title: Deserialization of a JSON string returns null values
body: <p>I am trying to deserialize a JSON string and get null values. I have tried to deserialize with: DataContractJsonSerializer, JavaScriptSerializer, JsonConvert.</p>
  
  <p>This Object returns null: RootObject gr = JsonConvert.DeserializeObject(responseJson);         </p>
  
  <pre><code>string apiUrl = "http://data.posccaesar.org/rdl/?output=json&amp;query=%23queryinterface%23%0APREFIX+owl:+%3Chttp:%2F%2Fwww.w3.org%2F2002%2F07%2Fowl%23%3E%0APREFIX+rdf:+%3Chttp:%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0APREFIX+rdfs:++%3Chttp:%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E%0APREFIX+xsd:+%3Chttp:%2F%2Fwww.w3.org%2F2001%2FXMLSchema%23%3E%0APREFIX+fn:+%3Chttp:%2F%2Fwww.w3.org%2F2005%2Fxpath-functions%23%3E%0APREFIX+p2:+%3Chttp:%2F%2Frds.posccaesar.org%2F2008%2F02%2FOWL%2FISO-15926-2_2003%23%3E%0APREFIX+rds:+%3Chttp:%2F%2Frdl.rdlfacade.org%2Fdata%23%3E%0APREFIX+afn:+%3Chttp:%2F%2Fjena.hpl.hp.com%2FARQ%2Ffunction%23%3E%0APREFIX+dc:+%3Chttp:%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0A%0APREFIX+rdl:+%3Chttp:%2F%2Fdata.posccaesar.org%2Frdl%2F%3E%0APREFIX+ptrn:+%3Chttp:%2F%2Fdata.posccaesar.org%2Fptrn%2F%3E%0A%0Aselect+%3Fsub+%3Flabel+where+%7B%0A%09%3Fa+p2:hasSuperclass+rdl:RDS608876181+;%0A%09p2:hasSubclass+%3Fsub.%0A%09%3Fsub+rdfs:label+%3Flabel.%0A%7D%0Alimit+1000%0A";
  var jsonPayload = new { seriesid = new[] { "LAUCN040010000000005", "LAUCN040010000000006" } };
  string requestJson = JsonConvert.SerializeObject(jsonPayload);
  string responseJson = string.Empty;
  
  using (WebClient client = new WebClient())
  {
      byte[] response = client.UploadData(apiUrl, Encoding.UTF8.GetBytes(requestJson));
      responseJson = Encoding.UTF8.GetString(response);
  }
  
  RootObject gr = JsonConvert.DeserializeObject&lt;RootObject&gt;(responseJson);
  </code></pre>
  
  <p>I generate class from <a href="http://json2csharp.com/" rel="nofollow noreferrer">http://json2csharp.com/</a> I got as below.</p>
  
  <pre><code> using System.Collections.Generic;
   public class Graph
   {
      public string @id { get; set; }
      public string @type { get; set; }
      public string defaultRdsId { get; set; }
      public string hasCreationDate { get; set; }
      public string hasCreator { get; set; }
      public string hasDefinition { get; set; }
      public string hasDesignation { get; set; }
      public string hasIdPCA { get; set; }
      public string hasStatus { get; set; }
      public string label { get; set; }
      public string sameAs { get; set; }
      public string hasDesignationAbbrev { get; set; }
      public string hasNote { get; set; }
      public string hasRegistrar { get; set; }
      public string hasRegistrarAuth { get; set; }
      public string hasSubclass { get; set; }
      public string hasSuperclass { get; set; }
      public string rdsWipEquivalent { get; set; }
  }
  
  public class SameAs
  {
      public string @id { get; set; }
      public string @type { get; set; }
  }
  
  public class HasSuperclass
  {
      public string @id { get; set; }
      public string @type { get; set; }
  }
  
  public class HasSubclass
  {
      public string @id { get; set; }
      public string @type { get; set; }
  }
  
  public class RdsWipEquivalent
  {
      public string @id { get; set; }
      public string @type { get; set; }
  }
  
