How do I turn a C object into a JSON string in NET

Question

I have classes like these   class MyDate       int year  month  day     class Lad       string firstName      string lastName      MyDate dateOfBirth      And I would like to turn a Lad object into a JSON string like this          firstName   Markoff        lastName   Chaney        dateOfBirth                  year   1901            month   4            day   30             without the formatting   I found this link  but it uses a namespace that s not in  NET 4  I also heard about JSON NET  but their site seems to be down at the moment  and I m not keen on using external DLL files   Are there other options besides manually creating a JSON string writer

User · Answer

Use the below code for converting XML to JSON   var json   new JavaScriptSerializer   Serialize obj

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I would vote for ServiceStack s JSON Serializer  using ServiceStack   string jsonString   new   FirstName    quot James quot    ToJson     It is also the fastest JSON serializer available for  NET  http   www servicestack net benchmarks

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You can achieve this by using Newtonsoft json  Install Newtonsoft json from NuGet  And then   using Newtonsoft Json   var jsonString   JsonConvert SerializeObject obj

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You could use the JavaScriptSerializer class  add reference to System Web Extensions    using System Web Script Serialization      var json   new JavaScriptSerializer   Serialize obj     A full example   using System  using System Web Script Serialization   public class MyDate       public int year      public int month      public int day     public class Lad       public string firstName      public string lastName      public MyDate dateOfBirth     class Program       static void Main                 var obj   new Lad                       firstName    Markoff               lastName    Chaney               dateOfBirth   new MyDate                               year   1901                  month   4                  day   30                                  var json   new JavaScriptSerializer   Serialize obj           Console WriteLine json

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If you are in an ASP NET MVC web controller it s as simple as   string ladAsJson   Json Lad     Can t believe no one has mentioned this

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Use Json Net library  you can download it from Nuget Packet Manager   Serializing to Json String    var obj   new Lad                       firstName    Markoff               lastName    Chaney               dateOfBirth   new MyDate                               year   1901                  month   4                  day   30                           var jsonString   Newtonsoft Json JsonConvert SerializeObject obj     Deserializing to Object   var obj   Newtonsoft Json JsonConvert DeserializeObject lt Lad gt  jsonString

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Wooou  Really better using a JSON framework     Here is my example using Json NET  http   james newtonking com json    using System  using System Collections Generic  using System Text  using Newtonsoft Json  using System IO   namespace com blogspot jeanjmichel jsontest model       public class Contact               private Int64 id          private String name          List lt Address gt  addresses           public Int64 Id                       set   this id   value                get   return this id                       public String Name                       set   this name   value                get   return this name                       public List lt Address gt  Addresses                       set   this addresses   value                get   return this addresses                       public String ToJSONRepresentation                         StringBuilder sb   new StringBuilder                JsonWriter jw   new JsonTextWriter new StringWriter sb                 jw Formatting   Formatting Indented              jw WriteStartObject                jw WritePropertyName  id                jw WriteValue this Id               jw WritePropertyName  name                jw WriteValue this Name                jw WritePropertyName  addresses                jw WriteStartArray                 int i              i   0               for  i   0  i  lt  addresses Count  i                                  jw WriteStartObject                    jw WritePropertyName  id                    jw WriteValue addresses i  Id                   jw WritePropertyName  streetAddress                    jw WriteValue addresses i  StreetAddress                   jw WritePropertyName  complement                    jw WriteValue addresses i  Complement                   jw WritePropertyName  city                    jw WriteValue addresses i  City                   jw WritePropertyName  province                    jw WriteValue addresses i  Province                   jw WritePropertyName  country                    jw WriteValue addresses i  Country                   jw WritePropertyName  postalCode                    jw WriteValue addresses i  PostalCode                   jw WriteEndObject                               jw WriteEndArray                 jw WriteEndObject                 return sb ToString                       public Contact                                public Contact Int64 id  String personName  List lt Address gt  addresses                        this id   id              this name   personName              this addresses   addresses                     public Contact String JSONRepresentation                          To do                     The test   using System  using System Collections Generic  using com blogspot jeanjmichel jsontest model   namespace com blogspot jeanjmichel jsontest main       public class Program               static void Main string   args                        List lt Address gt  addresses   new List lt Address gt                 addresses Add new Address 1   Rua Dr  Fernandes Coelho  85    15   andar    S  o Paulo    S  o Paulo    Brazil    05423040                 addresses Add new Address 2   Avenida Senador Teot  nio Vilela  241   null   S  o Paulo    S  o Paulo    Brazil   null                 Contact contact   new Contact 1   Ayrton Senna   addresses                Console WriteLine contact ToJSONRepresentation                 Console ReadKey                        The result        id   1     name    Ayrton Senna      addresses                  id   1         streetAddress    Rua Dr  Fernandes Coelho  85          complement    15   andar          city    S  o Paulo          province    S  o Paulo          country    Brazil          postalCode    05423040                      id   2         streetAddress    Avenida Senador Teot  nio Vilela  241          complement   null         city    S  o Paulo          province    S  o Paulo          country    Brazil          postalCode   null               Now I will implement the constructor method that will receives a JSON string and populates the class  fields

