Several ways to parse JSON in C #

To become a master of the sea, you must know the true name of every drop of water in the sea.

At first I just wanted to find a way to convert the JSON array, which turned out to be a bunch of MSDN.

The search process inevitably comes across a whole bunch of nouns: WCF = DataContract = DataMember = DataContractJsonSerializer, and then the namespace is constantly introduced.

This experience immediately reminds me of the words of a sorcerer in a novel that is quoted above. Static language is a bit of a freak-out, ready to go, and then it's possible to start working.

Contrast

. Several common parsing JSON methods under net

Main class	name Space	Limit	built-in LINQ support
DataContractJsonSerializer	System.Runtime.Serialization.Json	General	Whether
JavaScriptSerializer	System.Web.Script.Serialization	Can only be used in a Web environment	Whether
Jsonarray, Jsonobject, Jsonvalue	System.json	Can only be used in Silverlight	Is
JsonConvert, Jarray, Jobject, Jvalue, Jproperty	Newtonsoft.json	General	Is

Preparing data

Entity class:

[DataContract]PublicClass Person {[DataMember (Order =0, isrequired =true)] public string Name { get; set;} [DataMember (Order = 1)] public int Age { get; set;} [DataMember (Order = 2)] public bool Alive { get; set;} [DataMember (Order = 3)] public string[] Favoritefilms { get; set;} [DataMember (Order = 4)] public person child { get; set;} } 

Defined:

Action<object> log = o => Console.WriteLine(o);Func<int, int, int> add = (x, y) => x + y;var p1 = new Person { Age = 12, Alive = true, Name = "lj", FavoriteFilms = new[] { "Up", "Avatar" }};var p2 = new Person() { Age = 28, Name = "cy", Child = p1 }; 

Using DataContractJsonSerializer

Help class:

  Using System.Runtime.Serialization.Json;///<summary>Parsing json, imitation JavaScript style///</summary>PublicStaticclass JSON {public static T parse<t> (string jsonstring) {using (var ms = new memorystream (Encoding.UTF8.GetBytes (jsonstring))) {return (T) new datacontractjsonserializer ( typeof (T)). ReadObject (MS); }} public static string stringify (object jsonobject) {using (var ms = new MemoryStream ()) {new datacontractjsonserializer (Jsonobject.gettype ()). WriteObject (MS, Jsonobject); return Encoding.UTF8.GetString (Ms. ToArray ()); } } } 

Usage:

    // 序列化    var jsonString = JSON.stringify(new[] { p1, p2 });    log(jsonString == JSON.stringify(new List<Person>() { p1, p2 }));   //true    log(jsonString);    // 反序列化，泛型集合    JSON.parse<List<Person>>(jsonString);    // 数组转换                JSON.parse<Person[]>(jsonString);

Output:

[{"Name":"LJ,""Age":12, "Alive": true, " Favoritefilms ": [" Avatar "]," child ": null},{ "Name":  "Cy",  "Age": 28, "Alive": false, Favoritefilms ": null," Age ": 12,true ,  "Favoritefilms": [ "Up",  "child": null}]           

Using JavaScriptSerializer

  // using System.Web.Script.Serialization;        var jser    = new JavaScriptSerializer();    var json    = jser.Serialize(new List<Person>() { p1, p2 }); var persons = jser.Deserialize<List<Person>>(json);

Using Silverlight

  Using System.jsonvar css ="{\" #header \ ": {background:\" red\ "}, Layout: [5,4,1],color:\" cyan\ "}";var style = Jsonobject.parse (CSS)As Jsonobject; (from SIn stylewhere s.key =  "color" select ( string) s.value). First (). ToString (); //"cyan" //more operations Style[ "layout" [ 0] = 22; var HD = Style[ "#header"]; Style[ "body>div+p"] = hd Style. Remove ( "#header"); var bd = new jsonobject (); Bd[ "border"] =  "1px solid cyan"; Style[ "body>div+p"][ "#meta"] = BD; style. ToString (); //{"Layout": [22,4,1], "color": "Cyan", "body>div+p": {"background": "Red", "#meta": {"border ":" 1px solid Cyan "}}}              

Using Json.NET

  // using Newtonsoft.Json;        var json = JsonConvert.SerializeObject(new[] { p1, p2 });    var persons = JsonConvert.DeserializeObject<List<Person>>(json); var ja = JArray.Parse(jsonString); log(ja);//注意，格式化过的输出

Output:

[  {"Name":"LJ,""Age":12,"Alive":true, "Favoritefilms": [ "Up", "Avatar"], "child": null}, { "Name": "Cy", "age": 
                  
                   28, 
                   "Alive": false, "Favoritefilms": null, "child": { "Name": "LJ", "age":  "Alive": True, "Favoritefilms": [ "Up", "Avatar"], "Child ": null}}] /c24> 
                  

Linq:

    var ageCount = ja.Select(j => (int)j["Age"]).Aggregate(add);        var q = from j in ja where !j["Name"].Value<string>().Equals("lj") select (int)j["Age"]; log(q.Aggregate(add) == ageCount); //false

Other:

  Nested constructors that resemble LINQ to XML:var Jo =New Jobject (New Jproperty ("Age", persons. Select (P = p.age)),New Jproperty ("Funny",True),New Jproperty (new jarray (new[] { 2, 4, 1})); Log (Jo); //jobject operation var css = var style = Jobject.parse (CSS); var bd = new jobject (); Bd[ "color"] = " 1px solid cyan "; Style[ "border"] = BD; var HD = Style[ "#header"]; Style[ "body>div+p"] = hd Hd.parent.remove (); Style[ "layout"][0] = 22; log (style);                

Output:

    {      "age": [        12,        28      ],      "funny": true, "array": [ 2, 4, 1 ] } { "layout": [ 22, 4, 1 ], "border": { "color": "1px solid cyan" }, "body>div+p": { "background": "red" } }

Several links:

Several ways to parse JSON in C #