  public class Context
  {
      public string hasDesignation { get; set; }
      public string hasNote { get; set; }
      public string hasCreator { get; set; }
      public string hasDefinition { get; set; }
      public string label { get; set; }
      public string hasIdPCA { get; set; }
      public string hasCreationDate { get; set; }
      public string hasStatus { get; set; }
      public string defaultRdsId { get; set; }
      public string hasDesignationAbbrev { get; set; }
      public SameAs sameAs { get; set; }
      public HasSuperclass hasSuperclass { get; set; }
      public HasSubclass hasSubclass { get; set; }
      public string hasRegistrarAuth { get; set; }
      public string hasRegistrar { get; set; }
      public RdsWipEquivalent rdsWipEquivalent { get; set; }
      public string rds { get; set; }
      public string p2 { get; set; }
      public string owl { get; set; }
      public string rdf { get; set; }
      public string afn { get; set; }
      public string xsd { get; set; }
      public string fn { get; set; }
      public string oldrdl { get; set; }
      public string rdfs { get; set; }
      public string rdl { get; set; }
      public string list { get; set; }
      public string dc { get; set; }
  }
  
  public class RootObject
  {
      public List&lt;Graph&gt; @graph { get; set; }
      public Context @context { get; set; }
  }
  </code></pre>
  
