How can I parse JSON with C

Question

I have the following code   var user    Dictionary lt string  object gt  serializer DeserializeObject responsecontent     The input in responsecontent is JSON  but it is not properly parsed into an object  How should I properly deserialize it

User · Answer

Use this tool to generate a class based in your json:

http://json2csharp.com/

And then use the class to deserialize your json. Example:

public class Account
{
    public string Email { get; set; }
    public bool Active { get; set; }
    public DateTime CreatedDate { get; set; }
    public IList<string> Roles { get; set; }
}


string json = @"{
  'Email': '[email protected]',
  'Active': true,
  'CreatedDate': '2013-01-20T00:00:00Z',
  'Roles': [
    'User',
    'Admin'
  ]
}";

Account account = JsonConvert.DeserializeObject<Account>(json);

Console.WriteLine(account.Email);
// [email protected]

References: https://forums.asp.net/t/1992996.aspx?Nested+Json+Deserialization+to+C+object+and+using+that+object https://www.newtonsoft.com/json/help/html/DeserializeObject.htm

User · Answer

You could also have a look at the DataContractJsonSerializer

User · Answer

Try the following code   HttpWebRequest request    HttpWebRequest WebRequest Create  URL    JArray array   new JArray    using  var twitpicResponse    HttpWebResponse request GetResponse    using  var reader   new StreamReader twitpicResponse GetResponseStream           JavaScriptSerializer js   new JavaScriptSerializer        var objText   reader ReadToEnd         JObject joResponse   JObject Parse objText       JObject result    JObject joResponse  result        array    JArray result  Detail        string statu   array 0   dlrStat   ToString

User · Answer

using  var ms   new MemoryStream Encoding Unicode GetBytes user              Deserialization from JSON       DataContractJsonSerializer deserializer   new DataContractJsonSerializer typeof UserListing       DataContractJsonSerializer typeof UserListing        UserListing response    UserListing deserializer ReadObject ms         public class UserListing        public List lt UserList gt  users   get  set               public class UserList        public string FirstName   get  set               public string LastName   get  set

User · Answer

System Text Json   NET core 3 0 comes with System Text Json built-in which means you can deserialize serialize JSON without using a third-party library     To serialize your class es  to JSON string   var json   JsonSerializer Serialize order     To deserialize the JSON into a strongly typed class   var order   JsonSerializer Deserialize lt Order gt  json     So if you have a class like below   public class Order       public int Id   get  set        public string OrderNumber   get  set        public decimal Balance   get  set        public DateTime Opened   get  set       var json   JsonSerializer Serialize order      creates JSON    gt         id   123456       orderNumber    ABC-123-456        balance   9876 54       opened    2019-10-21T23 47 16 85       var order   JsonSerializer Deserialize lt Order gt  json         gt  creates the above class     One thing to note is that System Text Json does not automatically handle camelCase JSON properties when using your own code  however  it does when using MVC WebAPI requests and the model binder     To resolve this you need to pass JsonSerializerOptions as a parameter    JsonSerializerOptions options   new JsonSerializerOptions               PropertyNamingPolicy   JsonNamingPolicy CamelCase      set camelCase            WriteIndented   true                                   write pretty json        pass options to serializer var json   JsonSerializer Serialize order  options      pass options to deserializer var order   JsonSerializer Deserialize lt Order gt  json  options     System Text Json is also available for  Net Framework and  Net Standard as a Nu-get package System Text Json

User · Answer

You can use following extentions  public static class JsonExtensions       public static T ToObject lt T gt  this string jsonText                return JsonConvert DeserializeObject lt T gt  jsonText              public static string ToJson lt T gt  this T obj                return JsonConvert SerializeObject obj

User · Answer

string json                    Name    Wide Web                Url    www wideweb com br              JavaScriptSerializer jsonSerializer   new JavaScriptSerializer            dynamic j   jsonSerializer Deserialize lt dynamic gt  json           string name   j  Name   ToString            string url   j  Url   ToString

