How to parse JSON without JSON NET library

Question

I m trying to build a Metro application for Windows 8 on Visual Studio 2011  and while I m trying to do that  I m having some issues on how to parse JSON without JSON NET library  It doesn t support the metro applications yet    Anyway  I want to parse this         name   Prince Charming       artist   Metallica       genre   Rock and Metal       album   Reload       album image   http     up203 siz co il  up2  u2zzzw4mjayz png       link   http     f2h co il  7779182246886

User · Answer

You can use DataContractJsonSerializer  See this link for more details

User · Answer

You can use the classes found in the System Json Namespace which were added in  NET 4 5  You need to add a reference to the System Runtime Serialization assembly  The JsonValue Parse   Method parses JSON text and returns a JsonValue   JsonValue value   JsonValue Parse       name     Prince Charming             If you pass a string with a JSON object  you should be able to cast the value to a JsonObject   using System Json    JsonObject result   value as JsonObject   Console WriteLine  Name       0     string result  name     Console WriteLine  Artist     0     string result  artist     Console WriteLine  Genre      0     string result  genre     Console WriteLine  Album      0     string result  album       The classes are quite similar to those found in the System Xml Linq Namespace

User · Answer

Have you tried using JavaScriptSerializer   There s also DataContractJsonSerializer

User · Answer

using System  using System IO  using System Runtime Serialization Json  using System Text   namespace OTL            lt summary gt          Before usage  Define your class  sample           DataContract         public class MusicInfo                     DataMember Name  quot music name quot              public string Name   get  set               DataMember            public string Artist get  set                     lt  summary gt           lt typeparam name  quot T quot  gt  lt  typeparam gt      public class OTLJSON lt T gt  where T   class                    lt summary gt              Serializes an object to JSON             Usage  string serialized   OTLJSON amp lt MusicInfo amp gt  Serialize musicInfo                lt  summary gt               lt param name  quot instance quot  gt  lt  param gt               lt returns gt  lt  returns gt          public static string Serialize T instance                        var serializer   new DataContractJsonSerializer typeof T                using  var stream   new MemoryStream                                  serializer WriteObject stream  instance                   return Encoding Default GetString stream ToArray                                           lt summary gt              DeSerializes an object from JSON             Usage   MusicInfo deserialized   OTLJSON amp lt MusicInfo amp gt  Deserialize json                lt  summary gt               lt param name  quot json quot  gt  lt  param gt               lt returns gt  lt  returns gt          public static T Deserialize string json                        if  string IsNullOrEmpty json                   throw new Exception  quot Json can t empty quot                else                 try                                       using  var stream   new MemoryStream Encoding Default GetBytes json                                                   var serializer   new DataContractJsonSerializer typeof T                            return serializer ReadObject stream  as T                                                          catch  Exception e                                        throw new Exception  quot Json can t convert to Object because it isn t correct format  quot

User · Answer

I use this   but have never done any metro app development  so I don t know of any restrictions on libraries available to you   note  you ll need to mark your classes as with DataContract and DataMember attributes   public static class JSONSerializer lt TType gt  where TType   class            lt summary gt          Serializes an object to JSON          lt  summary gt      public static string Serialize TType instance                var serializer   new DataContractJsonSerializer typeof TType            using  var stream   new MemoryStream                          serializer WriteObject stream  instance               return Encoding Default GetString stream ToArray                               lt summary gt          DeSerializes an object from JSON          lt  summary gt      public static TType DeSerialize string json                using  var stream   new MemoryStream Encoding Default GetBytes json                          var serializer   new DataContractJsonSerializer typeof TType                return serializer ReadObject stream  as TType                      So  if you had a class like this      DataContract  public class MusicInfo        DataMember      public string Name   get  set          DataMember      public string Artist   get  set          DataMember      public string Genre   get  set          DataMember      public string Album   get  set          DataMember      public string AlbumImage   get  set          DataMember      public string Link   get  set         Then you would use it like this     var musicInfo   new MusicInfo        Name    Prince Charming        Artist    Metallica        Genre    Rock and Metal        Album    Reload        AlbumImage    http   up203 siz co il up2 u2zzzw4mjayz png        Link    http   f2h co il 7779182246886         This will produce a JSON String var serialized   JSONSerializer lt MusicInfo gt  Serialize musicInfo       This will produce a copy of the instance you created earlier var deserialized   JSONSerializer lt MusicInfo gt  DeSerialize serialized

User · Answer

For those who do not have 4 5  Here is my library function that reads json  It requires a project reference to System Web Extensions   using System Web Script Serialization   public object DeserializeJson lt T gt  string Json        JavaScriptSerializer JavaScriptSerializer   new JavaScriptSerializer        return JavaScriptSerializer Deserialize lt T gt  Json       Usually  json is written out based on a contract  That contract can and usually will be codified in a class  T   Sometimes you can take a word from the json and search the object browser to find that type   Example usage   Given the json    logEntries      value   My Code   text   My Text   enabled  true  checkedIndices      checkedItemsTextOverflows  false    You could parse it into a RadComboBoxClientState object like this   string ClientStateJson   Page Request Form  ReportGrid1 cboReportType ClientState    RadComboBoxClientState RadComboBoxClientState   DeserializeJson lt RadComboBoxClientState gt  ClientStateJson   return RadComboBoxClientState Value

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