  <p>My JSON string:</p>
  
  <pre><code>{
    "@graph" : [ {
      "@id" : "rdl:RDS14186420",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R59065461445",
      "hasCreationDate" : "2003.10.30",
      "hasCreator" : "u83130",
      "hasDefinition" : "A component class whose members are classes of electrical heater components.",
      "hasDesignation" : "ELECTRICAL HEATER COMPONENT CLASS",
      "hasIdPCA" : "RDS14186420",
      "hasStatus" : "Recorded",
      "label" : "ELECTRICAL HEATER COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS14186420"
    }, {
      "@id" : "rdl:RDS15378839",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R36079680064",
      "hasCreationDate" : "2004.05.18",
      "hasCreator" : "u82237",
      "hasDefinition" : "A class whose members are intended to form part of a ship hull or other structural parts.",
      "hasDesignation" : "SHIP STRUCTURAL COMPONENT CLASS",
      "hasIdPCA" : "RDS15378839",
      "hasStatus" : "Recorded",
      "label" : "SHIP STRUCTURAL COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS15378839"
    }, {
      "@id" : "rdl:RDS17055682",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R90167534107",
      "hasCreationDate" : "2005.09.30",
      "hasCreator" : "u20683",
      "hasDefinition" : "Classes of machine components that forms part of of a drilling fluid powered downhole drilling motor.",
      "hasDesignation" : "DOWNHOLE DRILLING MOTOR COMPONENT CLASS",
      "hasIdPCA" : "RDS17055682",
      "hasStatus" : "Recorded",
      "label" : "DOWNHOLE DRILLING MOTOR COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS17055682"
    }, {
      "@id" : "rdl:RDS17056232",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R87192971881",
      "hasCreationDate" : "2005.11.08",
      "hasCreator" : "u20683",
      "hasDefinition" : "The class \"heat exchanger component class\" is the subclass of the class \"mechanical equipment class\" that contains each mechanical equipment component class for which each member can be a component of a heat exchanger.",
      "hasDesignation" : "HEAT EXCHANGER COMPONENT CLASS",
      "hasDesignationAbbrev" : "1705623200",
      "hasIdPCA" : "RDS17056232",
      "hasNote" : "A more informal definition is \"A heat exchanger component class is a heat transfer equipment component class that has members which can be components of a heat exchanger\".",
      "hasStatus" : "Incomplete",
      "label" : "HEAT EXCHANGER COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS17056232"
    }, {
      "@id" : "rdl:RDS17056700",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R36377127353",
      "hasCreationDate" : "2005.10.05",
      "hasCreator" : "u82237",
      "hasDefinition" : "A component class whose members are classes of parts of classes of process plant equipment.",
      "hasDesignation" : "EQUIPMENT COMPONENT CLASS",
      "hasIdPCA" : "RDS17056700",
      "hasStatus" : "Incomplete",
      "label" : "EQUIPMENT COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS17056700"
    }, {
      "@id" : "rdl:RDS201644",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R30951219061",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "A class whose members are classes of artefacts.",
      "hasDesignation" : "ARTEFACT CLASS",
      "hasIdPCA" : "RDS201644",
      "hasRegistrar" : "mvsen",
      "hasRegistrarAuth" : "RDS",
      "hasStatus" : "Qualified",
      "label" : "ARTEFACT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS201644"
    }, {
      "@id" : "rdl:RDS201914",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R58281768156",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "Classes of machine components that forms parts of a coupling.",
      "hasDesignation" : "POWER TRANSMISSION COUPLING COMPONENT CLASS",
      "hasIdPCA" : "RDS201914",
      "hasStatus" : "Recorded",
      "label" : "POWER TRANSMISSION COUPLING COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS201914"
    }, {
      "@id" : "rdl:RDS203399",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R51597621609",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "Classes of instrument components that forms parts of an instrument",
      "hasDesignation" : "INSTRUMENT COMPONENT CLASS",
      "hasIdPCA" : "RDS203399",
      "hasStatus" : "Recorded",
      "label" : "INSTRUMENT COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS203399"
    }, {
      "@id" : "rdl:RDS203489",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R15440214689",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "A heating, ventilation and air conditioning (HVAC) equipment class that contains classes of equipment used as parts of HVAC equipment",
      "hasDesignation" : "HVAC COMPONENT CLASS",
      "hasIdPCA" : "RDS203489",
      "hasStatus" : "Recorded",
      "label" : "HVAC COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS203489"
    }, {
      "@id" : "rdl:RDS203534",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R29782655361",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "A rotating mechanical equipment class that contains classes of machine components that forms parts of a pump.",
      "hasDesignation" : "PUMP COMPONENT CLASS",
      "hasIdPCA" : "RDS203534",
      "hasStatus" : "Recorded",
      "label" : "PUMP COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS203534"
    }, {
      "@id" : "rdl:RDS220589",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R39099110350",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "Classes of components that forms parts of a gearbox.",
      "hasDesignation" : "GEARBOX COMPONENT CLASS",
      "hasIdPCA" : "RDS220589",
      "hasStatus" : "Recorded",
      "label" : "GEARBOX COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS220589"
    }, {
      "@id" : "rdl:RDS224684",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R90018669619",
      "hasCreationDate" : "2005.10.25",
      "hasCreator" : "u83130",
      "hasDefinition" : "A valve equipment class that contains classes of valve components or parts used in pumps and pump assemblies. Only to be used during the classification of valves.",
      "hasDesignation" : "VALVE COMPONENT CLASS",
      "hasIdPCA" : "RDS224684",
      "hasStatus" : "Incomplete",
      "label" : "VALVE COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS224684"
    }, {
      "@id" : "rdl:RDS225314",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R60279376190",
      "hasCreationDate" : "2006.06.15",
      "hasCreator" : "u20683",
      "hasDefinition" : "A process piping equipment class that contains classes of equipment used in or in connection with a piping system.",
      "hasDesignation" : "PIPING COMPONENT CLASS",
      "hasIdPCA" : "RDS225314",
      "hasStatus" : "Recorded",
      "label" : "PIPING COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS225314"