User · Answer

Another native solution to this  which doesn t require any 3rd party libraries but a reference to System Web Extensions is the JavaScriptSerializer  This is not a new but a very unknown built-in features there since 3 5   using System Web Script Serialization        JavaScriptSerializer serializer   new JavaScriptSerializer    objectString   serializer Serialize new MyObject       and back  MyObject o   serializer Deserialize lt MyObject gt  objectString

User · Answer

System Json works now     Install nuget https   www nuget org packages System Json  PM gt  Install-Package System Json -Version 4 5 0   Sample      PM gt Install-Package System Json -Version 4 5 0  using System  using System Json   namespace NetCoreTestConsoleApp       class Program               static void Main string   args                           Note that JSON keys are case sensitive  a is not same as A                  JSON Sample             string jsonString       a    1   b      string value     c       Value    1      Value    2   SubObject       SubValue   3                        You can use the following line in a beautifier JSON formatted for better view                  a   1  b    string value   c     Value   1     Value   2  SubObject     SubValue  3                      Formatted jsonString for viewing purposes                                a  1                  b   string value                   c                                              Value  1                                                                Value  2                        SubObject                                                          SubValue  3                                                                                                                                    Verify your JSON if you get any errors here             JsonValue json   JsonValue Parse jsonString                   int test             if  json ContainsKey  a                                  int a   json  a       type already set to int                 Console WriteLine  json   a               a                                 string test             if  json ContainsKey  b                                  string b   json  b        type already set to string                 Console WriteLine  json   b               b                                 object array test             if  json ContainsKey  c    amp  amp  json  c   JsonType    JsonType Array                                   foreach loop test                 foreach  JsonValue j in json  c                                          Console WriteLine  j   Value               j  Value   ToString                                           multi level key test                 Console WriteLine  json   c    0    Value               json  c   0   Value   ToString                     Console WriteLine  json   c    0    Value               json  c   1   Value   ToString                     Console WriteLine  json   c    1    SubObject    0    SubValue               json  c   1   SubObject   0   SubValue   ToString                                Console WriteLine                Console Write  Press any key to exit                 Console ReadKey

User · Answer

I am assuming you are not using Json NET  Newtonsoft Json NuGet package   If this the case  then you should try it  It has the following features   LINQ to JSON The JsonSerializer for quickly converting your  NET objects to JSON and back again Json NET can optionally produce well formatted  indented JSON for debugging or display Attributes like JsonIgnore and JsonProperty can be added to a class to customize how a class is serialized Ability to convert JSON to and from XML Supports multiple platforms   NET  Silverlight and the Compact Framework  Look at the example below  In this example  JsonConvert class is used to convert an object to and from JSON  It has two static methods for this purpose  They are SerializeObject Object obj  and DeserializeObject lt T gt  String json   Product product   new Product    product Name    quot Apple quot   product Expiry   new DateTime 2008  12  28   product Price   3 99M  product Sizes   new string      quot Small quot    quot Medium quot    quot Large quot      string json   JsonConvert SerializeObject product            quot Name quot    quot Apple quot        quot Expiry quot    quot 2008-12-28T00 00 00 quot        quot Price quot   3 99       quot Sizes quot            quot Small quot          quot Medium quot          quot Large quot             Product deserializedProduct   JsonConvert DeserializeObject lt Product gt  json

User · Answer

Here are some options without using third party libraries      For that you will need to add reference to System Runtime Serialization var jsonReader   JsonReaderWriterFactory CreateJsonReader Encoding UTF8 GetBytes       Name      Jon Smith      Address        City      New York      State      NY        Age    42      new System Xml XmlDictionaryReaderQuotas         For that you will need to add reference to System Xml and System Xml Linq var root   XElement Load jsonReader   Console WriteLine root XPathSelectElement    Name   Value   Console WriteLine root XPathSelectElement    Address State   Value       For that you will need to add reference to System Web Helpers dynamic json   System Web Helpers Json Decode       Name      Jon Smith      Address        City      New York      State      NY        Age    42      Console WriteLine json Name   Console WriteLine json Address State     See the link for more information about System Web Helpers Json   Update  Nowadays the easiest way to get the Web Helpers is to use the NuGet package     If you don t care about earlier windows versions you can use the classes of the Windows Data Json namespace      minimum supported version  Win 8 JsonObject root   Windows Data Json JsonValue Parse jsonString  GetObject    Console WriteLine root  Name   GetString     Console WriteLine root  Address   GetObject    State   GetString