User · Answer

It is as easy as this  it works for dynamic objects as well  type object     string json   new System Web Script Serialization JavaScriptSerializer   Serialize MYOBJECT

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Serializer   public static void WriteToJsonFile lt T gt  string filePath  T objectToWrite  bool append   false  where T   new             var contentsToWriteToFile   JsonConvert SerializeObject objectToWrite  new JsonSerializerSettings                       Formatting   Formatting Indented                      using  var writer   new StreamWriter filePath  append                         writer Write contentsToWriteToFile                 Object  namespace MyConfig       public class AppConfigurationSettings               public AppConfigurationSettings                            initialize the object if you want to output a new document                for use as a template or default settings possibly when                 an app is started                              if  AppSettings    null    AppSettings new AppSettings                        public AppSettings AppSettings   get  set               public class AppSettings               public bool DebugMode   get  set      false            Implementation  var jsonObject   new AppConfigurationSettings    WriteToJsonFile lt AppConfigurationSettings gt  file FullName  jsonObject     Output       AppSettings          DebugMode   false

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Since we all love one-liners      this one depends on the Newtonsoft NuGet package  which is popular and better than the default serializer   Newtonsoft Json JsonConvert SerializeObject new  foo    bar      Documentation  Serializing and Deserializing JSON

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In your Lad model class  add an override to the  ToString   method that returns a JSON string version of your Lad object  Note  you will need to import System Text Json  using System Text Json   class MyDate       int year  month  day     class Lad       public string firstName   get  set         public string lastName   get  set         public MyDate dateOfBirth   get  set         public override string ToString     gt  JsonSerializer Serialize lt Lad gt  this

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A new JSON serializer is available in the System Text Json namespace  It s included in the  NET Core 3 0 shared framework and is in a NuGet package for projects that target  NET Standard or  NET Framework or  NET Core 2 x    Example code   using System  using System Text Json   public class MyDate       public int year   get  set        public int month   get  set        public int day   get  set       public class Lad       public string FirstName   get  set        public string LastName   get  set        public MyDate DateOfBirth   get  set       class Program       static void Main                 var lad   new Lad                       FirstName    Markoff               LastName    Chaney               DateOfBirth   new MyDate                               year   1901                  month   4                  day   30                                  var json   JsonSerializer Serialize lad           Console WriteLine json             In this example the classes to be serialized have properties rather than fields  the System Text Json serializer currently doesn t serialize fields   Documentation    System Text Json overview How to use System Text Json

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If they are not very big  what s probably your case export it as JSON   Also this makes it portable among all platforms   using Newtonsoft Json    TestMethod  public void ExportJson         double    b   new double                            110   120   130   140  150                 1110  1120  1130  1140  1150                1000     1    5      9  1000                1110     2    6     10  1110                1220     3    7     11  1220                1330     4    8     12  1330                  string jsonStr   JsonConvert SerializeObject b        Console WriteLine jsonStr        string path    X   Programming  workspaceEclipse  PyTutorials  src  tensorflow tutorials  export txt        File WriteAllText path  jsonStr

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Use these tools for generating a C  class  and then use this code to serialize your object    var json   new JavaScriptSerializer   Serialize obj

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Use the DataContractJsonSerializer class  MSDN1  MSDN2   My example  HERE   It can also safely deserialize objects from a JSON string  unlike JavaScriptSerializer  But personally I still prefer Json NET

[c#] How do I turn a C# object into a JSON string in .NET?

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