json - custom javascript deserializer in c# -

i working on c# application has browser integrated it. browser send data c# in json format.

some of fields json can dserialized using javascript deserializer, have data custom deserializer required, need register deserializer thing custom deserializer must called special data , default javascript deserializer must called other data, special data can identified there target field's data type / name in c#. how can achieve this.

something this.

public class example {   public string abc;   public someotherdatatype xyz;    public void example()   {     serializer = new javascriptserializer();      // receive json string          serializer.registerconverters(new javascriptconverter[]          {      new system.web.script.serialization.cs.customconverter()      });      //call deserializer  } } 

the json string

{ "abc" : "valueabc" "xyz" : "valuexyz" } 

now custom deserializer must called during deserializing xyz , default must called abc.

thank you.

the difficulty here javascriptconverter allows map json object , c# class -- in json, "xyz" string, not object. can't specify converter someotherdatatype , instead must specify converters every class contains instance of someotherdatatype.

(note custom converter functionality in json.net not have restriction. if willing switch library write jsonconverter converting uses of someotherdatatype , json string.)

to write such javascriptconverter:

1. override javascriptconverter.deserialize
2. create second dictionary<string, object> filtering out fields requiring custom conversion.
3. call new javascriptserializer.converttotype<t> deserialize standard fields filtered dictionary.
4. manually convert remaining fields.
5. override supportedtypes return container type.

thus, in example, do:

public class example {     public string abc;     public someotherdatatype xyz; }  // example implementation only. public class someotherdatatype {     public string someproperty { get; set; }      public static someotherdatatype createfromjsonobject(object xyzvalue)     {         if (xyzvalue string)         {             return new someotherdatatype { someproperty = (string)xyzvalue };         }         return null;     } }  class exampleconverter : javascriptconverter {     public override ienumerable<type> supportedtypes     {         { return new[] { typeof(example) }; }     }      // custom conversion code below      public override object deserialize(idictionary<string, object> dictionary, type type, javascriptserializer serializer)     {         var defaultdict = dictionary.where(pair => pair.key != "xyz").todictionary(pair => pair.key, pair => pair.value);         var overridedict = dictionary.where(pair => !(pair.key != "xyz")).todictionary(pair => pair.key, pair => pair.value);          // use "fresh" javascriptserializer here avoid infinite recursion.         var value = (example)new javascriptserializer().converttotype<example>(defaultdict);          object xyzvalue;         if (overridedict.trygetvalue("xyz", out xyzvalue))         {             value.xyz = someotherdatatype.createfromjsonobject(xyzvalue);         }         return value;     }      public override idictionary<string, object> serialize(object obj, javascriptserializer serializer)     {         throw new notimplementedexception();     } } 

and then, test:

public class testclass {     public static void test()     {         // receive json string         string json = @"{ ""abc"" : ""valueabc"", ""xyz"" : ""valuexyz"" }";         var serializer = new javascriptserializer();         serializer.registerconverters(new javascriptconverter[]          {               new exampleconverter()          });          var example = serializer.deserialize<example>(json);         debug.assert(example.abc == "valueabc" && example.xyz.someproperty == "valuexyz"); // no assert     } }