How to create JSON string in C

Question

I just used the XmlWriter to create some XML to send back in an HTTP response   How would you create a JSON string   I assume you would just use a stringbuilder to build the JSON string and them format your response as JSON

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If you can t or don t want to use the two built-in JSON serializers  JavaScriptSerializer and DataContractJsonSerializer  you can try the JsonExSerializer library - I use it in a number of projects and works quite well

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I ve found that you don t need the serializer at all  If you return the object as a List  Let me use an example   In our asmx we get the data using the variable we passed along     return data  WebMethod CacheDuration   180   public List lt latlon gt  GetData int id         var data   from p in db property                 where p id    id                 select new latlon                                     lat   p lat                     lon   p lon                        return data ToList       public class latlon       public string lat   get  set        public string lon   get  set        Then using jquery we access the service  passing along that variable      get latlon function getlatlon propertyid    var mydata     ajax       url   getData asmx GetLatLon       type   POST       data     id        propertyid             async  false      contentType   application json        dataType   json       success  function  data  textStatus  jqXHR               mydata   data             error  function  xmlHttpRequest  textStatus  errorThrown            console log xmlHttpRequest responseText           console log textStatus           console log errorThrown             return mydata        call the function with your data latlondata   getlatlon id     And we get our response     d       type   MapData latlon   lat   40 7031420   lon   -80 6047970

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You could use the JavaScriptSerializer class  check this article to build an useful extension method   Code from article   namespace ExtensionMethods       public static class JSONHelper               public static string ToJSON this object obj                        JavaScriptSerializer serializer   new JavaScriptSerializer                return serializer Serialize obj                      public static string ToJSON this object obj  int recursionDepth                        JavaScriptSerializer serializer   new JavaScriptSerializer                serializer RecursionLimit   recursionDepth              return serializer Serialize obj                       Usage   using ExtensionMethods        List lt Person gt  people   new List lt Person gt                      new Person ID   1  FirstName    Scott   LastName    Gurthie                       new Person ID   2  FirstName    Bill   LastName    Gates                           string jsonString   people ToJSON

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This library is very good for JSON from C   http   james newtonking com pages json-net aspx

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If you need complex result  embedded  create your own structure   class templateRequest       public String   registration ids      public Data data      public class Data               public String message          public String tickerText          public String contentTitle          public Data String message  String tickerText  string contentTitle                        this message   message              this tickerText   tickerText              this contentTitle   contentTitle                                       and then you can obtain JSON string with calling   List lt String gt  ids   new List lt string gt       id1    id2     templateRequest request   new templeteRequest    request registration ids   ids ToArray    request data   new templateRequest Data  Your message    Your ticker    Your content     string json   new JavaScriptSerializer   Serialize request     The result will be like this    json       registration ids      id1     id2      data      message     Your message     tickerText     Your ticket     contentTitle     Your content        Hope it helps

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Using  Newtonsoft Json makes it really easier    Product product   new Product    product Name    Apple   product Expiry   new DateTime 2008  12  28   product Price   3 99M  product Sizes   new string      Small    Medium    Large      string json   JsonConvert SerializeObject product     Documentation  Serializing and Deserializing JSON

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This code snippet uses the DataContractJsonSerializer from System Runtime Serialization Json in  NET 3 5   public static string ToJson lt T gt     this    T value  Encoding encoding        var serializer   new DataContractJsonSerializer typeof T         using  var stream   new MemoryStream                  using  var writer   JsonReaderWriterFactory CreateJsonWriter stream  encoding                         serializer WriteObject writer  value                      return encoding GetString stream ToArray

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The DataContractJSONSerializer will do everything for you with the same easy as the XMLSerializer  Its trivial to use this in a web app  If you are using WCF  you can specify its use with an attribute  The DataContractSerializer family is also very fast

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Take a look at http   www codeplex com json  for the json-net aspx project   Why re-invent the wheel

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If you re trying to create a web service to serve data over JSON to a web page  consider using the ASP NET Ajax toolkit   http   www asp net learn ajax tutorial-05-cs aspx  It will automatically convert your objects served over a webservice to json  and create the proxy class that you can use to connect to it

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You can also try my ServiceStack JsonSerializer it s the fastest  NET JSON serializer at the moment  It supports serializing DataContracts  any POCO Type  Interfaces  Late-bound objects including anonymous types  etc   Basic Example  var customer   new Customer   Name  Joe Bloggs   Age 31    var json   JsonSerializer SerializeToString customer   var fromJson   JsonSerializer DeserializeFromString lt Customer gt  json      Note  Only use Microsofts JavaScriptSerializer if performance is not important to you as I ve had to leave it out of my benchmarks since its up to 40x-100x slower than the other JSON serializers

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Include  using System Text Json  Then serialize your object to serialize like this  JsonSerializer Serialize object to serialize

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Encode Usage  Simple object to JSON Array EncodeJsObjectArray    public class dummyObject       public string fake   get  set        public int id   get  set         public dummyObject                 fake    dummy           id   5             public override string ToString                 StringBuilder sb   new StringBuilder            sb Append               sb Append id           sb Append               sb Append JSONEncoders EncodeJsString fake            sb Append                return sb ToString             dummyObject   dummys   new dummyObject 2   dummys 0    new dummyObject    dummys 1    new dummyObject     dummys 0  fake    mike   dummys 0  id   29   string result   JSONEncoders EncodeJsObjectArray dummys     Result     29  mike    5  dummy     Pretty Usage  Pretty print JSON Array PrettyPrintJson   string extension method  string input     14 4  14   data      5   10 186 122 15     6   10 186 122 16        string result   input PrettyPrintJson      Results is        14     4             14         data                              5            10 186 122 15                            6            10 186 122 16

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Simlpe use of Newtonsoft Json and Newtonsoft Json Linq libraries             Create my object         var my jsondata   new                       Host     sftp myhost gr               UserName    my username               Password    my password               SourceDir     export zip mypath                FileName    my file zip                        Tranform it to Json object         string json data   JsonConvert SerializeObject my jsondata              Print the Json object         Console WriteLine json data              Parse the json object         JObject json object   JObject Parse json data              Print the parsed Json object         Console WriteLine  string json object  Host             Console WriteLine  string json object  UserName             Console WriteLine  string json object  Password             Console WriteLine  string json object  SourceDir             Console WriteLine  string json object  FileName

[c#] How to create JSON string in C#

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