User · Answer

If JSON is dynamic as below     quot Items quot               quot Name quot    quot Apple quot            quot Price quot   12 3                       quot Name quot    quot Grape quot            quot Price quot   3 21                 quot Date quot    quot 21 11 2010 quot     Then  Once you install NewtonSoft Json from NuGet  and include it in your project  you can serialize it as string jsonString    quot    quot Items  quot       quot Name  quot     quot Apple  quot    quot Price  quot   12 3     quot Name  quot     quot Grape  quot    quot Price  quot   3 21     quot Date  quot     quot 21 11 2010  quot   quot            dynamic DynamicData   JsonConvert DeserializeObject jsonString            Console WriteLine    DynamicData Date       quot 21 11 2010 quot          Console WriteLine DynamicData Items Count      2         Console WriteLine DynamicData Items 0  Name       quot Apple quot   Source  How to read JSON data in C   Example using Console app  amp  ASP NET MVC

User · Answer

The following from the msdn site should I think help provide some native functionality for what you are looking for  Please note it is specified for Windows 8  One such example from the site is listed below   JsonValue jsonValue   JsonValue Parse     Width    800    Height    600    Title      View from 15th Floor      IDs     116  943  234  38793      double width   jsonValue GetObject   GetNamedNumber  Width    double height   jsonValue GetObject   GetNamedNumber  Height    string title   jsonValue GetObject   GetNamedString  Title    JsonArray ids   jsonValue GetObject   GetNamedArray  IDs      It utilizes the Windows Data JSON namespace

User · Answer

I think the best answer that I ve seen has been  MD Sayem Ahmed   Your question is  How can I parse Json with C    but it seems like you are wanting to decode Json   If you are wanting to decode it  Ahmed s answer is good   If you are trying to accomplish this in ASP NET Web Api  the easiest way is to create a data transfer object that holds the data you want to assign   public class MyDto      public string Name get  set       public string Value get  set       You have simply add the application json header to your request  if you are using Fiddler  for example   You would then use this in ASP NET Web API as follows     controller method -- assuming you want to post and return data public MyDto Post  FromBody  MyDto myDto      MyDto someDto   myDto       ASP NET automatically converts the data for you into this object      if you post a json object as follows         Name    SomeName          Value    SomeValue            do some stuff     This helped me a lot when I was working in my Web Api and made my life super easy

User · Answer

var result   controller ActioName objParams   IDictionary lt string  object gt  data    IDictionary lt string  object gt  new System Web Routing RouteValueDictionary result Data   Assert AreEqual  Table already exists    data  Message

User · Answer

As was answered here - Deserialize JSON into C  dynamic object   It s pretty simple using Json NET   dynamic stuff   JsonConvert DeserializeObject     Name    Jon Smith    Address      City    New York    State    NY      Age   42       string name   stuff Name  string address   stuff Address City    Or using Newtonsoft Json Linq    dynamic stuff   JObject Parse     Name    Jon Smith    Address      City    New York    State    NY      Age   42       string name   stuff Name  string address   stuff Address City

User · Answer

If  NET 4 is available to you  check out  http   visitmix com writings the-rise-of-json  archive org   Here is a snippet from that site   WebClient webClient   new WebClient    dynamic result   JsonValue Parse webClient DownloadString  https   api foursquare com v2 users self oauth token XXXXXXX     Console WriteLine result response user firstName     That last Console WriteLine is pretty sweet

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