Chapter 83:Using json.net

UsingJSON.netJsonConverterclass.

Section83.1:UsingJsonConverteronsimplevalues

Example using JsonCoverter to deserialize the runtime property from the api response into a TimespanObject in the Movies model

JSON(http://www.omdbapi.com/?i=tt1663662)

{

Title:”PacificRim”,

Year:”2013″,

Rated:”PG-13″,

Released:”12Jul2013″,

Runtime:”131min”,

Genre:”Action,Adventure,Sci-Fi”,

Director:”GuillermodelToro”,

Writer:”TravisBeacham(screenplay),GuillermodelToro(screenplay),TravisBeacham(story)”, Actors:”CharlieHunnam,DiegoKlattenhoff,IdrisElba,RinkoKikuchi”,

Plot:”As a war between humankind andmonstroussea creatures wages on, a formerpilotand a traineearepaireduptodriveaseeminglyobsoletespecialweaponinadesperateefforttosave theworldfromtheapocalypse.”,

Language:”English,Japanese,Cantonese,Mandarin”,

Country:”USA”,

Awards:”Nominatedfor1BAFTAFilmAward.Another6wins&46nominations.”, Poster:

“https://images-na.ssl-images-amazon.com/images/M/MV5BMTY3MTI5NjQ4Nl5BMl5BanBnXkFtZTcwOTU1OTU0OQ@@.

_V1_SX300.jpg”,

Ratings:[{

Source:”InternetMovieDatabase”,

Value:”7.0/10″

},

{

Source:”RottenTomatoes”,

Value:”71%”

},

{

Source:”Metacritic”,

Value:”64/100″

}

],

Metascore:”64″,

imdbRating:”7.0″,

imdbVotes:”398,198″,

imdbID:”tt1663662″,

Type:”movie”,

DVD:”15Oct2013″,

BoxOffice:”$101,785,482.00″,

Production:”WarnerBros.Pictures”,

Website:”http://pacificrimmovie.com”,

Response:”True”

}

MovieModel

usingProject.Serializers;

usingNewtonsoft.Json;

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Runtime.Serialization;

usingSystem.Threading.Tasks;

namespaceProject.Models

{

[DataContract] public

class Movie

{

publicMovie(){}

[DataMember]

publicintId{get;set;}

[DataMember]

publicstringImdbId{get;set;}

[DataMember]

publicstringTitle{get;set;}

[DataMember]

publicDateTimeReleased{get;set;}

[DataMember] [JsonConverter(typeof(RuntimeSerializer))]

publicTimeSpanRuntime{get;set;}

}

}

RuntimeSerializer

usingNewtonsoft.Json;

usingNewtonsoft.Json.Linq;

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text.RegularExpressions;

usingSystem.Threading.Tasks;

namespaceProject.Serializers

{

publicclassRuntimeSerializer:JsonConverter

{

publicoverrideboolCanConvert(TypeobjectType)

{

returnobjectType==typeof(TimeSpan);

}

public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializerserializer)

{

if (reader.TokenType == JsonToken.Null) return null;

JTokenjt=JToken.Load(reader);

Stringvalue=jt.Value<String>();

Regexrx=newRegex(“(\\s*)min$”);

value=rx.Replace(value,(m)=>””);

inttimespanMin;

if(!Int32.TryParse(value,outtimespanMin))

{

thrownewNotSupportedException();

}

returnnewTimeSpan(0,timespanMin,0);

}

publicoverridevoidWriteJson(JsonWriterwriter,objectvalue,JsonSerializerserializer)

{

serializer.Serialize(writer,value);

}

}

}

CallingIt

Moviem=JsonConvert.DeserializeObject<Movie>(apiResponse));

Section83.2:CollectallfieldsofJSONobject

usingNewtonsoft.Json.Linq;usingSystem.

Collections.Generic;

publicclassJsonFieldsCollector

{

privatereadonlyDictionary<string,JValue>fields;

publicJsonFieldsCollector(JTokentoken)

{

fields=newDictionary<string,JValue>(); CollectFields(token);

}

privatevoidCollectFields(JTokenjToken)

{

switch(jToken.Type)

{

caseJTokenType.Object:

foreach(varchildinjToken.Children<JProperty>())

CollectFields(child);

break;

caseJTokenType.Array:

foreach(varchildinjToken.Children())

CollectFields(child);

break;

caseJTokenType.Property:

CollectFields(((JProperty)jToken).Value);

break;

default:

fields.Add(jToken.Path,(JValue)jToken); break;

}

}

publicIEnumerable<KeyValuePair<string,JValue>>GetAllFields()=>fields;

}

Usage:

varjson=JToken.Parse(/*JSONstring*/);

varfieldsCollector=newJsonFieldsCollector(json);

varfields=fieldsCollector.GetAllFields();

foreach(varfieldinfields)

Console.WriteLine($”{field.Key}:'{field.Value}'”);

Demo

ForthisJSONobject

{

“User”:”John”,

“Workdays”:{

“Monday”:true,

“Tuesday”:true,

“Friday”:false

},

“Age”:42

}

expectedoutputwillbe:

User: ‘John’

Workdays.Monday: ‘True’

Workdays.Tuesday:’True’

Workdays.Friday:’False’

Age: ’42’