    }, {
      "@id" : "rdl:RDS226124",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R20688513774",
      "hasCreationDate" : "2001.10.16",
      "hasCreator" : "u82237",
      "hasDefinition" : "Classes of components that forms parts of a mechanical seal.",
      "hasDesignation" : "MECHANICAL SEAL COMPONENT CLASS",
      "hasIdPCA" : "RDS226124",
      "hasStatus" : "Recorded",
      "label" : "MECHANICAL SEAL COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS226124"
    }, {
      "@id" : "rdl:RDS608876181",
      "@type" : "p2:ClassOfClassOfIndividual",
      "defaultRdsId" : "R63534165926",
      "hasCreationDate" : "2007.10.22",
      "hasCreator" : "mvsen",
      "hasDefinition" : "An artefact class whose members are suitable as a part of a larger artefact.",
      "hasDesignation" : "COMPONENT CLASS",
      "hasIdPCA" : "RDS608876181",
      "hasStatus" : "Incomplete",
      "label" : "COMPONENT CLASS",
      "sameAs" : "http://posccaesar.org/rdl/RDS608876181"
    }, {
      "@id" : "rdl:RDS608877101",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R29442817194",
      "hasIdPCA" : "RDS608877101",
      "hasSubclass" : "rdl:RDS608876181",
      "hasSuperclass" : "rdl:RDS201644",
      "sameAs" : "http://posccaesar.org/rdl/RDS608877101"
    }, {
      "@id" : "rdl:RDS608880141",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R72593201380",
      "hasIdPCA" : "RDS608880141",
      "hasSubclass" : "rdl:RDS14186420",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS608880141"
    }, {
      "@id" : "rdl:RDS609008651",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R61353051370",
      "hasIdPCA" : "RDS609008651",
      "hasSubclass" : "rdl:RDS17055682",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609008651"
    }, {
      "@id" : "rdl:RDS609008911",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R72794538375",
      "hasIdPCA" : "RDS609008911",
      "hasSubclass" : "rdl:RDS17056700",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609008911"
    }, {
      "@id" : "rdl:RDS609009131",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R91377360705",
      "hasIdPCA" : "RDS609009131",
      "hasSubclass" : "rdl:RDS220589",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609009131"
    }, {
      "@id" : "rdl:RDS609009331",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R68426307879",
      "hasIdPCA" : "RDS609009331",
      "hasSubclass" : "rdl:RDS17056232",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609009331"
    }, {
      "@id" : "rdl:RDS609009541",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R55261332198",
      "hasIdPCA" : "RDS609009541",
      "hasSubclass" : "rdl:RDS203489",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609009541"
    }, {
      "@id" : "rdl:RDS609009681",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R10066878943",
      "hasIdPCA" : "RDS609009681",
      "hasSubclass" : "rdl:RDS203399",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609009681"
    }, {
      "@id" : "rdl:RDS609009931",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R91203774026",
      "hasIdPCA" : "RDS609009931",
      "hasSubclass" : "rdl:RDS226124",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609009931"
    }, {
      "@id" : "rdl:RDS609011171",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R58289922054",
      "hasIdPCA" : "RDS609011171",
      "hasSubclass" : "rdl:RDS225314",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609011171"
    }, {
      "@id" : "rdl:RDS609011401",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R40124754568",
      "hasIdPCA" : "RDS609011401",
      "hasSubclass" : "rdl:RDS201914",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609011401"
    }, {
      "@id" : "rdl:RDS609011651",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R65525751798",
      "hasIdPCA" : "RDS609011651",
      "hasSubclass" : "rdl:RDS203534",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609011651"
    }, {
      "@id" : "rdl:RDS609011921",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R35776609616",
      "hasIdPCA" : "RDS609011921",
      "hasSubclass" : "rdl:RDS15378839",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609011921"
    }, {
      "@id" : "rdl:RDS609012311",
      "@type" : "p2:Specialization",
      "defaultRdsId" : "R91523122738",
      "hasIdPCA" : "RDS609012311",
      "hasSubclass" : "rdl:RDS224684",
      "hasSuperclass" : "rdl:RDS608876181",
      "sameAs" : "http://posccaesar.org/rdl/RDS609012311"
    }, {
      "@id" : "rds:R63534165926",
      "rdsWipEquivalent" : "rdl:RDS608876181"
    } ],
    "@context" : {
      "hasDesignation" : "http://data.posccaesar.org/rdl/hasDesignation",
      "hasNote" : "http://data.posccaesar.org/rdl/hasNote",
      "hasCreator" : "http://data.posccaesar.org/rdl/hasCreator",
      "hasDefinition" : "http://data.posccaesar.org/rdl/hasDefinition",
      "label" : "http://www.w3.org/2000/01/rdf-schema#label",
      "hasIdPCA" : "http://data.posccaesar.org/rdl/hasIdPCA",
      "hasCreationDate" : "http://data.posccaesar.org/rdl/hasCreationDate",
      "hasStatus" : "http://data.posccaesar.org/rdl/hasStatus",
      "defaultRdsId" : "http://data.posccaesar.org/rdl/defaultRdsId",
      "hasDesignationAbbrev" : "http://data.posccaesar.org/rdl/hasDesignationAbbrev",
      "sameAs" : {
        "@id" : "http://www.w3.org/2002/07/owl#sameAs",
        "@type" : "@id"
      },
      "hasSuperclass" : {
        "@id" : "http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#hasSuperclass",
        "@type" : "@id"
      },
      "hasSubclass" : {
        "@id" : "http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#hasSubclass",
        "@type" : "@id"
      },
      "hasRegistrarAuth" : "http://data.posccaesar.org/rdl/hasRegistrarAuth",
      "hasRegistrar" : "http://data.posccaesar.org/rdl/hasRegistrar",
      "rdsWipEquivalent" : {
        "@id" : "http://data.posccaesar.org/rdl/rdsWipEquivalent",
        "@type" : "@id"
      },
      "rds" : "http://rdl.rdlfacade.org/data#",
      "p2" : "http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#",
      "owl" : "http://www.w3.org/2002/07/owl#",
      "rdf" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
      "afn" : "http://jena.hpl.hp.com/ARQ/function#",
      "xsd" : "http://www.w3.org/2001/XMLSchema#",
      "fn" : "http://www.w3.org/2005/xpath-functions#",
      "oldrdl" : "http://rds.posccaesar.org/2008/06/OWL/RDL#",
      "rdfs" : "http://www.w3.org/2000/01/rdf-schema#",
      "rdl" : "http://data.posccaesar.org/rdl/",
      "list" : "http://www.co-ode.org/ontologies/list.owl#",
      "dc" : "http://purl.org/dc/elements/1.1/"
    }
  }
  </code></pre>
  
  <p>Why is it null?</p>
  
  <p>Because of cookies or login information in the web browser?</p>