Console WriteLine routes list test            Console WriteLine  Done               Console ReadKey true

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It looks like you re trying to deserialize to a raw object   You could create a Class that represents the object that you re converting to   This would be most useful in cases where you re dealing with larger objects or JSON Strings   For instance     class Test          String test          String getTest     return test          void setTest String test    this test   test           Then your deserialization code would be      JavaScriptSerializer json serializer   new JavaScriptSerializer       Test routes list               Test json serializer DeserializeObject      test     some data          More information can be found in this tutorial  http   www codeproject com Tips 79435 Deserialize-JSON-with-Csharp aspx

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Copy your Json and paste at textbox on json2csharp and click on Generate button   A cs class will be generated use that cs file as below  var generatedcsResponce   JsonConvert DeserializeObject yourJson     Where RootObject is the name of the generated cs file

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Let s assume you have a class name Student it has following fields and it has a method which will take JSON as a input and return a string Student Object We can use JavaScriptSerializer here Convert JSON String To C  Object std is a JSON string here    public class Student      public string FirstName  get set      public string LastName  get set      public int   Grades  get set      public static Student ConvertToStudent string std      var serializer   new JavaScriptSerializer       Return serializer Deserialize lt Student gt  std

[c#] Convert JSON String To C# Object

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